GM Service Manual Online
For 1990-2009 cars only

Catalytic Converter Replacement - Left Side With Cab Chassis

Removal Procedure


    Object Number: 1875589  Size: SH
  1. Remove the exhaust temperature sensors. Refer to Exhaust Temperature Sensor Replacement - Position 1 and Exhaust Temperature Sensor Replacement - Position 2.
  2. Remove the exhaust pressure differential sensor pipe. Refer to Exhaust Pressure Differential Sensor Pipe Replacement.
  3. Remove the catalytic converter to exhaust particulate filter nuts (1).

  4. Object Number: 1875590  Size: SH
  5. Remove the exhaust particulate filter hangers from the exhaust insulators (1).

  6. Object Number: 1875591  Size: SH
  7. Remove the exhaust particulate filter (1).
  8. Remove and discard the catalytic converter to particulate filter gasket (2).

Installation Procedure


    Object Number: 1875591  Size: SH
  1. Install a NEW gasket (2) onto the exhaust particulate filter studs.
  2. Install the exhaust particulate filter (1) to the catalytic converter.

  3. Object Number: 1875590  Size: SH
  4. Install the exhaust particulate filter hangers to the exhaust insulators (1).
  5. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1875589  Size: SH
  6. Install the exhaust particulate filter to catalytic converter nuts (1) and tighten to 45 N·m (33 lb ft).
  7. Install the exhaust pressure differential sensor pipe. Refer to Exhaust Pressure Differential Sensor Pipe Replacement.
  8. Install the exhaust temperature sensors. Refer to Exhaust Temperature Sensor Replacement - Position 1 and Exhaust Temperature Sensor Replacement - Position 2.
  9. Using a scan tool, perform the DPF Reset For Replace DPF.