How do you turn of the "check engine" light on a '93 a6 with the 2.8L v6?

Answer 1

the most simple way is to remove the battery for at least 10seconds to reset the car's ecu (engine control unit) or pcm as it is otherwise known. this will clear all of the fault codes stored in the ecu. However if a fault persists in your vehicle then the cel (check engine light) may still illuminate. In which case you have a major fault or weak signal from a sensor being logged by the ecu. If this is the case then take the car to a mechanic and ask for a aldl obd1 diagnosis, it will tell you exactly what the fault is and how to correct it.

Answer 2

There are a few things to consider:
-Have you had any work to the engine done recently?
-Any aftermarket performance parts installed?
-Any other variables out of the normal to mention?

I dont know Audi but I believe a 93 runs OBDI (On Board Diagnostics version I) OBDII started in 1996. OBD provides almost complete engine control and also monitors parts of the chassis, body and accessory devices, as well as the diagnostic control network of the car.

When the Check Engine light comes on, the computer (PCM/ECM) has detected a fault. If the car is bone stock, meaning you have not modified the car with any aftermarket performance parts. This means the computer is doing its job and something is wrong. Your computer is now generating an error code. There are inexpensive "code scanners" for ODB. They plug into your car and read your error codes, then you can find out what the computer says is wrong.

This is helpfull since mechanics are not always the most honest people. I would buy a code scanner, find out my error code. Then take it to a repair shop that can fix ODB. ODB mechanics tools are very expensive. Some shops dont have the ODB tools. Take it to a reputible shop or dealer. Then have them check your computer. If you already scanned your code and it said "misfire on cyl 4" and your shop says its going to be $3k to fix your fuel injection system...get your keys and run away.

That is just an example. There are many variables

Answer 3

Iceplayr has a good answer but i would add that some auto parts stores will either read you fault codes, or lend you the tool briefly, for no charge.
They make their money by selling you the broken part identified by the service codes.

Answer 4

matt c i right if the problem still accuse its your time belt