What does it mean?
P1169 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Lean A/F Sensor (Bank 1 Sensor 1) Label Circuit High Input .
Symptoms
- Check engine light on
- Engine may fall back to a default fuelling strategy with dull throttle response
- Idle quality slightly worse than normal
- Fuel consumption above average
- Emissions monitors stay incomplete
Likely causes
- Open circuit in the calibration wire between sensor and module: broken conductor or a terminal backed out of the connector
- Sensor unplugged or not fully latched after previous work
- Internal open in the sensor calibration resistor
- Short to battery voltage where the harness has chafed against a supply wire
- Corroded, dry or heat-damaged connector pins raising circuit resistance
- Rarely, a control module input fault
How to fix it
- Verify that the sensor connector is fully seated and latched, and that no terminal has pushed back
- Measure calibration circuit voltage at the harness connector with the ignition on and compare with the expected reference
- Check continuity of the calibration wire from the sensor connector to the module pin
- Test the same wire for a short to battery voltage with everything disconnected
- Inspect the harness where it passes heat sources and moving parts for breaks under the insulation
- Repair the open or short, secure the harness away from heat, and clear the code
- Replace the sensor if its calibration resistance measures open