GM Service Manual Online
For 1990-2009 cars only

Catalytic Converter Replacement LAT, LE5

Removal Procedure


    Object Number: 1885654  Size: SH
  1. Remove the heated oxygen sensor. Refer to Heated Oxygen Sensor 2 Replacement .
  2. Remove the catalytic converter to exhaust manifold nuts (1).

  3. Object Number: 1885660  Size: SH
  4. Remove the catalytic converter to muffler nuts (1).
  5. Separate the exhaust pipe from the catalytic converter studs.
  6. Position and support the exhaust pipe out of the way.
  7. Remove the catalytic converter (2) and gasket.

Installation Procedure


    Object Number: 1885660  Size: SH
  1. Install the catalytic converter (2) 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.
  5. Tighten
    Tighten the catalytic converter to muffler nuts to 17 N·m (13 lb ft).


    Object Number: 1885654  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 .

Removal Procedure


    Object Number: 1885654  Size: SH
  1. Remove the heated oxygen sensor. Refer to Heated Oxygen Sensor 2 Replacement.
  2. Remove the catalytic converter to exhaust manifold nuts (1).

  3. Object Number: 1885660  Size: SH
  4. Remove the catalytic converter to muffler nuts (1).
  5. Separate the exhaust pipe from the catalytic converter studs.
  6. Position and support the exhaust pipe out of the way.
  7. Remove the catalytic converter (2) and gasket.

Installation Procedure


    Object Number: 1885660  Size: SH
  1. Install the catalytic converter (2) along with a NEW gasket to the exhaust manifold.
  2. Position and join the exhaust pipe to the catalytic converter studs.
  3. Caution: Refer to Fastener Caution in the Preface section.

  4. Install the catalytic converter to muffler nuts and tighten to 17 N·m (13 lb ft).

  5. Object Number: 1885654  Size: SH
  6. Install the catalytic converter to exhaust manifold nuts (1) and tighten to 50 N·m (37 lb ft).
  7. Install the heated oxygen sensor. Refer to Heated Oxygen Sensor 2 Replacement.