Aberdonia OBD Trouble Code 31

Knock sensor fault

EVAP Solenoid Circuit
Short or open in the EVAP solenoid circuit. Check for loose, broken, or shorted wire in the charcoal canister purge solenoid wiring and connectors.

Bad evaporator purge solenoid circuit or driver

park/neutral position (pnp) switch circuit

Pressure sensor circuit fault, voltage high