2010 Cadillac CTS Sedan AWD V6-3.6L Page 1112

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1112



Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool))Alcohol/Contaminants-in-Fuel Diagnosis (without Special



Tool) (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General



Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool)).



* Evidence of water intrusion into the electrical connector of the HO2S



* The HO2S is loose



* Exhaust leaks near the HO2S



* Engine vacuum leaks



瀚慖f you find any of the above conditions, repair as necessary.



6. If all circuits/connections test normal, replace the appropriate HO2S sensor.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen



Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LLT) (See: Powertrain Management/Computers and



Control Systems/Oxygen Sensor/Service and Repair)



* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen



Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LLT) (See: Powertrain Management/Computers and



Control Systems/Oxygen Sensor/Service and Repair)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and



programming



P0161



DTC P0135, P0141, P0155, or P0161



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC P0135



- HO2S Heater Performance Bank 1 Sensor 1



DTC P0141



- HO2S Heater Performance Bank 1 Sensor 2



DTC P0155



- HO2S Heater Performance Bank 2 Sensor 1



DTC P0161



- HO2S Heater Performance Bank 2 Sensor 2



Diagnostic Fault Information



Circuit Description



The heated oxygen sensor (HO2S) heater reduces the time required for the oxygen sensor to reach operating temperature and maintains the

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