GM Service Manual Online
For 1990-2009 cars only

Catalytic Converter Replacement LAT

Removal Procedure

Caution: Refer to Exhaust Service Caution in the Preface section.

Caution: Refer to Protective Goggles and Glove Caution in the Preface section.

  1. Remove the heated oxygen sensor. Refer to Heated Oxygen Sensor 2 Replacement.

  2. Object Number: 2018062  Size: SH
  3. Remove the catalytic converter to exhaust manifold nuts (1).

  4. Object Number: 2094213  Size: SH
  5. Remove the catalytic converter to muffler nuts (1).
  6. Separate the exhaust pipe from the catalytic converter studs.
  7. Position and support the exhaust pipe out of the way.
  8. Remove the catalytic converter and gasket.

Installation Procedure


    Object Number: 2094213  Size: SH
  1. Install the catalytic converter along with a NEW gasket to the exhaust manifold.
  2. Position and join the exhaust pipe to the catalytic converter studs.
  3. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the catalytic converter to muffler nuts (1).
  5. Tighten
    Tighten the catalytic converter to muffler nuts to 17 N·m (13 lb ft).


    Object Number: 2018062  Size: SH
  6. Install the catalytic converter to exhaust manifold nuts (1).
  7. Tighten
    Tighten the nuts to 50 N·m (37 lb ft).

  8. Install the heated oxygen sensor. Refer to Heated Oxygen Sensor 2 Replacement.

Catalytic Converter Replacement LE5 With MH8

Removal Procedure

Caution: Refer to Protective Goggles and Glove Caution in the Preface section.

Caution: Refer to Exhaust Service Caution in the Preface section.

  1. Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement.
  2. Remove the catalytic converter to exhaust manifold nuts.
  3. Raise and suppore the vehicle. Refer to Lifting and Jacking the Vehicle
  4. Remove the heated oxygen sensor. Refer to Heated Oxygen Sensor 2 Replacement.

  5. Object Number: 2081577  Size: SH
  6. Remove the catalytic converter to muffler nuts (1).
  7. Separate the exhaust pipe (2) from the catalytic converter studs.
  8. Position and support the exhaust pipe (2) out of the way.

  9. Object Number: 2081582  Size: SH
  10. Remove the converter to bracket bolt (1).
  11. Remove the catalytic converter (2) and gasket. Discard the Catalytic converter gaskets.

Installation Procedure


    Object Number: 2081582  Size: SH
  1. Install a NEW gasket to the catalytic converter.
  2. Position the catalytic converter (2) to the exhaust manifold and converter bracket.
  3. Loosley install the converter to manifold nuts (3) and converter bracket bolt (1).
  4. Notice: Refer to Fastener Notice in the Preface section.

  5. Tighten the Converter to bracket bolt to 30 N·m (22 lb ft).

  6. Object Number: 2081577  Size: SH
  7. Install a NEW gasket between the converter and exhaust pipe (2).
  8. Connect the exhaust pipe to the converter and tighten the nuts (1) to 25 N·m (18 lb ft).
  9. Install the heated oxygen sensor. Refer to Heated Oxygen Sensor 2 Replacement.
  10. Lower the vehicle
  11. Tighten the converter to manifold nuts to 25 N·m (18 lb ft).
  12. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement.