SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 368 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSCATALYTIC CONVERTER REPLACEMENT (LFA)REMOVAL PROCEDURE
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Removal Procedure

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Removal Procedure
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Refer to Three-Way Catalytic Converter Damage Notice .
    Fig 1: View Of Oil Pan Skid Plate & Bolts
    GM1698082Courtesy of GENERAL MOTORS CORP.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the oil pan skid plate, if equipped. Refer to Oil Pan Skid Plate Replacement (2500/3500 with RPO NZZ) or Oil Pan Skid Plate Replacement (1500 with RPO NZZ) .
  3. Remove the transmission crossmember. Refer to Transmission Support Crossmember Replacement (4WD 2500 series) or Transmission Support Crossmember Replacement (2WD 1500 series) or Transmission Support Crossmember Replacement (2WD 2500 series) or Transmission Support Crossmember Replacement (4WD 1500 series) .
  4. Disconnect the heated oxygen (HO2S) sensor harness connectors. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 , Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 , Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .
    5. Fig 2: View Of Catalytic Converter To Exhaust Manifold Nuts & Exhaust Seals
    GM1708626Courtesy of GENERAL MOTORS CORP.
  5. Remove the catalytic converter pipe to the exhaust manifold nuts (1).
    6. Fig 3: View Of Catalytic Converter To Muffler Nuts (RPO L92)
    GM1708979Courtesy of GENERAL MOTORS CORP.
  6. Remove the catalytic converter pipe to the resonator pipe nuts.
    7. Fig 4: Band Clamp & Bolt
    GM1972642Courtesy of GENERAL MOTORS CORP.
  7. If equipped with the Norma (band) clamp, remove the band clamp bolt (1).
  8. Remove the catalytic converter pipe from the vehicle.
  9. Remove the exhaust seals (2 and 3) and discard.
    10. Fig 5: View Of Catalytic Converter Assembly HO2S's
    GM1704008Courtesy of GENERAL MOTORS CORP.
  10. Remove the HO2S sensors (1 through 5) from the catalytic converter assembly.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.