STL-986
When you get time graph your O2 sensor "voltage signals" for all 4 O2 sensors at idle.
and RPM. Then post the graph so I can have a look see.
They are in actual values under the engine module.
Before you do the graphing go in and click on each O2 sensor "voltage signal" with key on but engine off.
That should show you the "BIAS" voltage on the signal wire.
It should be 0.45V That will test the signal wiring between the DME/ECU and the O2sensor.
Then click on the O2 sensor heater signal again with key on but engine off. This will test the wiring and voltage to the O2 sensor heater circuit. I think the spec. is 4.5V or close to that.
Then get the car up to operating temp. and graph the 4 O2 sensor voltage signals and the RPM.
Just let it idle during the graphing
