P1159
Air/Fuel Ratio Sensor 1 AFS+ Terminal Low Voltage
P1159 is an OBD-II diagnostic trouble code meaning: Air/Fuel Ratio Sensor 1 AFS+ Terminal Low Voltage. Common causes: open or short circuit in the sensor circuit, air/fuel ratio sensor malfunction. Estimated repair cost: $33–89.
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
Related codes
Error P1159 by Vehicle Brand
FAQ
What does the P1159 code mean?
P1159 is an OBD-II diagnostic trouble code that indicates: Air/Fuel Ratio Sensor 1 AFS+ Terminal Low Voltage
What causes a P1159 error code?
The most common causes of P1159 include: Open or short circuit in the sensor circuit; Air/fuel ratio sensor malfunction; Poor contact in the sensor connector; Problems with sensor ground.
How do I fix a P1159 diagnostic trouble code?
To fix P1159: Check the integrity of the wiring to the sensor. Check the connections in the sensor connector. Measure resistance and voltage at the sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1159?
Yes, but get it checked soon
How much does it cost to fix P1159?
The estimated repair cost for P1159 is $33–89. Actual cost depends on your vehicle, location, and labor rates.
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