CUSTOMER CONCERN DTCs P0171, P0441, P0455, and P3191 set intermittently, with freeze-frame data showing high idle fuel trim like a vacuum leak. CAUSE The EVAP canister purge solenoid intermittently stuck open, creating an unmetered-vapor vacuum path that drove the lean and EVAP faults. CORRECTION Remove and replace the EVAP canister purge solenoid, clear DTCs P0171, P0441, P0455, and P3191, and verify normal idle fuel trim and EVAP-system operation.

CUSTOMER CONCERN After diesel fuel was mistakenly added, the engine only cranks or runs briefly and DTCs P0A0F, P3190 and P3191 are stored. CAUSE Diesel fuel remained in the gasoline fuel lines and prevented normal combustion. CORRECTION Drain the contaminated fuel, flush the fuel tank and lines, refill with gasoline, clear P0A0F, P3190 and P3191, and verify the engine starts and runs normally.