Error code P0031 on 2001 Dodge Durango

I just replaced my bank 1 O2 sensor twice but I am still getting the following codes P0031 and P0135. My mechanic suggested I take it to a dealership ? Could it be a bad 02 sensor this guy is putting in or maybe he just does not want to check the wires ?

by in Old Bridge, NJ on March 29, 2011
4 answers 2 comments
ANSWER by on March 29, 2011
the heaters in the o2 have a fuse to protect the circuit when there is a fault. replacing the o2 may be the right thing to do but if you dont find the problem, the code will return. the tech may not be familiar with the system and thinks he has a bad 02. a simple check of fuses may bring the o2 back on line. check them first before sending to dealer. he may have fixed the problem but not all the way. roy
COMMENT by on April 14, 2011
Thanks guys : Mastertech6371 and Johnny Mopar I took to the dealership and replaced the Upstream 02 sensor which the guy told me I would be in and out in no time. But because you guys brought some things in which I asked them to check out , this caused them to really check out everything before replacing the 02 sensor.. I was not in and out as they promised afterall but they know that if the problem comes up again I have a prinout showing they check the wiring, fuses etc... Thanks guys for the help on this issue !!!!!!
ANSWER by on March 29, 2011
The fuse as mentioned in the previous answer is only on the Sensors heater circuit. Diagnostic codes do not give you the cause of the problem, just a direction to start. Too many mechanics just replace the part. Wiring is the most critical part of any circuit and all connectors must be clean, free of moisture and oil and the terminals must fir securely. A loose fitting terminal will cause havoc in the computer circuits as they are all low voltage and sensetive to resistance fluctuations. Last but not least, the Powertrain Control Module (PCM) connector must also be checked. Keep in mind that the PCM can also fail.
COMMENT by on April 14, 2011
Thanks guys : Mastertech6371 and Johnny Mopar I took to the dealership and replaced the Upstream 02 sensor which the guy told me I would be in and out in no time. But because you guys brought some things in which I asked them to check out , this caused them to really check out everything before replacing the 02 sensor.. I was not in and out as they promised afterall but they know that if the problem comes up again I have a prinout showing they check the wiring, fuses etc... Thanks guys for the help on this issue !!!!!!
ANSWER by on August 09, 2011
what senseors is this
ANSWER by on November 26, 2013
Have you checked for a bad catalytic converter?