P0057
HO2S Heater Circuit Low (Bank
2, Sensor 2)
• Blown or missing HO2S fuse
• Open or Short to GND between HO2S and ECM
• Faulty HO2S
P0058
HO2S Heater Circuit High (Bank
2, Sensor 2)
• Short to battery between HO2S and ECM
• Faulty HO2S
P0171
Fuel System Too Lean (Bank 1)
• Faulty ignition system (Ignition coil/spark plug/Ignition cable)
• Faulty fuel delivery system (Fuel tank/Pressure
regulator/Canister purge valve)
• Clogged fuel injectors
• Faulty fuel injectors
• Leak in intake system
• Leak in exhaust system
• Faulty MAFS
If any codes relating to injectors, HO2S, ECTS or MAFS are
stored, do all repairs associated with those codes before
proceeding with this trouble area.
P0172
Fuel System Too Rich (Bank 1)
• Faulty fuel delivery system (Fuel tank/Pressure
regulator/Canister purge valve)
• Faulty fuel injectors
• Faulty MAFS
If any codes relating to injectors, HO2S, ECTS or MAFS are
stored, do all repairs associated with those codes before
proceeding with this trouble area.
P0174
Fuel System Too Lean (Bank 2)
• Faulty ignition system (Ignition coil/spark plug/Ignition cable)
• Faulty fuel delivery system (Fuel tank/Pressure
regulator/Canister purge valve)
• Clogged fuel injectors
• Faulty fuel injectors
• Leak in intake system
• Leak in exhaust system
• Faulty MAFS
If any codes relating to injectors, HO2S, ECTS or MAFS are
stored, do all repairs associated with those codes before
proceeding with this trouble area.
P0175
Fuel System Too Rich (Bank 2)
• Faulty fuel delivery system (Fuel tank/Pressure
regulator/Canister purge valve)
• Faulty fuel injectors
• Faulty MAFS
If any codes relating to injectors, HO2S, ECTS or MAFS are
stored, do all repairs associated with those codes before
Page 8 of 14
24.04.2008
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