P0135
HO2S Heater Circuit
Malfunction (Bank 1, Sensor 1)
• Blown or missing HO2S fuse
• Short to battery between front HO2S and ECM
• Open between front HO2S and ECM
• Faulty front HO2S
P0030
HO2S Heater Control Circuit
(Bank 1, Sensor 1)
• Contaminated, deteriorated or aged HO2S
• Heater Resistance out of Reasonable Range
• Misplaced, bent, loose or corroded connector terminals
• Faulty HO2S
P0031
HO2S Heater Circuit Low (Bank
1, Sensor 1)
• Blown or mission HO2S fuse
• Open or short to GND between HO2S and ECM
• Faulty HO2S
P0032
HO2S Heater Circuit High (Bank
1, Sensor 1)
• Short to battery between HO2S and ECM
• Faulty HO2S
P0136
HO2S Circuit Malfunction (Bank
1, Sensor 2)
• Short between rear HO2S and ECM
• Faulty rear HO2S
P0137
HO2S Circuit Low Input (Bank
1, Sensor 2)
• Short to GND between HO2S and ECM
• Faulty front HO2S
P0138
HO2S Circuit Low Input (Bank
1, Sensor 2)
• Open or short to battery between HO2S and ECM
• Faulty front HO2S
P0139
HO2S Circuit Slow Responsive
(Bank 1, Sensor 2)
• Front and rear HO2S connections reversed
• Faulty fuel delivery system
• Leak in intake system
• Leak in exhaust system
• Faulty MAFS ground circuit
• Faulty HO2S
If any misfire, purge solenoid valve, MAFS or HO2S heater
codes are present,do all repairs associated with those codes
before proceeding with this troublearea.
P0140
HO2S Circuit No Activity
Detected (Bank 1, Sensor 2)
• Contaminated, deteriorated or aged HO2S
• Misplaced, bent, loose or corroded connector terminals
• Faulty HO2S
If any misfire, purge solenoid valve or HO2S heater codes are
present, do all repairs associated with those codes before
proceeding with this trouble area.
P0141
HO2S Heater Circuit
Malfunction (Bank 1, Sensor 2)
• Blown or missing HO2S fuse
• Short to battery between rear HO2S and ECM
• Open between rear HO2S and ECM
• Faulty rear HO2S
P0037
HO2S Heater Circuit Low (Bank
1, Sensor 2)
• Blown or missing HO2S fuse
• Open or short to GND between HO2S and ECM
• Faulty HO2S
P0038
HO2S Heater Circuit High (Bank
• Short to battery between HO2S and ECM
Page 6 of 14
24.04.2008
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