Still have Check engine light on????

[tonyvt328is]

Still have Check engine light on, now it's spring time to fix it. The short story had my driveshaft replaced, when the mech. put it back together I have CEL on. He said it shows both front 02s bad, can not be... changed one. with a good bosch still on.

Could it be a leak?? I can hear a leak when I start up cold in the morning under the hood, I think he may have damaged the donut??

[mymodemisonfire]

Find where the leak is coming from first, and what type of fluid is coming out. If you can hear the leak, most likely there's a puddle of the stuff on the ground.

[tonyvt328is]

Sorry, an exhaust leak!!! LOL

[RNeil]

Do you mean an exhaust leaK? That would look like bad O2 sensors to the ECU. My son in law had the same trouble.

[ANTSTUNT99M3]

Pay about $60 bucks to have a shop find out why you have CEL...don't try and figure it out by assuming it's this and that!! just run the code and go from there.. Good luck with it!

[tonyvt328is]

HIs machine does say that both front 02 sensors are bad.

[Tefal]

did he clear the codes and then re read them

[tonyvt328is]

They wont clear he says.. I dont know much about it.

He spent hours tracing the wires to the sensors last month. I think he overlooked the leak, I know I hear a leak in the exhaust espcially when I start it cold..

[Pilgrim]

Generic 02 sensors aren't that expensive. IMO they work as well as OEM. Just replace them and go on with life.

[Tefal]

Is this the exhaust noise? http://forums.bimmerforums.com/forum/showthread.php?t=733644

[tonyvt328is]

Generic 02 sensors aren't that expensive. IMO they work as well as OEM. Just replace them and go on with life.

One was replaced.. codes stayed the same..