OEM 2009 Cadillac DTS Oxygen Sensor

2009 Cadillac DTS Parts Questions & Experts Answers

• Q: How to replace the Heated Oxygen Sensor (HO2S) for Bank 1 Sensor 1 on 2009 Cadillac DTS?

  A: The Heated Oxygen Sensor (HO2S) replacement procedure for Bank 1 Sensor 1 demands handling oxygen sensors with care to prevent damage while keeping both the electrical connector and exhaust inlet end clean of debris and avoiding the use of cleaning agents. Climinate the heated oxygen sensors through temperature threshold 48°C (120°F) for better access during removal. Start work by removing the fuel injector sight shield followed by disconnecting the HO2S from its electrical connector and the CPA retainer. Following this step remove the secondary air injection check valve hose bracket HO2S clip. Set the vehicle on a jack to lift it while maintaining support at the frame's rear section with a tall screw type jack. Begin by installing a screw type jack under the back of the frame to allow some slight drop before removing the HO2S. Old HO2S threads must receive anti-seize compound application from GM P/N 12377953 (or equivalent) before HO2S installation. After tightening the HO2S to 41 Nm (30 lb ft), carefully raise the engine frame to its position before installing the four rearward frame to body bolts which require a torque setting of 191 Nm (141 lb ft). After removing the screw type jack complete installation by reinstalling the HO2S clip onto the AIR check valve hose bracket then connect the engine harness electrical connector to the HO2S while installing the CPA retainer before placing back the fuel injector sight shield.