XC70 PO420 error code

[Kennb]

From what i can tell its the white and gray wire and ive got no continuity between them so im thinking bad sensor.

[hoonk]

white and gray wire

The heater wires (in the sensor harness) are the same color - google shows 2 white wires for the heater, and a black and grey wire for a 4 wire bosch sensor. So in that case the two white wires should be continuous.

https://www.google.com/url?sa=i&sour...78505979664726

[Kennb]

Thanks for all that info, i gotta go thru it after work. The sensor is 5 wire, black, grey, yellow, white and red but the plug has six pins, im gonna cut open the old one and try and figure whats what

[orvieto]

Sorry for a late reply.
Thank you for the great info. I haven't driven my XC for a while, but I'm sure I will see the engine warning light. So now I have a clue.

I'd like to keep the car for another 200K, so will ask you guys more questions.
Thanks!

[Kennb]

Hey hoonk the replacement sensor i put in was junk, went with a Bosch and cleared the code all looks good so far. Thanks for all ur help