The electrical signal from the optical sensor must be clean going to the ECM
A dirty signal (Noise) will/can cause the computer to complain.....
Only the pass side battery?? I'm willing to bet that your issue is that your windshield drains directly onto the top of that battery. If it is a flat
Wolverine68 Yesterday, 16:16"Adding a fresh filter harness is not a bad idea either....." Thanks for the reply, Robyn....so I take it that you think this filter
rnash4 Yesterday, 09:50Hi
The harness you refer to can cause issues.
The OBD2 systems did not use it....
Yes there is a lot of BS out there.
Optical Sensor Filter Harness
I have not had a filter harness on my 1995 Tahoe for many years now. No ill side effects that I have been able to notice.
arveetek Today, 06:16Casey