2nd Gen R56 Cooper S Most liked posts in thread: Check engine after brake pad change?

Not sure, but if you have an auto parts store close by they may be able to do an OBDII scan and let you know what is going on.

 

Did the light come on as soon as you started the car after the brake change, or a few days later? Might just be a coincidence (?)

 

Seems I'm posting this everywhere lateley!

In general, if you're going to work on a modern car, I cannot stress enough that you MUST have your own scanner or diagnostic software. To do otherwise is like being an engine mechanic without a torque wrench.

Here I offer a couple Innova scanners for about 50% off retail.

Here I offer some Bavarian Technics diagnostic software that does much more than just OBD-II diagnostics. In this case it would have told you what the ABS system was seeing that threw the codes. Usually that "trifecta" is from a wheel speed sensor that isn't well connected.

Whether you buy from me or not, you really, really, really should get some form of diagnostic tool. No, they aren't perfect, but without them, you don't have the "ears" to listen to what your car tries to say to you.

Matt

 

I don't know why...

but there has been a rash of posts saying something along the line of "I did X, and now I have a check engine light. What's wrong?" with no code posted. Guess it's just the luck of the draw!

Matt

 

Those wheel speed sensors are a pain in the butt. I had gremlins in my car for months with "randomly" occurring lights and CAN bus errors, etc. Eventually cleaned the wheel speed sensors and used dielectric grease on the plugs, and no more problems.

 

Did you battery run down pretty low while you were working on the car, such as you had a door open? I have had various lights come on when the battery is low but the car will still start. Then after after restarting the car the lights go out.

 

Wheel speed sensor

is by far the biggest cause of the dreaded trifecta of lights.

Matt