O2 Sensor Circuit (Bank 1, Sensor 2)

Where it lives

For P0136, the circuit described runs through the sensor. The description of P0136 puts it on bank 1.

Check these first

• Failed downstream oxygen sensor
• Damaged wiring or connector
• Exhaust leak near the sensor
• Catalyst fault causing abnormal readings
• Contaminated sensor

What to do next

1. Inspect for exhaust leaks near the downstream sensor
2. Watch the downstream sensor voltage with a scan tool
3. Test the sensor signal and heater circuits
4. Check catalyst efficiency before blaming the sensor
5. Replace the sensor or catalyst as identified

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