I need to know the colour of each wire on the Rear 02 sensor on my 2005 chev silverado 5.3L. What colour is the Signal wire,+12 wire, ground, and heater wire? Thanks

 

Ok working from memory here...

You should have 2 Grey wires, those are the heater wires.

The remaining 2 should be a lite color or white and a black. The black is the ground while the remaining would be your signal wire.

I hope this helps

 

What's the power wire (+12) then? I don't remember 5 wire.

 

Err sorry should have been more clear. Technically one of the Grey wires is the +12v line that is only used for the heater. Since the heater element doesnt care about polarity GM never bothered to indicate which was the +12v and the ground for the heater.

 

LM7 and L59 Engine

Pin Wire Color Function

A TAN Low Signal Bank 2 Sensor 1
B PPL High Signal Bank 2 Sensor 1
C LT GRN Heater Low Control Bank 2 Sensor 1
D PNK Ignition L Voltage

 

I have a 05 silverado...they changed the rear O2 sensor in 04 and 05. My colours are...Pink, Tan, Red w/white stripe and Black. Which do each represent? Thanks

 

Sorry wrong year. See if this helps. Right Click/Save as
05 O2 Schematic

 

Bah cant GM stop from changing the wire colors every few years lol...