Oxygen sensor heater codes
I have this 2010 Cobalt that keeps setting the P0053 and P0054 codes for the upstream and downstream oxygen sensor heater resistance.
It was having this issue previously. The customer installed both new aftermarket sensors before bringing it in for me to be the hero. I cleared the codes and reset the oxygen sensor "Heater Learn". Codes rest as soon as the monitor set.
The oxygen sensor voltages seem are OK.
On the scan tool, the upstream heater goes to 7% and the downstream heater goes to 98% as soon as it is started. They both stay at this reading with no change until key is switched off. KOEO they read 0% and commanded off.
All the wiring appears OK, nothing rubbed that I can see. I am stumped and just not sure what to look for at this point. Usually I can diagnose things pretty well, but for some reason, this one has me scratching my head and I am overlooking something. THANK YOU!
What testing have you done? I think if you post up the testing and data youve gathered so far, we can get a better picture as to what is or isn't occurring. There are probably a dozen reasons as to why you are getting these codes,but it would be redundant for us to tell you to check things you've already checked.
Before you spend any more time on this, order/install ACDelco sensors. Too many vehicle to count that AM sensors do not respond the way the OE one does.
When I look up the parts, it shows Denso as the OE brand for the front sensor and NTK/NGK as OE for the rear sensor. Does ACDelco put these brands in their boxes, or do they sell their own line of parts?
.....or is the parts store making stuff up. :-)
I've often wondered about that on GM sensors myself. One case I read the guy went to the GM dealer for the sensor and it was a Bosch inside the box.
I get your point. The image I posted is from Napa Prolink. I used to work at a shop that got their parts from Napa, and when looking up stuff like O2 sensors or spark plugs, they will list tons of brands to choose from, but they will usually have some note next to the one that is OE or the OE manufacturer. I found it to be very accurate as far as which brand was the OE for the particular car. Whenever replacing the part, I would check the brand markings and the brand on the old parts would match what Napa showed as OE in their catalog.
I'm not real familiar with ACDelco. I think GM uses ACDelco spark plugs, but other than that, I don't remember them using ACDelco oxygen sensors. ACDelco may sell oxygen sensors labeled OE, but I would bet the part in the box has another brand marking on it.
I believe the story you mention of the guy getting a Bosch oxygen sensor from the dealer. GM used Bosch as the OE sensor on some of their cars. They didn't just stick with one brand. Thats why I always looked up what the OE part is for the specific vehicle.
I recognized ProLink from the screen shot. We use that here since Napa is the only store on this side of the island. They have a few different uses of the term OE and one has to be cautious. Sometimes they say "OE manufacturer" which means that the company does indeed make OE parts....but not that the part you have looked-up is necessarily THE OE part for that situation. Other times they say "EXACT OE PART" which is less ambiguous. Also the longer we all do this the less we can trust any parts supplier to make anything the same way twice, let alone 15 years later, so there's that too. The companies change plants and procedures over the years as they concern themselves with parts for newer vehicles, and jobs get sub-contracted.
You are exactly right. Even when getting parts from the dealer, the part may not be the OE part that was installed on the assembly line because they may have changed to a different supplier after 10 years or whatever. I've seen that before.
I do find that the OE notifications on Prolink tend to match up with the brand of parts on the car though. And you are correct, you want to look for "Actual OE part" as the best indicator on Prolink.
Get some OEM oxygen sensors. I've run into this many many times. For whatever reason the PCM's on many vehicle's won't work with the aftermarket sensor's heater. I've even seen some PCM's heater circuits damaged due to aftermarket sensors so you may want to double check for a pcm fault.
Koeo o2 sensors should read 450mv...what do they read?
Sorry for the delay, I did find some rodent damaged wiring that was bare hidden inside the loom near the plug behind the engine. So for the time being, I had to just tape them up to keep them from rubbing together. The customer needs the car back right away now, so I have to wait until he can get it back in here to check it further.
I am going to recommend the OEM sensors.
The sensors do read 450mv KOEO
Testing the heater circuit from the PCM, the PCM and the wiring on B1S1 are working properly now. I still need to repair the wiring properly, and check the downstream sensor circuits more to determine what is going on.
Thank you for your assistance!