KlaroP0170
MODERATEFuel Trim Malfunction (Bank 1)
What this code means
Fuel Trim Malfunction (Bank 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
- 70P0170
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
- P0171System Too Lean (Bank 1)
- P0172System Too Rich (Bank 1)
- P0173Fuel Trim Malfunction (Bank 2)
- P0174System Too Lean (Bank 2)
- P0175System Too Rich (Bank 2)
- P0176Fuel Composition Sensor Circuit Malfunction
- P0177Fuel Composition Sensor Circuit Range/Performance
- P0178Fuel Composition Sensor Circuit Low Input