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Old 01-21-2020, 02:30 AM
BabyUnicornTaco BabyUnicornTaco is offline
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Location: Charleston, SC
Join Date: Jan 2018
Posts: 2,481
Mein Auto: 2008 X5 4.8i E70 Sport
Originally Posted by mmakabeh View Post
I am getting fail codes on Catalytic converter.. also on BanK 2 up and down on the O2.

Do you think it is the Cat or the O2 sensors?

or something else. ?

Itís typically the O2 sensors that go bad long before the cats but do you have a vacuum leak somewhere and the O2 sensors are working as they should? The O2 sensors are going to let you know your air/fuel ratio is off.

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2008 X5 E70 4.8i M-Sport
2008 550i RPI Exhaust, RPI Ram Air
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