pp000830

I have a wiring diagram but it looks to be for a pre 96 engine with just one oxygen sensor.
I was hoping someone has the diagram for the later arrangement with the four oxygen sensors.
Also if someone knows what the resistance value across a cold sensor and the heating element should be it would help me verify the status of the sensors.

Thanks, andy

IainM

Can't give you a number but on the basis that only one of your O2 sensors has failed, maybe 3 equal measurements vs 1 oddball might be illustrative.
From what I read, a Nernst cell is a fairly standard device so I would expect all O2 sensors are essentially the same. A 120 ohm heater coil would dissipate 1.2W, which should be plenty to heat a little sensor to 100+deg C. Just a SWAG.

pp000830

I like your thinking & easily done.
Andy

NC TRACKRAT

FWIW, the Bentley 993 Manual has the diagram on p. EWD117.