KlaroP0051
MODERATEHO2S Heater Control Circuit Low (Bank 2 Sensor 1)
What this code means
HO2S Heater Control Circuit Low (Bank 2 Sensor 1). This family covers the measurement of incoming air and injected fuel, together with the emission devices attached to them. A fault here distorts the mixture the engine burns, which costs fuel and raises emissions.
How to read this code
- PPowertrain
- 0standardised code
- 0Fuel and air metering, auxiliary emission controls
- 51P0051
The letter P names the system: Powertrain. The digit 0 that follows marks a standardised code, shared by all manufacturers code. The next digit, 0, locates the fault: fuel and air metering, auxiliary emission controls.
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
- P0050HO2S Heater Control Circuit (Bank 2 Sensor 1)
- P0052HO2S Heater Control Circuit High (Bank 2 Sensor 1)
- P0053HO2S Heater Resistance (Bank 1 Sensor 1)
- P0054HO2S Heater Resistance (Bank 1 Sensor 2)
- P0055HO2S Heater Resistance (Bank 1 Sensor 3)
- P0056HO2S Heater Control Circuit (Bank 2 Sensor 2)
- P0057HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
- P0058HO2S Heater Control Circuit High (Bank 2 Sensor 2)