100K engine light won't stay off....... 1996 850 GLT.. I can turn it off but come back on.

Well, I've figured out how to turn the 100K "service engine" light off
but it keeps coming back on. To turn the light off, I disconnected a
battery wire for at least for 24 hours. When I reconnect the wire and
start the car, the engine light stays off for a while then it come
back on after about 200 to 300 miles. After the engine light
originally came on, I had a tune up done but I didn't notice any
performance difference and it didn't keep the light from coming back
on. Can anyone suggest what needs to be done to keep the engine light
off? Thanx.

 

[Boll Weevil] (Mon, 16 Feb 2004 01:15:56 -0600):

Getting the garage that did the "tune-up" to reset it.

 

They did reset it but it came back on after a few hundred miles.

 

The light is on because the engine controls are sensing a defect. If the
defect remains the light will keep coming on until whatever is wrong is
fixed. Whoever did your "tune-up" probably did a list of standard things
(plugs, filters, etc.) but did not read out the error codes and advise you
as to proper corrective actions.

In your case it sounds like you need to have a competent tech. pull the
error codes and take it from there.

It could be any of dozens of things. By law modern car systems are required
to monitor things which potentially can cause increased emissions and then
light the service light when any of the conditions is sensed.

John

 

[Boll Weevil] (Mon, 16 Feb 2004 10:21:08 -0600):

In that case they did it wrong, and you should go back and get it done
properly

 

Which Light is on ?
The Check Engine Light or the service light if it is the check engine light
there is a engine code that keeps setting the light off , if it is the
service light have the repair shop reset the light

 

Pull the bulb! This way we fix many problems in our taxi's (mercedes), like
ABS, SIPS and other problems.