2011,3500 diesel codes

 

P2271- O2 Sensor Signal Stuck Rich Bank 1 Sensor 2
Does the diesel even HAVE O2 sensors?????

P2a01 refers to an error on the same sensor.....

P013a is slow response, from the same sensor.....

P2bac is nox Exceedence - Deactivation of EGR
NOX is high. Why becomes the question. Think I would replace the sensor in question, clear the codes, and see if everyone is now happy.

 

Thanks. I replaced the sensor in question and p2bac code comes back?? p2271 is still permanent and all other codes dissapeared

 

Does your truck use DEF? Is the tank empty? How many miles on it??

 

thankyou for your help.
No DEF.100,000km

 

Likely going to be a wiring problem then. I suspect the other two codes will come back eventually as well....... Of course, it may also be a fueling problem, but, I would expect to see different codes for that...... Diesel really isn't my strong suit though.... so, hopefully someone with more of a clue will be along.