I need to test both of my upstreams. Which wire is the signal out wire? (ie: which one of the four do I need to tap into to check the output voltage to see if the sensor is bad or not?)
Testing 02 sensor- pin out
- Thread starter lanceputnam
- Start date
Typically the 2 white wires are the heating element and the grey and black are the lambda sensor. I believe grey is ground and black is positive but if not mistaken you should read low voltage ie 1 volt but I may be mistaken