Code Definition

P1163 — O2 Sensor Reading Lean or Low Voltage (Bank 2 Sensor 3)

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

About P1163

P1163 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 P1163 is stored, the module has detected a signal or supply voltage lower than the expected operating range; 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.

P1163 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 applies to the Bank 2 Sensor 3 oxygen sensor, a third sensor placed far down the exhaust on the second cylinder bank in vehicles that use an additional sensor after a further catalyst section. P1163 sets when the PCM sees the Sensor 3 signal biased toward lean, staying at a low voltage rather than the value expected from the exhaust at that point. A low or lean reading suggests a contaminated or aged sensor, an exhaust leak drawing in air ahead of the sensor, or a genuinely lean exhaust stream on that bank. Because Sensor 3 plays a supporting role in catalyst ...

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