Thread: P0135

P1135 HO2S Lean Average Bank 1 Sensor 1 - Read Our Article On Oxygen Sensor Codes For Help With This Pontiac Check Engine Light Code
Per https://www.engine-light-help.com/pontiac-check-engine-light.html

The HO2S 1 circuit, if open, should set a DTC P0134 and the scan tool will display a constant voltage between 400 - 500 mV. A constant voltage below 300 mV in the sensor circuit (circuit grounded) should set DTC P0131, while a constant voltage above 800 mV in the circuit should set DTC P0132. A fault in the HO2S 1 heater circuit should cause DTC P0135 to set. The PCM can also detect HO2S response problems. If the response time of an HO2S is determined to be too slow, the PCM will store a DTC that indicates degraded HO2S performance.

Per http://arrc.ebscohost.com/searches?car_uuid=1357130&fa_uuid=651a0810-93b2-012a-390c-fbaf6697d737&filters%5Bservice_information_type_pa th_facet%5D=root%2Fmrt%2Fsit%2Frepair&keywords=Oxy gen+Sensor

So this is the sensor on the engine block correct? Not on the exhaust near the cat?

Can anyone reference me ways to test if an O2 sensor is bad before I spend apparently 50$ on one?

Thanks.

Oops didn't realize I copied 1135. Thanks for catching my mistake.

Also thanks for letting me know which O2 sensor. I was scratching my head on that one.

Good thing I know where the O2 sensor that sits near spark plug #6. I haven't personally looked, seen, or replaced the one that's apparently near the CAT.

BTW 300 miles since the lower, upper intake repair. Running smooth other than this little problem. I'm glad you guys always have eyes on the forum!