Code Definition

P1150 — Air/Fuel Sensor circuit range/performance

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

About P1150

P1150 is a manufacturer-specific powertrain diagnostic trouble code recorded for Lexus vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1150 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; 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.

P1150 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 Lexus uses a wideband air fuel ratio sensor in the Bank 2 exhaust ahead of the catalytic converter to measure the precise air fuel ratio for closed loop fuel control. The Engine Control Module (ECM) supplies the sensor and reads its output to trim fuel delivery on that bank. DTC P1150 sets when the ECM detects that the air fuel ratio sensor circuit signal on Bank 2 Sensor 1 is outside the expected range or responds too slowly to be plausible during normal operation. When the code is stored the engine may show poor fuel economy, hesitation, or rough running, and the ECM may revert to open ...

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