GM 12622975
Catalytic Converter, Driver Side

The left side Catalytic Converter (LP1, LY7) replacement process starts with deinstalling the left bank exhaust manifold heat shield together with the Catalytic Converter nuts. Support your vehicle while you move to disconnect electrical connectors from oxygen sensors as well as remove pipes between converters on both the left and right sides. Use a socket wrench to remove Exhaust Pipe nuts at the right bank Catalytic Converter position then extract the converter assembly following removal of its seal/heat shield and Oxygen Sensor from the exhaust manifold. Narrow down the sequence by taking off the Oxygen Sensor from its position on the Catalytic Converter. The installation process begins with attaching the Oxygen Sensor onto the Catalytic Converter while you evaluate the Catalytic Converter seal/heat shield sealing surface for wear and necessary replacements. Thread the Catalytic Converter's seal/heat shield onto its surface before repositioning the converter onto the exhaust manifold and tightening it with converter nuts. After reconnecting the Oxygen Sensor electrical connector check the Catalytic Converter seals so replace them if damage is present. You should install each Exhaust Pipe with its respective nuts on both sides of the catalytic converters until the torque reaches 22 n.m (16 lb ft). Set the vehicle height while securing Catalytic Converter exhaust manifold nuts at 50 n.m (37 lb ft) until you can install the right bank exhaust manifold heat shield.

Attach the oxygen sensor to the catalytic converter.

Tighten the catalytic converter to exhaust manifold nuts to 50 Nm (37 ft. lbs.), then reinstall the right bank exhaust manifold heat shield.

Place a NEW seal on the left side catalytic converter flange and a NEW gasket over the right side catalytic converter studs.

Reconnect the oxygen sensor electrical connector and check the catalytic converter seal, replacing it if necessary.