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      11-28-2012, 08:43 PM   #3
Ch3ss
First Lieutenant
United_States
4

 
Drives: E90 335i
Join Date: Apr 2010
Location: CA


Posts: 302
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Quote:
Originally Posted by Jeff@topgearsolutions View Post
Not positive but your primary o2 sensor may need replacement. I'll let others chime though.
that's what im thinking too. but i'm new to this so just looking for some experience minds out there. would both pre cat sensors need replacement or just one.