KlaroP0131
MODERATEO2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
What this code means
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1). These codes concern the sensors that tell the control unit about the mixture: mass airflow, oxygen sensors, fuel trim corrections. They often point to an air leak or an ageing sensor rather than an outright failure.
How to read this code
- PPowertrain
- 0standardised code
- 1Fuel and air metering
- 31P0131
The letter P names the system: Powertrain. The digit 0 that follows marks a standardised code, shared by all manufacturers code. The next digit, 1, locates the fault: fuel and air metering.
What to do
Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.
Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back.
Nearby codes
- P0130O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
- P0132O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
- P0133O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
- P0134O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
- P0135O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
- P0136O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
- P0137O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
- P0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)