OEM Cadillac STS Catalytic Converter

Cadillac STS Catalytic Converter Parts and Q&A

• Catalytic Converter, Driver Side
  19418949
  Q: How to replace the left side catalytic converter on Cadillac STS?

  A:

  Initially remove the left bank Exhaust Manifold heat shield when replacing the left side Catalytic Converter. After removing the Catalytic Converter nuts proceed by raising and supporting your vehicle. Both the left and right side catalytic converters require disconnecting their Oxygen Sensor electrical connectors and their muffler pipe attachments. Detach all Exhaust Pipe fasteners which serve to connect with the right bank Catalytic Converter. Use caution when removing the Catalytic Converter and its associated Oxygen Sensor from the Exhaust Manifold. Throw out both pieces because the inlet seal/heat shield should not return to service. Extract the sensor unit from the Catalytic Converter. First install an Oxygen Sensor onto the new Catalytic Converter while using fresh Catalytic Converter seal/heat shield components. Put the Catalytic Converter back on the Exhaust Manifold then fasten it using the Catalytic Converter nuts. After reconnecting the Oxygen Sensor electrical connector check the Catalytic Converter seals for wear and replace any damaged components. Tighten the muffler piping by securing it to both catalytic converters using a torque setting of 17 nm (13 lb ft). Lower the vehicle while tightening Catalytic Converter fasteners to Exhaust Manifold by 50 nm torque (37 lb ft). You should reinstall the right bank Exhaust Manifold heat shield as your last step.
• Catalytic Converter, Passenger Side
  19420108
  Q: How to replace the right side catalytic converter (LY7) on Cadillac STS?

  A:

  The replacement of right side Catalytic Converter (LY7) begins by removing the right bank exhaust manifold heat shield and Catalytic Converter nuts. Rise the vehicle and support it while you also extract the front driveshaft if your model has all wheel drive functionality. Use tools to disconnect both the Oxygen Sensor electrical connector and the muffler pipe from both left and right side catalytic converters. First remove the fasteners from the Exhaust Pipe leading to right bank Catalytic Converter before carefully extracting both the Catalytic Converter and Oxygen Sensor together with the seal/heat shield from the exhaust manifold. Remove the Oxygen Sensor which is connected to the Catalytic Converter. To begin with handle the Oxygen Sensor setup on the Catalytic Converter while examining the seal/heat shield's sealing surface for damage or wear then replace if necessary. Start by placing the Catalytic Converter within the exhaust manifold then secure it with fasteners after attaching both the heat shield and seal to the converter. Attach the Oxygen Sensor electrical wires while checking the Catalytic Converter seal for damage before replacing it as needed. Tighten the muffler nuts that attach the pipes to each side Catalytic Converter until they reach 22 n.m (16 lb ft) of torque. At this point if awd exists in the system the technician should reinstall the front driveshaft then lower the vehicle before applying 50 n.m (37 lb ft) of torque to the Catalytic Converter nuts. Finish your work by putting back the right bank exhaust manifold heat shield.