P1159
Air/Fuel Ratio Sensor 1 AFS+ Terminal Low Voltage
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$33–89 (est.)
Symptoms
- Increased fuel consumption
- Unstable engine operation at idle
- Loss of engine power
- Check Engine Light Illuminates
- Increased emissions of harmful substances
Causes
- Open or short circuit in the sensor circuit
- Air/fuel ratio sensor malfunction
- Poor contact in the sensor connector
- Problems with sensor ground
- Engine ECU malfunction
How to Fix
- Check the integrity of the wiring to the sensor
- Check the connections in the sensor connector
- Measure resistance and voltage at the sensor
- Replace air/fuel ratio sensor if necessary
- Check and, if necessary, replace the engine ECU