E93 335i error codes need help

[MadCentury]

Hi,

i have the following error code in my E93 335i.

2C7F Oxygen sensor after catalytic converter2, trim control
2CAA Oxygen sensor before catalytic converter, temperature
2C3D Oxygen sensor before catalytic converter, line fault.

i believe the 2C7F and 2CAA is caused by 2C3D. Line fault i believe is undetectable, disconnected. anyone can help clarify and maybe share your opinion and experience with me?


Thank you

Kelvin

 

[jarance]

Just change the O2 sensor before cat. there are 2 of them.

No need to change the one after cat. they are for monitoring only.

 

[wideawake]

Did you just install catless downpipe?

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[MadCentury]

Hi

Thank you for reply, i manage to resolve the problem by just throttle up to high RPM (Gear in N Possition) for few minute and the error cleared. maybe too much carbon stuck at the sensors..