Just helped my kid get a nice 2009 328xi in titanium silver. It has 120k on it but the car is super clean. Looks new!!! Anyway, the service light comes on throwing a code P0420 bank 1 cat efficiency. The car runs great, no smoke or exhaust smell. I'm thinking try a bank 1 down stream O2 sensor to start before worrying about cat replacement. Any ideas? Also how many O2 sensors does this car have? I haven't even had the chance to crawl under it yet but i'm guessing 3 or 4.
Thanks in advance.
Thanks in advance.
2009 328xi code p0420
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