Adding o2 sensor on m42

[Bracky]

Hi all first post so go easy on me if I make any mistakes.
I have a 1991 318is which did not have an o2 sensor from factory and would like to add 1. Ive fitted the bung and sensor to the correct position in the exhaust but need help with the wiring side??
Any help would be appreciated

[jmc330i]

I know on the M20 cars, the wiring/plug is clipped up to the underside of the battery tray. I dont know if its the same on the M42 cars, but would be worth a look.

Just out of interest, why do you want to fit the sensor?

[rix313]

I know on the M20 cars, the wiring/plug is clipped up to the underside of the battery tray.

Yes it is the same on the M42. Look out for a seemingly random round plug

[alync205]

I am fairly sure that there is a wire in behind the plastic cover on the bulkhead that you have to connect for the O2 sensor to work also.