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P0325 Knock Sensor Circuit • Open or short to GND between knock sensor and ECM • Source of high resistance between knock sensor and ECM • Faulty knock sensor P0330 Knock Sensor Circuit P0335 Crankshaft Position Sensor • Short to GND between CKP sensor and ECM • Open or short to battery between CKP and ECM • Short between CKP sensor wires • Poor connection between CKP connector & harness connector • Out of allowable air gap • Faulty target wheel tolerance • Faulty CKP sensor P0340 Camshaft Position Sensor • Short to GND between CMP sensor and ECM • Open or short to battery between CMP and ECM • Short between CMP sensor wires • Poor connection between CMP connector & harness connector • Faulty CMP sensor P0420 Main catalyst efficiency • Catalytic converter deteriorated If any codes relating to HO2S sensor. MAFS, injectors, a P0430 Main catalyst efficiency • Catalytic converter deteriorated If any codes relating to HO2S sensor. MAFS, injectors, P0171, P0441 EVAP Emission Control System • Stuck in valve open position P0442 EVAP Emission Control System • Fuel filler cap loose or missing • Fuel filler cap o-ring missing or damaged • Faulty or damaged fuel filler pipe • Leaking, disconnected or plugged fuel vapor lines • Fuel in lines due to faulty rollover valve, on-board refueling vapor recoveryvalve or stuck closed CCV • Canister close valve clogged, struck open or closed • Improperly installed purge solenoid valve • PSV stuck open or closed • Faulty fuel tank pressure sensor • Leaking canister or catch tank If any codes relating to FTPS, CCV or PSV circuits are present, |