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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Which o2 sensors do I have to replace?



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      06-18-2016, 11:17 PM   #1
Turbeau
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Drives: 2009 335i
Join Date: Jan 2016
Location: atlanta

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Which o2 sensors do I have to replace?

I have 2C32 Lambda code and also a 2C6C lambda code, and it's now affecting how my rpm reacts to my pedal input. On 2 occasions recently the car threw a half engine light, after I restarted the car the boost deactivation mode disappeared.

I took it to a dealer a while back and they said it was my rear o2 sensor after the catalytic converter. I think was caused by a leaking injector (#6) that i replaced in January.

At the time I didn't want to change the o2 sensor after the cat because I was going to go castles dp eventually.

I didn't think the o2 sensor after the cat would affect my driveability so I think my bank 2 primary o2 sensor is also bad. I just want to confirm it before I buy both o2 sensors.

My exhaust almost smells catless and after driving for a while, it smells like mothballs. I have all cats in place and I am assuming one or more of my catalytic converters are burnt up.

I have 2 unknown codes that I looked up but didn't find any information on them. 2A7C and 2FDB.

Thank you.
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