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- DIAGNOSTICS SFI SYSTEM (1MZ-FE) 05-19 172 2002 LEXUS ES300 REPAIR MANUAL (RM911U) P0171 System too Lean (Fuel Trim) Air induction system Injector blockage Intake air flow meter E.F.I. engine coolant temp. sensor Fuel pressure Gas leakage on exhaust system Open or short in A/F sensor (bank 1, sensor 1) circuit A/F sensor (bank 1, sensor 1) PCV hose connection ECM P0172 System too Rich (Fuel Trim) Injector leak, blockage Intake air flow meter E.F.I. engine coolant temp. sensor Ignition system Fuel pressure Gas leakage on exhaust system Open or short in A/F sensor (bank 1, sensor 1) circuit A/F sensor (bank 1, sensor 1) PCV hose connection ECM P0174 System too Lean (Fuel Trim) Air induction system Injector blockage Intake air flow meter E.F.I. engine coolant temp. sensor Fuel pressure Gas leakage on exhaust system Open or short in A/F sensor (bank 2, sensor 1) circuit A/F sensor (bank 2, sensor 1) PCV hose connection ECM P0175 System too Rich (Fuel Trim) Injector leak, blockage Intake air flow meter E.F.I. engine coolant temp. sensor Ignition system Fuel pressure Gas leakage on exhaust system Open or short in A/F sensor (bank 2, sensor 1) circuit A/F sensor (bank 2, sensor 1) PCV hose connection ECM P0300 Random/Multiple Cylinder Misfire Open or short in engine wire Connector connection Vacuum hose connection Ignition system Injector Fuel pressure Intake air flow meter E.F.I. engine coolant temp. sensor Compression pressure Valve clearance Valve timing PCV hose connection ECM *2 |