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Check Engine Light

The check engine light comes on in a car when the engine is experiencing a problem. Ask questions here about your car's check engine light.

7,238 Questions

How do I set up a phone in a 2003 Jaguar X type?

you would either have to buy a parrot if your phone is not the jaguar one. If you buy the proper jaguar phone it just plugs in under the arm rest.

Check engine light wont go off?

The light is one because there is a problem with the emissions system. Once the problem is corrected the service tech will reset the light.

How many miles to reset check engine?

It is driving cycles not miles. It varies from manufacture to manufacture.

What do engine codes P0153 P0171 P0304 P0401 have in common on a ford 4.0?

P0153 02 Sensor Circuit Slow Response (Bank 2 Sensor 1) P0171 System too Lean (Bank 1 P0304 Cylinder 4 Misfire Detected P0401 Exhaust Gas Recirculation Flow Insufficient Detected

What could be wrong with a 2000 Lincoln LS if the engine light on the dash will not go off?

To find out what is wrong with it you will have to take it to a repair shop or the ford dealer with a computer to hook it up, but the engine light being on something is wrong with the car, it kinda sounds like a ingition coil pack going out, if so it will only get worse and could also be many other little things, but it must be repaired before the light will go off, and needs to be repairs ASAP so it doesnt cause anymore damage, that is why the light came on is for it to be serviced and repairs ASAP.

I have the same problem with a 2001 LS V8 sport. They diagnosed this earlier this year when I felt a subtle pulsing in the car during heavy acceleration. They said they must change both according to Lincoln service number SSM 512 481 091 and replace BOTH pumps (which shocked me to find there was two). They listed the pumps as YW42-9275-BC and YW42-9H307-BA. Apparently these cross reference to part number E2274M from Airtex but I'll know more soon as it is on order from my local jobber. I do know that if you order a 'pump' from A/C number MU2013 you will get a sender unit only which is listed improperly (and probably why the Airtex costs about 25% more). One other item the dealer replaced on my LS was the Idle solonoid but that shouldn't impact the car while driving, just while idling.

Why would the check engine light go out without making a repair?

Basically it means that you have experienced an intermittent emission control system failure. It failed to work properly for some time, then it began working again. Explanations range from a temporary issue caused by wet or dirty wiring harness plugs that may never give you a problem again, to a component that is slowly failing and will definitely have to be replaced, eventually.

For an explanation of how this can happen, see below:

The check engine light illuminates when an emission control device has failed a computerized self test. Such tests vary by year and by car, but they are basic operational tests that occur all the time your vehicle is in operation.

During vehicle operation, the ECM (electronic control module) reads a series of sensors (temperature, pressure, flow, position, etc) and controls a series of effectors (valves, switches, solenoids, etc). If the ECM turns on a solenoid to effect a change in exhaust gas recirculation, it will watch the exhaust gas recirculation flow sensor to see if the change actually created more or less flow. If it does not, it may reset the solenoid and try it several more times. But eventually, if the effector (switch, solenoid) does not cause a change in the reading of a sensor, the ECM will mark the circuit as defective, set a service code(s), and illuminate the check engine light.

Additionally, the ECM will occasionally retest any circuit marked defective. If that circuit works properly during the restes, it will mark the circuit as good and turn off the check engine light. These retests occur when you first start your engine, but may also happen while you are driving. The newer the vehicle, the more sophisticated and smarter the ECM is.

How long do you have to wait to get a smog inspection after resetting the check engine light on a PT Cruiser?

Drive the vehicle for 5 full driving cycles and if the light stays off you are ok and can pass inspection.

How do you reset the engine light on 2000 beetle?

Take the battery cables off for 20 minutes. This hold true on all makes and models on all cars. But this does not fix your problem that made your engine light to come on in the first place. You must first make sure that is taken care of first.

What would cause check engine light come on after getting oil and oil filter and air filter changed?

None of these maintenance items will trigger the check engine light. The light is on because the computer has detected a problem with the emission system. Have the ECU scanned and retrieve the code. This code will tell you what part is being effected but not necessarily the defective part.

How do you fix speedometer or instrument panel for Nissan terrano II 2.7 dt 2000 model?

Nissan dealers have no parts for this model and you have to repair it and it will cost you arounf £150.00

Why would the check engine light come on for a 2002 Hyundai Santa Fe?

Could be something as simple as your gas cap not being tightened. You need to put the gas cap on and tighten it at least 3 clicks.

Can you return a vehicle if owned less than 30 days because service lights are appearing TX?

You can return it for service, but unless you were given an express warranty (in that the dealer lied to you about the vehicle) you can't bring it back for good.

How do you reset the service engine soon light on a 2007 galant?

When having a car inspected it is important that the Service Engine Soon light is not on. To reset the light a person can disconnect the battery, then reconnect it after 30 minutes or so, it can also be cleared with an OBDii scanner.

How do you reset check engine light on a 1996 Nissan altima?

Your best best is to got to your local auto parts store. Auto Zone and O'Reilly both have OBDII Scanners to ID the reason the light is on, then you can clear the codes to turn the light off.

How to turn off an Engine warning light on a Mazda 323?

You can reset the on board diagnostic computer by disconnecting the battery however if you did not fix the emissions problem it will come back on after driving for a short time. Depending on the faulty component it could light up after a few minutes or a few days

Why would the engine light be on in a 2001 Toyota Sienna if the fluids are topped up?

The check engine light does not indicate your fluids are low. There are separate lights for that. The MIL (or check engine light) indicates there is a problem with your fuel injection, ignition, emmisions or engine and a DTC (or diagnostic trouble code) has been stored. Your best bet is to pull the codes to find out why the light is on. This is the only way you will correctly identify and fix the problem.