Quick O2 question

[Force Fed Mopar]

When rewiring a 4-wire O2 for use on a 3-wire car, you run the grey wire to a ground, right? On the white heater wires, does it matter which they get switched around?

[Force Fed Mopar]

I got it, I found this on a Porsche website:


FYI

I onced worked at the Bosch plant that made the O2 sensor. Basically, there are four possible wiring combinations seen below:

1. 1 wire. This sensor does not have a heater element. A good sensor for engines that run hot.

2. 2 wire. Same as the 1 wire, but a ground wire attached to the case of the sensor.

3. 3 wire sensor. The black wire is the signal wire, the two white wires are the 12V heater element. Polarity on the heater wires is not important.

4. 4 wire sensors. The ground for the black signal wire is isolated from the metal of the sensor. The 4th wire is used to provide the ground path.

IMHO, the 3 wire sensor is best for installing in a 914 exhaust system.

I hope that this helps.