P04C4

Fuel Fill Door Lock Position Sensor/Switch Circuit Range/Performance

Severity

✅ Low

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–89 (est.)

Symptoms

Check Engine Light Is On
Problems with opening/closing the fuel filler flap
EVAP system errors

Causes

Malfunction of the fuel tank flap position sensor
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Engine control unit malfunction

How to Fix

Check the continuity of the sensor circuit (wire harness)
Clean or replace sensor connector if necessary
Check sensor resistance (according to manufacturer's specifications)
Replace the sensor if it is faulty
Reset the error and check if it returns

Related codes

P0455 P0442 P0440