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Home >> Cadillac >> 2003 >> Seville SLS >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Catalytic Converter Replacement >> Removal Procedure

Removal Procedure

  1. Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE  in General Information.
  2. Support the exhaust system near the resonator with a suitable jack.
  3. Remove the oxygen sensor. It is not necessary to disconnect the electrical connector.
  4. Remove the nuts securing the catalytic converter to the exhaust manifold pipe.
    Fig 1: Removing Nuts Securing Catalytic Converter To Exhaust Manifold Pipe
    G02071322Courtesy of GENERAL MOTORS CORP.
  5. Remove the bolts securing the center exhaust hangers to the rear suspension support brackets.
    Fig 2: Removing Bolts Securing Center Exhaust Hangers To Rear Suspension Support Brackets
    G02071323Courtesy of GENERAL MOTORS CORP.
  6. Remove the catalytic converter from the manifold pipe.
  7. Lower the exhaust system.
  8. Remove the catalytic converter gasket. Do not reuse the gasket.
    IMPORTANT: Ensure the cut (2) is made on the catalytic converter side of the pipe.
  9. Cut the catalytic converter (3) from the resonator inlet pipe (1) behind the step 2 but as close to the step as the tool will permit. The replacement catalytic converter will slide over the inlet pipe.
    Fig 3: Locating Cut Line On Resonator Inlet Pipe
    G02071324Courtesy of GENERAL MOTORS CORP.
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