Can someone help me out here, My 2007 tsx's check emissions system light periodically comes on.
I get 2 trouble codes, one stored:
2271 - O2 Sensor Signal Biased/Stuck Rich
And one Pending:
0139 - O2 Sensor slow response
I know the 139 is pretty common, just change the sensor? but any idea what the first code is or if I should worry about it? or if its releated?
Thanks in advance

 

P2271 means the secondary O2 sensor (aft of converter) is stuck rich (high voltage perhaps 0.8-0.9V. This is most likely a bad O2 sensor. See attached diagnostic procedure.

P0139 is secondary O2 sensor fault and might also be triggered by this code.

good luck