Hello, new here and couldn't find anything that is exact to this situation so hope im not duplicating threads.
2002 Silhouette 3.4
Engine light came on and van was running rough, stalling at start up until warm etc, used code reader and got P0135 and P0135 S. Change B1S1 O2 sensor with a cheap replacement. Cleared codes. Van now runs fine but engine light came right back on again.
Cleared codes again to try and monitor when the engine light would light up during the drive cycle. It seems to light up when is it to running the HO2S system. (no engine light is on when HO2S is in "not ready" state).
I tested van harness volts with multimeter and got 11.2. (C&D on van harness connector) (Not sure if I tested the ground properly though)
I tested new O2 sensor resistance (A&B side opposite the harness connector) and got 6.2ohms.
Not sure where to go from here and need to pass emission test.
Had water problems in the past (leaking through both sides of the roof)
Any help would be appreciated.
Thanks