Quote:
Originally Posted by SnowRacer
...Finally got to do a half a dozen WOT runs after having the CCV/PCV valve heater replaced under the BMW recall. No more smoke cloud, no more misfires, no more deluge of fault codes!
I still do have the O2 heater control sensor 2 faults for both banks (P0036 and P0056), but it runs great. I'll replace those two post-cat O2 sensors soon and then it should be back to 100%.
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Hi Gary,
Good to hear the "Cloud has Lifted"
As previously stated, those two codes suggest a wiring fault rather than a fault in the Post-Cat O2 Sensor Heaters themselves, particularly if BOTH codes for BOTH post-cat heaters occurred at the same time (simultaneous failures of both Sensor Heaters is statistically UNLIKELY). Here is the Code Definition from BMW Fault Code Lookup:
N51 | P0036 | 2C9E | DME: Oxygen sensor heater after catalytic converter Activation | MSV80
Here is the TIS circuit diagram again, followed by F38 circuit:
https://www.newtis.info/tisv2/a/en/e...ontrol/vF5QqMj
https://www.newtis.info/tisv2/a/en/e...xi-lim/vFbq6N3
To me, the use of the word "Activation" suggests an issue with the DME-switched Ground connection, such as a bad connection at Pins #2 or Connectors X62102 & X62202, the two Post-Cat O2 Sensor Connectors, but of course it could ALSO be lack of 12V+ at Pins #1 (Orange wires).
I don't suppose the Dealer tested or reported the functionality or condition of the Breather Heater that was removed in the Recall Procedure(?)
I would recheck F38 if there is NO 12V+ at Pins #1.
George