They have replaced what it says to do, but still is not fixed.....they are scratching their heads.
When the light comes on, one or more diagnostic trouble codes (DTC) are stored in the engine control module. These DTCs remain even if the light goes out. To address a Check Engine Light problem, the DTCs are retrieved and the appropriate troubleshooting information is followed in order to determine the problem.
The four most common Check Engine Light scenarios and what to do:
* The Check Engine Light turns on and off or flickers.
If the Check Engine Light comes on in the city but goes off on the freeway, then the fault is present during city driving conditions. Pay attention to whether or not the vehicle runs or drives any differently when the Check Engine Light illuminates. If vehicle performance does change, drive the car as little as possible and take it to be checked by a service professional as soon as possible. If there is no change in vehicle performance, you can drive home, but have it inspected as soon as possible. In this condition, you run a risk of the vehicle dying or not starting.
* The Check Engine Light comes on and stays on.
If the Check Engine Light illuminates constantly during driving with no noticeable driving or performance problems, there is a permanent fault in the emission control system. When this happens, the computer that controls the emission system usually has a backup program that runs while the fault is present. (These backup programs are often referred to as "limp home" mode programs.) You should get the vehicle serviced as soon as possible, but in most cases, the vehicle will continue to operate, though you run a risk of it dying or not starting.
* The Check Engine Light illuminates, stays on, and there are performance problems.
This means that a vital component of your emission control and engine management system has a serious problem. It usually involves a component or system needed for the vehicle to run at all. In most cases, drive the vehicle as little as possible. In many cases, the vehicle is not safe to drive at all -it could stop or stall out at any moment. It is best to pull over to a safe place and have the vehicle towed to an automotive diagnostician for a thorough inspection and repair.
* The Check Engine Light light comes on and blinks in a steady pattern while driving.
Don't confuse this steady pulsing of the Check Engine Light light (usually one or more flashes per second) with a flicker (see above). The Check Engine Light may stay on steadily or it may flash when the vehicle is accelerated. This is very serious. There is a severe failure of the emission control system that is causing the engine to misfire to the point that the catalytic converter is damaged each time the Check Engine Light flashes. It may mean that the catalytic converter is overheating to the point that it will glow red or, in extreme cases, start a fire on the underside of the vehicle. Immediately pull over to a safe place and have your vehicle towed to an automotive diagnostician for repair. Vehicles can be severely damaged and even destroyed by fire if this condition is ignored for too long.
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SOURCE: 2001 vw jetta gs :check engine light goes on and off
sounds like a faulty sensor tripping and reconnecting.. the next time the light comes on, take it to an advance auto store or an auto zone, they can read your codes for free... this will tell you what is being tripped, that way you know exactly what you need to get checked and/or fixed instead of a mechanic poking around trying to find everything thats NOT wrong. but if you are not expeiriencing any difficulty with the car, you should be fine. the check engine light actually means alot less than most people think. its usually a transmission or emissions sensor, or even as simple as leaving your gas cap off after filling and then driving for awhile.
SOURCE: 2003 vw passat 1.8 rough
dont drive make sure you get the timeing belt put on buy a good repair place. one that wont burn you up belt might be 60 bucks but that engine is 2000.00 used . the worst option is that it might need turbo is there smoke . or rough idle comeing from turbo blade will make a nose if it is going out start and listen to turbo if it coming from there turbo . i should have one used for about 300.00 plus shipping [email protected]
SOURCE: my 2004 VW Golf had the check engine light on.
Go to any autozone store. Most will check your codes for free
SOURCE: 2003 VW Golf - O2 Sensor?
Honestly it is not very expensive to replace, but it is not extremely important. What it does is measure the oxygen/fuel level coming out of the engine. This tells the computer that the engine is either using the right air/fuel mixture or allows the computer to change the mixture slightly to allow the car to run properly. You could pull the sensor out and clean the terminal as it usually has alot of carbon build up due to its location, but this is normally a temporary fix. I hope this helps you with your problem.
SOURCE: 2004 vw beetle check engine light comes on gives a
check to see if one of the plugs are saturated with oil due to a bad valve cover gasket
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