Hello,
P0139 - oxygen sensor downstream from catalytic converter slow response
P1135 - oxygen sensor heater circuit upstream from catalytic converter
So, both oxygen sensors are affected.
Regarding the slow responding oxygen sensor 2, is there perhaps an exhaust leak on the front exhaust pipe/exhaust manifold?
If so, have this seen to first.
P1135, heater circuit can be caused by a bad connection at the O2 sensor, no 12V supply to heater circuit, faulty heater or faulty heater control/ground from the ECM.
Pin out at upstream O2 sensor
Pin 1, yellow/white wire signal to ECM
Pin 2, green/yellow wire signal to ECM
Pin 3, pink/white wire heater circuit control to ECM
Pin 4, brown/white wire 12V supply from fuse F11 in engine fuse block
Oxygen sensor test
https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor
and
https://www.2carpros.com/articles/how-an-oxygen-sensor-works
and
https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor
I do not think that these O2 sensor issues will cause the non-start problem. They might cause the hesitation/stuttering issue.
Suggest to check and clean the main ground points in and around the engine compartment, battery terminals and connections at the engine fuse block
Hope this helps.
Cheers, Boris
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Thursday, October 19th, 2023 AT 9:21 AM