does anyone have the wiring diagram coming from the harness side of the pcm for the oxygen sensors on a silverado... Not sure if i have the pigtails setup properly... On the drivers side there is a pigtail that comes close from the tranny side... does that one go to the rear o2 sensor.. or to the pre cat sensor? and there is a long pigtail that comes over from the tranny..Btw its for a 2005 silverado... The reason im asking is i put my truck cats back on with stock exhaust manifolds and im still getting codes after i reset... I put new sensors as well And im getting frustrated.

 

The Pre cat goes up near the front of the trans and plugs in. Like above the range switch area.

The Post cat 02 plugs in near the rear of the trans. The Harness comes across the trans crossmember I believe.

I would have to look when I bolt mine back up.

 

The reason im asking its cause i changed all 4 sensors...and im still getting p0053,54 59,60 and p0157 and im stumped... all 4 pigtails are showing that they do have voltage going to them.. but not sure if i plugged the harnesses to where they go.... and i put my meter on tested postive ..not sure if its also cause i have 1 bosch sensor thats making all the others go off... the rest are denso and delphi sensor

 

Just verrified and what I posted is basically correct. The front is above the range switch and the rear is at the trans crossmeber on the driver side. The OE on my truck are Denso. I have had issues with Bosch in the past on other vehicles. I always replace with OE.

 

Aren't P00 codes heater codes? And the P0157 is a lean code?

 

Is bank 2 sensor 2 the bosch sensor ? If so it's probably bad. The heater code could be a fuse.

 

Check the 15 amp fuses #3 and #4. I would have to find a schematic to see the whole circuit.
I'm guessing the PO137 is a bad sensor and likely the Bosch. Also make sure the replacement denso sensors are the same part as what you removed. Then verify the O2 plug on your engine harness has no bent pins or corrosion. Other wise if they where shut off in the tune, they need to re activated to function properly.

 

Yea they are heated codes. .and the p0157 code is showibg that its low voltage...

 

Yea checked those fuses still good...and the truck doesnt have a tune no more.. swapped in a new pcm

 

The bosch sensor is the bank 1 sensor 1