Hello folks. Looking for help to see if there is a tie in somewhere that all 4 O2 sensors have in common.

My original problem was a transmission stuck in safe mode and no overdrive. I had multiple transmission codes. There were no other codes or problems besides the transmission.

I wound up having to change the ECM. That has fixed my transmission problems and it shifts fine. However, immediately after putting in the new ECM, I had 16 codes related to all facets of all 4 O2 sensors. I contacted the computer company and they had me do a factory reset.

Now I have 4 codes:

P0135 - bank 1 sensor 1 heater.
P0141 - bank 1 sensor 2 heater.
P0155 - bank 2 sensor 1 heater.
P0161 - bank 2 sensor 2 heater.

Is there a central wire harness a something all 4 sensors have in common that would cause all sensors to code for the same thing?


Truck is a 2001 Ram 1500 4x4, 5.9l, with California emmisions.

Thanks for any help you can provide.

Mike

 

Upstream sensors get their power from fuse K in the PDC, downstream sensors get their power from via a relay, but, it also gets its power from fuse K..... Check the fuse, bet it's blown.

 

Welcome and replace with denso brand

 

I'm going to go out on a limb here and say they sent you the wrong PCM.,...well, CORE actually. The wrong core with the right software.


CA Emissions have 4 O2 sensors, the rest have 2 for that year. The pins are different also.


The 2 O2 system that HeyYou described is correct, BUT the 4 O2 system is like the later model setup. (Below)