Check Engine Light at 3000 miles? Common?

[F82Steve]

I have a 2015 M4 and my check engine light has come on. I was told there was two codes and this is the second time I have had to bring it back to the dealership for repairs.

Code: 12B304 Lambda probe heating after catalyst activation: Line Break

Code: CD0487 Central Gateway: Synchronization failed.

Anyone have a clue what these codes mean?

Car is currently at the dealership (2nd visit).

Thank you!

[F82Steve]

Originally Posted by darge82

What codes did you have on the first visit? The central gateway fault is an erroneous fault do not worry about that. The other fault is an O2 sensor issue. Either a wire problem from the O2 sensor to the DME or something internal in the sensor failed on the heating circuit.

Is the car modded at all? Do you have downpipes?

Car is completely stock. The first time I brought it, it read the same exact codes. They replaced one O2 sensor, now the other one is bad.

[heckyeahbro69]

Take it to the dealer. Common problem. There is an sib

[solstice]

I had intermittent check engine light that was diagnosed to "lean fuel mixture". The dealer worked with BMW corporate and fixed it with a SW update. No re-occurrence after that.

[heckyeahbro69]

12B304 - Oxygen sensor after catalytic convertor, activation: line disconnection

cause
Under certain conditions, moisture can enter the internal insulation layers of the oxygen sensor.


If the sensor’s heating activation occurs too early, the internal pressure can damage the sensor elements, leading to the faults being set.


correction
Replace the damaged oxygen sensor as instructed in ISTA. Program the vehicle using the latest version of ISTA/P.


Target integration (new): F020-14-11-501 or higher



Note that ISTA/P will automatically reprogram and code all programmable control modules that do not have the latest software.

[F82Steve]

Originally Posted by heckyeahbro69

12B304 - Oxygen sensor after catalytic convertor, activation: line disconnection

cause
Under certain conditions, moisture can enter the internal insulation layers of the oxygen sensor.


If the sensor’s heating activation occurs too early, the internal pressure can damage the sensor elements, leading to the faults being set.


correction
Replace the damaged oxygen sensor as instructed in ISTA. Program the vehicle using the latest version of ISTA/P.


Target integration (new): F020-14-11-501 or higher



Note that ISTA/P will automatically reprogram and code all programmable control modules that do not have the latest software.

Picked up my car yesterday. Two of the four sensors have now been replaced.