[Smlewis2014]

I have a 2007 mazda3 and the wiring harness where the downstream sensor comnects melted so i dont know what the wiring diagram is for the engine side. There is a black w/ red stripe, a green wire a brown wire and a yellow wire

can someone show me where each wire goes please? I have one day to get emissions ive been fighting with this thing for a good month

 

[hatch06]

I have a 2007 mazda3 and the wiring harness where the downstream sensor comnects melted so i dont know what the wiring diagram is for the engine side. There is a black w/ red stripe, a green wire a brown wire and a yellow wire View attachment 105617 can someone show me where each wire goes please? I have one day to get emissions ive been fighting with this thing for a good month

For the rear HO2S (gray), looking from the back (harness side) of the engine connector (protrusion/latch at top): C is W/L; A is G/R; D is BR/L; and B is B/O. (wire-color/stripe-color)

Did you already figure it out? FYI, there should be 3 heated oxygen sensors (HO2S) -- front, middle, and rear. I'm not 100% sure you're talking about the rear sensor...

 

[Smlewis2014]

Ill try it thanks.

 

[Carkilla123]

None of that makes sense to me that you said up here above I have a black wire with a red line a green wire a white wire and a brown wire The only one with the stripe is the black one I want to know how it hooks up to the O2 sensor that only has two black wires and white wire and a blue wire no lines and those neither