Articles on Technology, Health, and Travel

Cat c15 bad cam sensor symptoms of Technology

It also makes an ominous mechanical clank/thud sound if I give.

Here are three common symptoms that the camshaft has failed in your C15 engine: Poor Performance If you're having problems with your camshaft, you might notice a decrease in your C15's performance. This can include stalls, rough idle, or slow acceleration.Aug 26, 2022 · A bumpy idle is mostly caused by the engine’s unsynchronized combustion cycles. This problem could be brought on by a bad camshaft sensor, EGR valve, or fuel pump. Regardless of the reason, finding the source of a rough idle can take some time. 10. Car Experiences Low Power Output. Of all sensors found on today's engines, few are as important as those which relate to engine timing. One such sensor is the Camshaft Position Sensor. This ...Jan 13, 2019 · If you measure the sensor resistance first, then plug the sensor back in and jump up to the the ecm plug, the same resistance should be read. If that reads ok, shake the harness while checking ohms and also check for a pin to pin short/ short to ground. Cat C15 Cam Sensor: Symptoms, Location, and Replacement | JustAnswer Ask an Expert Car Questions Heavy Equipment Repair C15: I need to replace the cam sensor and the crank sensor… Cat Man, Caterpillar Engine Expert 10,345 Satisfied Customers 23 Years Caterpillar Engine experience. Cat Man is online now Continue Related Heavy Equipment QuestionsAs far as mechanical problems, it could be a faulty oil pressure sensor, a bad oil pressure gauge, a blocked oil passage, a damaged oil pump relief valve or a dirty oil filter. Understanding all of the reasons helps you determine what might be wrong with your vehicle. 1. Cold Engine.In this video we are working on a subscriber's C15 engine that had various problems, but the main one was shaking under a heavy load on the engine. Can we fi...If you drive a relatively new car, there are usually a few sensors and cameras in place to help keep you safe. Here are the six major sensors on your car you should look for and keep clean of snow, ice, and dirt this winter. If you drive a ...SYMPTOMS OF BAD CAMSHAFT POSITION SENSOR ON DODGE CHARGER Dodge Parts here: https://amzn.to/3ovo5jR More Specific Parts Bellow If you have Dodge Charger an...Read on to find out its common symptoms, and possible fixes. Get 10% OFF ... When the OBD-II scanner shows a P0340 code that denotes a bad camshaft position sensor circuit, bring the affected vehicle ... Got a question I have 2016 chevy equinox LT I have replace cam senor and set the timing and now it is throwing codes p0340 and ...Cat C15 Acert Camshaft Problems, Broke Camshafts, Symptoms and Replacement. Highway and Heavy Parts. 12.1K subscribers. Subscribe. 1.7K views 3 years ago. Shop C15 Acert Camshafts at HHP! 2500740 ...Sep 14, 2023 · P0016 code stands for Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor A). This indicates that the engine timing is having problems resulting from the misalignment in the crankshaft and camshaft positions. Bank 1: Means that the problem is on the engine side containing cylinder 1. Sensor A: Indicates that the issue is ... The average boost pressure sensor replacement cost is between $175 and $200. However, this cost can vary depending on the vehicle you drive and where you take it for repairs. If you’re looking to replace this sensor yourself to save a little money, you can, but most of the cost is in parts, not labor. The average boost pressure sensor costs ...C15 has slight skip when climbing. Did it only once last night but three times today. Just a quick skip then runs fine. All of a sudden, now it skips under a load ( going up hill) very noticeable. Would this be cam sensor going bad. Had a 3406 that did this a few years ago. Symptoms same. Your thoughts?Apr 29, 2012 · C15 has slight skip when climbing. Did it only once last night but three times today. Just a quick skip then runs fine. All of a sudden, now it skips under a load ( going up hill) very noticeable. Would this be cam sensor going bad. Had a 3406 that did this a few years ago. Symptoms same. Your thoughts? 1. Vehicle does not drive like it used to. If your vehicle idles roughly, stalls frequently, has a drop in engine power, stumbles frequently, has reduced gas mileage, or accelerates slowly, these ...22-11 Cam Sensor to Crank Sensor Calibration 42 110-11 Very High Coolant Temp Warning 61 22-13 Check Timing Sensor Calibration 42 111-01 Low Coolant Level Warning 62 30-08 Invalid PTO Throttle Signal 29 111-02 Coolant Level Sensor Fault 12P0016 code stands for Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor A). This indicates that the engine timing is having problems resulting from the misalignment in the crankshaft and camshaft positions. Bank 1: Means that the problem is on the engine side containing cylinder 1. Sensor A: Indicates that the issue is ...By Liam Plunket 1 July 2023. On to the point; The crankshaft position sensor on a Cat C15 engine is located on the front side of the engine block, near the crankshaft pulley or harmonic balancer. The Cat C15 engine is a powerful and widely used engine in heavy-duty applications. Among its many vital components is the crank sensor, which plays a ...20 ott 2020 ... Monitor the “Engine Starting” screen in Cat ET. B. Crank the engine for 5 seconds. While the engine is cranking, verify that the sensors show an ...Jan 21, 2021 · 3. Steering Wheel Position Sensor Symptoms of a Bad Steering Wheel Position Sensor . Check engine light for code C0455; Different warning lights; Causes of a Bad Steering Wheel Position Sensor. A defective wheel position sensor has to do with the angle of the steering wheel position. There may be an electrical circuit issue, but usually it’s ... Step 1: Turn the car on. Turn the key to the second (ON) position for this test. You want battery power flowing, but don’t want the engine running. Step 2: Set up DVOM to measure DC voltage. Use the lowest range possible if the meter doesn’t auto range. Step 3: Touch the negative lead of the DVOM to a ground source.If you're buying a second-hand DSLR camera (or you just want to check the sensor of your current camera), CNET suggests a neat trick to identify dust or dead pixels: point it at the sky and take a photo. If you're buying a second-hand DSLR ...Transmission Troubles As previously discussed, the camshaft and crankshaft sensors provide power to the transmission. So, people will likely notice transmission …Mar 23, 2011 · Crank and cam sensor c15 acert. What are symptoms of these sensors goin bad,when replacing crank sensor does it need to be calibrated? In this video, you will learn 8 symptoms of a bad manifold absolute pressure sensor (MAP SENSOR). Watching this video will help you diagnose to see if it's t...CAT C15 Oil Pump Problems, Failure Modes, SymptomsShop CAT C15 Oil Pumps at HHP! https://highwayandheavyparts.com/search.html?q=c15+oil+pumps&go=GoRob from ...False readings. One way to know your oil temperature sensor is failing is if you get false readings due to the electrical signal output by the temperature sensor. These are indicated by the temperature gauge going from cool to hot in one minute. It takes a couple of minutes for the oil to heat up, so the temperature sensor should reflect that.1. Vehicle does not drive like it used to. If your vehicle idles roughly, stalls frequently, has a drop in engine power, stumbles frequently, has reduced gas mileage, or accelerates slowly, these ...Jan 13, 2019 · If you measure the sensor resistance first, then plug the sensor back in and jump up to the the ecm plug, the same resistance should be read. If that reads ok, shake the harness while checking ohms and also check for a pin to pin short/ short to ground. Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST. 1 (855) 347-2779 · [email protected]. Read FAQ. GET A QUOTE. Common signs include oil or coolant leaking from the oil cooler, oil getting in the cooling system, and coolant getting in the oil.First, set your multimeter to about 100 or 200 hertz. Unplug the vacuum hose from the sensor and plug in a hand-held vacuum pump to the sensor's vacuum port. Backprobe the signal and ground wires at the sensor electrical connector. Turn the ignition key to the On position but don't start the engine.Nov 11, 2022 · Camshaft Sensor Symptoms #2: Stalling. The engine may stall if the fuel injectors do not supply the right amount. Camshaft Sensor Symptoms #3: Rough Idling. A malfunctioning camshaft position sensor may be to blame for a harsh idle engine. When the engine is idling, this problem is more noticeable. Camshaft Sensor Symptoms #4: Hesitation In this video we are working on a subscriber's C15 engine that had various problems, but the main one was shaking under a heavy load on the engine. Can we fi...Nov 10, 2022 · 1. Check Engine Light. The appearance of a check engine light is the most typical sign of a faulty camshaft position sensor. As usual, it will be difficult to identify the issue until the light turns on. You should use an OBD2 scanner to check your automobile for any problem codes in order to gain a clearer picture. This is all best left to a professional mechanic who can provide you with a diagnosis, and then install the correct replacement part. Here are some common symptoms of a bad or failing throttle position sensor to watch for: 1. Car won’t accelerate, lacks power when accelerating, or accelerates itself. It may feel as though the car simply doesn ...But on average, replacement cost should be in the range of $100 to $220 in most cases (including labor). The oil pressure sensor itself can cost between $30 and $100, while labor costs can range from $70 to $120. However, the cost of parts can vary depending on whether you choose aftermarket or OEM (Original Equipment …If you drive a relatively new car, there are usually a few sensors and cameras in place to help keep you safe. Here are the six major sensors on your car you should look for and keep clean of snow, ice, and dirt this winter. If you drive a ...Step 1. Remove Camshaft Sensor: Locate the sensor by inspecting the front, rear and top portion of the engine. These sensors are in pain sight and will have a two or three wire connector attached to them. Use a small flat blade (standard) screwdriver or pick to release the electrical connector tab to remove connector from the sensor. Gently ...1. Check Engine Light. The appearance of a check engine light is the most typical sign of a faulty camshaft position sensor. As usual, it will be difficult to identify the issue until the light turns on. You should use an OBD2 scanner to check your automobile for any problem codes in order to gain a clearer picture.October 20, 2020 C13, C15, and C18 Engines Troubleshooting – Speed Control – Test System Operation Description: Use this procedure to troubleshoot the electrical system if …JTECH diesel technologyTO ECM MOUNTING BOLT. C-10, C-12, 3406E, C-15, and C-16 OEM VEHICLE HARNESS WIRING DIAGRAM. CIRCUITS WITHIN THIS AREA ARE RECOMMENDATIONS N/O RELAY TO VEHICLE COMPONENTS B OFF C ON S START R CHECK ENGINE LAMP WARNING LAMP L994-YL 659-PK L994-YL 659-PK K998-BU …C15 ACERT Camshaft Failure Symptoms. If you're experiencing a camshaft failure in your C15 ACERT, you might notice: Decrease in Driving Performance; Check Engine Light; …What are symptoms of these sensors goin bad,HARD START when replacing crank sensor WHEN IS A CODE does it need to be calibrated? YES2. Locate the camshaft sensor. You may need to take off the engine cover if it has one. Then, find the camshaft sensor either at the timing cover, on the cylinder head, or on the side of the engine block. It will be mounted near the top, and will have a wiring connector attached to it. There could be two, three, or four wires in the connector. 3.Thanks again to EVERYONE who has helped me with your knowledge and expertise over the last few years, especially lately! I posted a while back about a misfire immediately after my out of frame overhaul on this 5EK, which turned out to be a timing calibration issue since the engine was entirely disassembled.This is usually done when the engine is overhauled. If your fault has been fixed (replaced sensor) then the Diagnostic Code should change from Active to Logged. Logged Codes will not affect engine performance. However your sensor fault may have caused what's known as an FMI 13 Code.Top 5 Bad Camshaft Position Sensor Symptoms. ... My dad had his mechanic hook his computer to it it read 2 Cam sensors A-B, Crankshaft code, o2 sensor.. He seems to think its the timing chain it somehow got stretched the car just hit 100000 miles last week I get my oil changed every 3000 miles.So yesterday I joined the Evo community by purchasing a 2008 Evo it has 103k miles on it. The car turns over but wont start, it is throwing codes for the crank shaft sensor and camshaft sensor. I wondering if possibly one of the two needs to be replaced causing the other to throw a code. The owner said the chain was tightened at 60k miles …The biggest problem with the C15 design is the head gasket. But the issue is with the engine block design itself, not the head gasket. The fire rings tend to blow out because of the way the liners and the cylinders are constructed. The liners on the C15 sit in the engine block, similar to a C13. However, the liner rests on the block, as opposed ...105th BLOWN HD. I would agree in that if you cannot do the work yourself , not worth the money. 2004 - 2008 Ford F150 - 2004 5.4l crazy cam sensor code problem - Hello, I have a 2004 f150 5.4l. 155k miles. The truck has always been reliable until it wasn't..I started my truck one morning and all of the sudden is was chugging and idling rough. Read on to find out its common symptoms,Bad Camshaft Position Sensor Symptoms #1 - Check Over time, the camshaft position sensor can fail, or b

Health Tips for Joann fabrics queensbury ny

Jan 5, 2016 · There are a few warning signs to watch out for befor.

The most common symptom of a bad or failing 5.7 hemi crankshaft position sensor is facing difficulties starting the vehicle or not being able to start at all. As the job of a crankshaft position sensor is to monitor the crankshaft’s speed and position, and other parameters, while starting the engine, it has a vital role to play.They are part of CAT version of EGR. They open the intake on the exhaust stroke to let exhaust back into the engine. The main big problem with the actuators is they break studs. Then they bang on the top of the head and scar it. In worst cases they can ruin the head. But you will be able to hear it first usually. It will run rough and miss.Caterpillar C15 Engine Parts water pumps & cOmpOnents Table 11: Water Pumps - New Part No. OEM No. Description UOM Qty. Per Engine SPQ Comment 1615719CAT 1615719 New Water Pump - Fits C15, 3406E EA 1 1 1615719CAT 1615719 New Water Pump - C15 - Dished Gear With Straight Teeth EA 1 1 1615719CAT 1615719 New Water Pump - C15 …P.S. P219A is DTC for fuel /air mixture issue ban Thank you, As you have indicated , and I have found out the approved fix is camshaft, cam followers, lifters, and I have requested the oil be changed already , so I should be in good shape, thank you P.S. 2019 Jl 4000 miles with bad camshaft, disappointing, .....concerned of other issues which ...Checking the oil regularly is one of the easiest ways to help ensure that future issues such as camshaft pitting on your Cat C15 engine are averted. Changing the oil as per the manufacturer's recommendation will also help ensure that further damage is prevented. Even with taking the mentioned preventative steps mentioned above, pitting could ...If you find that the camshaft sensor is bad, it is often quite cheap to replace it. You can expect to pay around $50 to $200 for the sensor itself, and the sensor is often replaced within 30 minutes. Therefore, you can expect a total replacement cost of $80 to $300 for a camshaft sensor replacement on most vehicles.Step 1 – Disconnect both negative battery cables. Step 2 – Remove the electrical 7.3 ICP pigtail connector from your ICP sensor. There’s a retaining clip that you need to lift up and pull up and away from the …Is the Cat C15 A Good Motor? The Caterpillar C15 engine is known to be a good and reliable engine. It's a very popular engine for a reason, and they're a consistent seller for us. The C15 was made to improve on the 3406E. One of the key improvements is that C15 engines see oil leakage less frequently than the 3406E. Caterpillar C15 Engine ...If you're buying a second-hand DSLR camera (or you just want to check the sensor of your current camera), CNET suggests a neat trick to identify dust or dead pixels: point it at the sky and take a photo. If you're buying a second-hand DSLR ...Poor Fuel Economy. Poor fuel economy is another symptom that indicates your coolant temperature sensor is malfunctioning. If the coolant temperature sensor malfunctions, it can transmit a false signal to the computer. And the response of the computer may unbalance the timing and fuel calculations. It is also common for a coolant temperature ...In this post we're covering common symptoms of Caterpillar C15 ACERT oil pump failure. As well as what causes the failures to occur so you can prevent them! Log In. 844.215.3406. Toggle navigation. Login: ... There are subtle, but noticeable changes to your Cat C15 ACERT diesel engine that should trigger warning bells in your mind.Mar 5, 2008 · They might have had to get it running for the recall to be performed. If not, go in and talk to the service manager and tell him you never gave them permission to repair the truck. It was the cam shaft postion sensor recall that I thought was the problem. Thats what I said to fix. We've noted before that more megapixels don't mean a better camera; a better indicator of photo quality from a camera is its sensor size. The Sensor-Size app helps you compare popular cameras' sensor sizes and also convert unfriendly ratios...On average, expect to spend $100 to $250 to have the camshaft position sensor replaced. The parts may cost $75 to $125, while the labor makes up $25 to $125. The total cost depends on the make and model of your vehicle, as well as local labor rates . If you plan to change the camshaft position sensor yourself, it’s not a difficult job.Shake the IAT sensor connection to the mass air flow sensor, and check to see if there is any difference in reading. A change in the reading indicates a bad connector, which then has to be replaced. If the temperature reading displays -30 to -40°F, the dashboard light should show the code P0113, and if the reading displays 300°F, the ...The most common symptom of a bad VVT solenoid or oil control valve is a check engine light on your dashboard. You may also notice issues with the performance, like rough idle, rough acceleration, increased fuel consumption, or low engine power. 1.Reference sensor : Atmospheric Pressure Sensor: 101-13: 101-13: Crankcase Air Pressure Sensor : Out of Calibration: During key on, the signal voltage from the crankcase air pressure sensor indicated a crankcase air pressure greater than +/-1.5 kPa (0.2 psi). There is not a reference sensor for this sensor: 274-13: 108-13In either case, it should be checked out as soon as possible. 7. Overheating. Possibly one of the most noticeable signs of a damaged or failing cylinder head on your Cat C15 diesel engine is that it overheats. If this happens, pull over immediately to prevent any further damage from occurring.Caterpillar C15 Common Camshaft Failure Symptoms. At their core, camshafts are all the same. Sure, some manufacturers will have a slightly different or offer a more aggressive lobe, but they all do the same thing. Therefore, camshaft failure symptoms are largely the same. Here are the top three warning signs to watch out for. Poor PerformanceThe biggest problem with the C15 design is the head gasket. But the issue is with the engine block design itself, not the head gasket. The fire rings tend to blow out because of the way the liners and the cylinders are constructed. The liners on the C15 sit in the engine block, similar to a C13. However, the liner rests on the block, as opposed ...No a faulty sensor will only log a code of it is shorter or open. If it's reading wrong, it's an acceptable signal. For example. If boost is really 45 psi but the boost sensor is only telling the ECM 25. The ECM does not know its a bad signal. 25 is acceptable. It has nothing to verify the sensors reading.P0340 definition: Camshaft Position Sensor Circuit Malfunction. Issue Severity: SEVERE – Stop driving immediately. Repair Urgency: Fix this code immediately (same-day if possible) to avoid internal engine damage. Diagnosis: The vehicle may be difficult to start and the driver may also experience a lack of power when driving.Sep 17, 2021 · 1 What does a camshaft sensor do? 2 Symptoms of a bad camshaft position sensor. 2.1 An illuminated check engine light; 2.2 Starting difficulties and general poor drivability; 2.3 Poor fuel economy; 2.4 Problems with the transmission; 3 What causes a camshaft sensor to go bad? 3.1 Wear and tear; 3.2 Accidents; 3.3 Other causes If my boost pressure sensor on c15 acert is bad will it show on CAT ET. Some days it will randomly show 50# ***** only to realize it won't go below 10 at idle. First time this happened it was 6 degrees outside, I just assumed the bitter cold caused it. It has happened a few more times since then. I swear truck runs differently every time I ...Crankshaft Position Sensor Replacement Cost. The average crankshaft sensor replacement cost is between $150 and $250. However, it’s not uncommon for those prices to skyrocket if you have a higher-end vehicle. That’s because the labor costs are typically between $90 and $110.Cat C15 Cam Sensor: Symptoms, Location, and Replacement | JustAnswer Ask an Expert Car Questions Heavy Equipment Repair C15: I need to replace the cam …False readings. One way to know your oil temperature sensor is failing is if you get false readings due to the electrical signal output by the temperature sensor. These are indicated by the temperature gauge going from cool to hot in one minute. It takes a couple of minutes for the oil to heat up, so the temperature sensor should reflect that.2002 379 pete c15 6nz cat .engine will not sta13 lug 2012 ... Wit "speed sensors" you mean:

Top Travel Destinations in 2024

Top Travel Destinations - If you measure the sensor resistance

Oct 20, 2020 · 2. Check the Supply Voltage to the Sensor. A. Turn the keyswitch to the OFF position. B. Disconnect the harness connector for the throttle position sensor. C. Measure the voltage across terminal A (8 V supply) and terminal B (digital return) on the harness side of the connector. 7.5 VDC: Result: The supply voltage is above 7.5 VDC at the sensor ... Fuel injector symptoms bad, faulty, dirty, clogged, leaking. Old fuel .... Apr 11, 2020 — cat c15 injector solenoid replacement cat c15 bad injector symptoms cat c15 performance injectors cat c15 injector torque specs cat c15 .... C7 Cat Reman Injector $ 309.00 $ 295.00.Result: The suspect sensor supply active code remains active after all sensors on the sensor supply circuit have been checked. A failed wiring harness has …Tighten the camshaft cover bolts to 10 Y (89 lbin). 4. Replace the bank 2 camshaft cover and replace the camshaft cover gasket. 5. Reassemble the bank 2 camshaft cover. Tighten Tighten the camshaft cover bolts to 10 Y (89 lbin). 2011 Enclave, Malibu, Traverse, Acadia 1. Remove the bank 2 camshaft cover for servicing of the PCV system. Refer to ...Repair CAM – Speed Sensor CAT 3406E 5EK : Adventures in Trucking Series Conclusion. Understanding the sensor locations in Cat 3406E engines is crucial for ensuring optimal engine performance, reliability, and longevity. These sensors provide vital data to the ECM, enabling precise adjustments and efficient operation.Cat C15 Cam Sensor: Symptoms, Location, and Replacement | JustAnswer Ask an Expert Car Questions Heavy Equipment Repair C15: I need to replace the cam …3. Steering Wheel Position Sensor Symptoms of a Bad Steering Wheel Position Sensor . Check engine light for code C0455; Different warning lights; Causes of a Bad Steering Wheel Position Sensor. A defective wheel position sensor has to do with the angle of the steering wheel position. There may be an electrical circuit issue, but usually it’s ...Mar 1, 2022 · P0340 definition: Camshaft Position Sensor Circuit Malfunction. Issue Severity: SEVERE – Stop driving immediately. Repair Urgency: Fix this code immediately (same-day if possible) to avoid internal engine damage. Diagnosis: The vehicle may be difficult to start and the driver may also experience a lack of power when driving. 105th BLOWN HD. I would agree in that if you cannot do the work yourself , not worth the money. 2004 - 2008 Ford F150 - 2004 5.4l crazy cam sensor code problem - Hello, I have a 2004 f150 5.4l. 155k miles. The truck has always been reliable until it wasn't..I started my truck one morning and all of the sudden is was chugging and idling rough.What Are the Symptoms of a Bad or Failing Camshaft Position Sensor? 1. Check Engine Light Comes On 2. Poor Drivability 3. Transmission Shifting Problems 4. …When the OBD-II scanner shows a P0340 code that denotes a bad camshaft position sensor circuit, bring the affected vehicle to an auto repair shop as soon as possible. Otherwise, continuous operation will not only prove difficult because of poor engine performance from misfires, but it can eventually harm the engine.They are part of CAT version of EGR. They open the intake on the exhaust stroke to let exhaust back into the engine. The main big problem with the actuators is they break studs. Then they bang on the top of the head and scar it. In worst cases they can ruin the head. But you will be able to hear it first usually. It will run rough and miss.Step 1: Turn the car on. Turn the key to the second (ON) position for this test. You want battery power flowing, but don’t want the engine running. Step 2: Set up DVOM to measure DC voltage. Use the lowest range possible if the meter doesn’t auto range. Step 3: Touch the negative lead of the DVOM to a ground source.The average intake temperature sensor replacement cost is between $40 and $250, depending on the car model and labor costs. An intake temperature sensor costs $20 to $150, and the labor costs $20 to $100. If your intake temperature sensor is integrated into the MAF sensor, the part cost can increase rapidly.Jun 3, 2019 · Of course, these are symptoms for any number of other problems, too. 2. Check Engine Light comes on. The Check Engine Light will come on once the camshaft position sensor starts to go bad. Since ... Symptoms Of A Failing ACERT Oil Pump. There are three main symptoms of a failing oil pump on your C15 ACERT diesel engine. These include, but are not limited to: Low Oil Pressure . Low oil pressure can be caused by a variety of problems, including a blocked, seized, or damaged oil pump. Higher Operating TemperaturesCamshaft problems can spell major issues for your Caterpillar C15 ACERT. This component needs to be functioning at its best for optimal engine performance. The timing of camshaft operation must be precise in relation to the motion of the pistons. If one part is out of step, you could experience bigger problems in your diesel engine. Bad Camshaft Position Sensor Symptoms #1 - Check Engine L