Code Definition

P1161 — O2 Sensor Heater Control Circuit (Bank 2 Sensor 2)

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: GM

About P1161

P1161 is a manufacturer-specific powertrain diagnostic trouble code recorded for GM vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1161 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1161 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This General Motors specific code relates to the heater control circuit for the downstream oxygen sensor on Bank 2 Sensor 2, the sensor mounted after the catalytic converter on the second cylinder bank. The sensor carries an internal heating element that brings it up to operating temperature quickly and keeps it hot during light load driving, allowing the PCM to hold closed loop and run the catalyst monitor on that bank. The PCM controls and monitors this heater circuit, and P1161 sets when it detects the heater control circuit is open, shorted or drawing incorrect current. There is usually no...

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