89 190E2.6- 5-speed Manual, 95 E320 Sportsline-sold, 2001 E320 4matic Wagon-sold
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2,297 Posts
Assuming that your meter does not filter out the actual O2 sensor voltage in a major way (meaning it really is slow to react to the O2 sensor going from very low voltage like 0.15V to aproximately 1.0V every 1-2 seconds I would say your lambda mixture control system is not functioning.
If this is the case, your issue around different behavior with the AC on/off compressor on/off might just be a secondary effect because the system is not responding like it should. This is just a wild guess on my part.
If I were you, I would first try to find out what is wrong with the O2 sensor system. I would like to help you there but honestly, with the exception of replacing the sensor twice in my car over the last 30 years / 200K miles, I have never had a non functioning O2 lambda control system. I suppose that is fortunate for me.
I'm hoping other members who have more experience with this can pitch in.
- Cheers!
If this is the case, your issue around different behavior with the AC on/off compressor on/off might just be a secondary effect because the system is not responding like it should. This is just a wild guess on my part.
If I were you, I would first try to find out what is wrong with the O2 sensor system. I would like to help you there but honestly, with the exception of replacing the sensor twice in my car over the last 30 years / 200K miles, I have never had a non functioning O2 lambda control system. I suppose that is fortunate for me.
I'm hoping other members who have more experience with this can pitch in.
- Cheers!