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Is there any way i can narrow down what to do?

P0135 - HO2S Sensor Circuit Malfunction (HO2S-11) During testing the HO2S Heaters are checked for opens/shorts and excessive current draw. The test fails when current draw exceeds a calibrated limit and/or an open or short is detected. Short to VPWR in harness or HO2S.
Water in harness connector.
Open VPWR circuit.
Open GND circuit.
Low battery voltage.
Corrosion or poor mating terminals and wiring
Damaged HO2S heater.
Damaged PCM.
wiring.
Damaged HO2S heater.
Damaged PCM.



po155


Quote:
P0155 - HO2S Sensor Circuit Malfunction (HO2S-21) See DTC P0135
 

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