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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

What causes service engine light to come on for a 2002 gmc envoy with 65000 miles?

This can be any number of things from bad spark plugs to catalytic converter, crank or cam sensors to map sensor. Have it scanned, find out what code is stored and that will tell you the problem.

What is p1280?

P1280 Injection Control Pressure Out Of Range

What is obd code p0443?

The P0443 code translates to: "Evaporative Emission Control System Purge Control Valve Circuit". To find more information on this code, go here: http://www.obd-codes.com/p0443 For a complete list of codes, go here: http://www.obd-codes.com/trouble_codes/

Can anyone help you have a vauxhall cavalier 20 16v engine management light started to flash and now wont start any ideas?

reset the ecu and it will start do this by disconnecting the battery and unplug the ecu and wait an half hour so the ecu can discharge then reconnect and it should start what you may find the the car has a service limit ie so many miles before service after that it goes in to limp mode and then all stop. its an old trick but it does work.

If it flasehes when you turn the ignition on, and continues to flash, then i know on my astra, this is the immobilizer kicking in. Try a different key. if not, see your local garage

if the light is flashing then the system is not finding the "chip" in the key, has the key been dropped and broken recently, is it a new key? if it has broken recently then look for what looks like a chip of dark coloured stone and refit into key if you cannot find this then a main dealer should keep them on the shelf, but you will need the vehicle security number.

As said above, a flashing "engine management light" during cranking means the immobilizer system in the car does not recognise the immobilizer chip in the key, or does not detect a chip at all. The chip is about 5mm long, 3 wide, and 2 deep. In other words "Freaking Tiny". It's very common for them to fall out of the key if dropped, or when the key is opened to change the bulb/battery in the "torch".

It's also possible that there has been a failure in either the Fuel injection system, or in the Immobiliser system, but it's more common for the chips to fall out of the keys, as the chips are so small, most people don't notice them on the ground when they drop the keys.

How much does it cost approximately in US dollars to fix a misfire in your cylinder?

Depends on the problem, it could mean anything from a new spark plug to needing a new cylinder head and anything inbetween.

What is the mostly cause of your 1992 Lexus LS400 showing a track off and check engine lights on dash?

I have heard a few different things mentioned. Check on lexusownersclub and post it in the LS400/430 catagory. A very good specialty site. vbd

Check engine light started blinking in 02 mercury marquis?

If your check engine light is blinking that means a cylinder misfire has been detected

Drive in a moderate fashion ( no fast acceleration / decelleration ) and have the

vehicle scanned for any trouble code(s) to diagnose and repair the problem

Check engine light code p0456 on a 2008 Kia?

From AutoZone on a 2008 Kia Sorento LX

"EVAP emission system - very small leak

Probable cause

1. Faulty fuel cap

2. Leakage in emission system

3. Faulty vent solenoid

What is the fault code P 0442 for 2000 Durango with check engine light on?

It means "Evaporative Emission Control System Leak Detected (small leak)" What that means is a tiny leak in the fuel evap system, most likely the gas cap. Remove and reinstall the gas cap (past the clicks) and clear the code. If the code comes right back, check the hoses leading to the charcoal canister near the gas tank under the truck for wear. My '99 Durango throws this code about twice a year, I just clear it and it's good to go for about 6 months. This code will never affect the drivability of the truck, It's just there for pollution purposes, like most OBD-II codes. Good Luck! See this; http://www.obd-codes.com/trouble_codes/generic/p0442-evaporative-emission-control-system-leak-detected-small.php

Why would the hold light be flashing?

When the hold light is flashing, it means there is a problem with the transmission system. The problem can be various things including the transmission is locked in a gear and can be caused by overheating or a speed sensor problem.

How do you turn the service and stop light off on the dashboard of a Renault laguna?

Turn on the ignition but do not start the car, press the button on the end of the wiper arm until the "miles to next service" is displayed on the odometer. Then press and hold the trip reset button until the display resets to 18000. This should also turn out the service and stop light. Turn off the ignition then restart the car.

If your car has serv (amber ) and stop (red) lights showing it could the immobiliser.

My 1996 Laguna lights come on and car won't start. Car needs to be started within a certain time period of doors being unlocked.

Using key lock all doors then re-open this should reset system.

I have had stop light on until car is started 3 times successfully (resets codes)

How do you replace Oxygen Sensor on 2000 Ford Expedition?

Oxygen Sensor There are actually (4) O2 sensors on your truck. If you look inside the wheel wells behind the fender liner, right about where the frame is one O2 sensor, the other is underneath the truck about half way back in relation to the transmission. If you see where the exhaust joints together, you went about 6" too far.

When you start looking at the O2 sensors, they are normally numbered something like "Bank 1 Sensor 1" Bank 1 is on the passenger side; Bank 2 is on the driver's side. Sensor 1 is the upstream sensor (near the frame, between the block and the cat) and Sensor 2 is near the Y-pipe (downstream of the cat).

Normally it is the upstream sensors (sensor 1) that go first. They see the harshest conditions. You will need; Oxygen Sensor Socket Anti-Seized Penetrating Oil Sometimes it will take 15 minutes or take a few hours it depends on your luck…

How do you get the check engine light to go off on a 2005 Mitsubishi lancer?

The light is on for a reason. To start with, have your local auto parts store read the diagnostic trouble codes. Then post the results here with a new question.

What does P0308 trouble code mean?

Trouble code P0308 means: Cylinder #8 misfire detected

How can I clear a 'Check Engine' light in a Volvo S40 without an expensive trip to a service station?

AnswerAutoZone will check it for free, give you the error codes that caused the light to come on and they will reset for you. However, you must fix the problem or the light will appear again.

S/V40/70 older-1999 = Need to use the OBDII testern.

S/V40/70 1999-newer = Putting the ignition key into position I, push in and hold the odometer reset button (use your left hand), move the ignition key to position II, when the service light begins to blink,let go of the odometer reset button. Confirm by turning your Volvo off then on again.

* There are 2 lights on some Volvos, e.g. 2001 S40. One is the check engine light; the other is the "service light". I believe this solution is only for the "service light", not the "check engine" light. I did try it on our vehicle and it did not get rid of the "check engine" light and only the service light flashed.

Coolant reservoir is loosing watercoolant daily only leak found was water coming out of exhaust pipe and check engine light is on - Chevy malbiu 2000 - what reparis are required?

Have the cars cooling system tested at a reputable shop . The test you want to have done is a LEAK DOWN test which will give you a good idea where this problem is. Often this problem is due to a leaking head gasket.

Can Wrong muffler causes engine light to stay on?

yes can cause poor exhaust flow and cause car to set codes for cat. converter, o2 sensors ,or fuel trim

Why does the engine coolant light appear on a cold start only for a 14 mile or so?

I am having sort of the same problem. My coolant light comes on after I've been driving for a while or if my car has been idling. I have checked all of my fluids and the car doesn't seem to be over heating or running hot. Any suggestions on what might cause this? My dad seems to think there is a short in the wire or the sending unit.

The low coolant sensor is a poor design and prone to failure. Get this - you have to buy the bottle to replace it, as the sensor cannot be purchased separately. The good news is, just unplug it. The light will go out and no codes will be generated. Just check your coolant level from time to time, like we all should do anyways when we check other fluids.

Why does a check engine light stay on?

The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle.

Generally, a check engine light is lit when there is a problem in the emissions or somthing that is affecting the effectiveness of the emissions.

What causes the air bag light to stay on you have a 1991 Mazda miata?

The ECU has detected a problem with the SRS. It is dangerous to work on this system therefore have this repaired by a professional.

How do you reset check engine light on a 1998 ford mustang 3.8L?

somethings wrong still if you light is on most likely has to to do with the EGR valve or a Vacuum leak

What happens if you overfill your engine oil in a 2004 vw beetle and How can I clear it out of the system?

Start by draining some of the oil out. I f you don't pan gasket or main bearing seals may start leaking due to high oil level.

from cliff:

According to something recent, I think at the VW dealer, overfilling can damage the catalitic converter. According to my old-school-Dad, excess oil would be blown out the "breather tube"; better a quart low than a quart high (he would tell me.) Those were the days before the California Cat Converters existed, yet I know not if such a tube still exists, where it discharges, or why they would permit the expensive cat converter to be damaged by overfilling.

Tangent; leaky fuel injector, and other things, can cause gas (or antifreeze) into the oil supply, raising the level while also reducing lubication due to thinned out oil.

How do you reset the check engine light on a 1997 Mitsubishi Eclipse?

This is out of the haynes code book. Disconect the negative battery cable for thirty seconds.

Simply removing the negative terminal from the battery for a couple minute and put it back. that should work

If light keeps on apperaring, you should replace the oxygen sensor located on the headers.

Why would you replace the oxy sensor for no reason???????!!!!!!!

Get Auto Zone or Advanced to pull the codes for you first for free, then take action and fix it.

Sorry for the redundancy, but disconnecting the battery will reset the system. If the check engine light comes on, the most common problem is a bad oxygen sensor. That is why it was suggested that you replace them. If they are bad, you will be getting reduced fuel economy. There are 2 sensors: one before the catalytic converter and one right after the it. They are easily accessible, so replacement is easy.

; Another very common reason for check engine is a loose or bad gas cap