I currently have some Bosche O2 sensors that are just over a year old. My Scanmaster is showing the right side acting crazy. I have heard you guys say nothing but bad things about The Bosche product.

The parts house is going to replace them under warranty and I have the choice of Bosche, Borg Warner or Delphi. Is the Delphi the OEM GM part?

WIll I be fine with the Delphi.
Thanks

 

When GM sold off AC/Delco, the new company is call "Delphi"..... so, yes, Delphi is OEM.

What do you mean by "acting crazy"? Have you tried swapping the left and right sensors to see if the problem (whatever it is??) follows the sensor? That would allow you to determine if its actually a sensor problem, or if its something else.

 

No I have not swapped them. I think its possible they may have been affected by the coating from my headers. Since the shop said they would replace them I am going to jump at the chance to get the OEM sensors instead of the questionable Bosches.

Acting crazy the voltage on the left was consistent the right side was bouncing around from 100-900 with no apparent consistency to be seen.
I recently checked header bolts and I don't have leaks.

 

Like Mr Fred said, first find out for sure if it's the o2 sensor that is bad or something causing it to read that way before you order parts.

 

Actually, its the right one that is running correctly.... when the PCM goes into closed loop, its going to switch between slightly rich (900mV) and slightly lean (100mV) about 9 times per second, if its functioning correctly.

If the left one is steady in closed loop, its not working correctly. Let me take a guess.... is the left one nice and steady, aroung 450mV? If not, what is the reading?

 

Yes, the left is holding right around 400-450 or so in closed loop.

 

That means the left one it either dead, or is not connected. Did you use any extensions when you added the headers?

 

Yes I have 12" extensions, no hacking on the harness. I checked and they are hooked up and in good condition.

Would it still giva a reading if it were not making good connection?
Again the value will bounce around just a bit, it also seems to respond to RPM change. It sounds like it is working but not the way it should.

 

With no sensor connected, or with a dead sensor, the PCM sees only the bias voltage it supplies to the sensor, which is 450mV. Swapping them will tell you very quickly if its the sensor or something else. If the problem moves with the sensor, its a dead sensor. If the problem stays where it was, its the wiring or an engine problem. Then you swap the extensions side to side to see if thats the problem. I've seen people with problems with new harness extensions, so don't rule anything out, or assume they are making reliable electrical connections because they look good.

Since the voltage is moving a little on the left side, its a good chance the sensor is deceased, but its sure a lot cheaper to do the swaps than to just assume its a sensor and buy a new one.