Mercer OBD Trouble Code 31

park/neutral position (pnp) switch circuit

Wastegate solenoid - Circuit fault

EGR position sensor below minimum voltage

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.

Knock sensor (turbo models)