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      02-06-2013, 07:11 AM   #3806
sparkyblue's Avatar

Drives: E82 135i & E92 M3
Join Date: Jan 2011
Location: USA

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2008 BMW 135i  [0.00]
Originally Posted by blakonblak View Post
Hello Everyone,

I was hoping someone could help me out with an Pre cat O2 sensor issue im having. Dealership says my PreCat O2 sensors are damaged and need to be replaced. Quoting me $1200 for the job. I read that that Bosche O2 sensors are ~$130 online. So I am guessing the $1000 is for Labor?! Should I just go ahead and do this job myself? I heard the job is a pain.

Dealer also switched out my battery and bill is now $700, so they will be adding $1200+ to the bill with those o2s.

Also, would these be the right sensors? at
While you have the DP's out to swap the sensors, you might as well purchase a set of catless downpipes and install them both in one go. You can then run a higher map (assuming you are tuned) and also enjoy the new found intoxicating noises coming out of your exhaust.