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Pontiac 25057843 Catalytic Converter Assembly

1985-1987 Pontiac

Customer Questions & Expert Answers (3)
25057843 GM Catalytic Converter Assembly Illustration 1 of 1
  • Part Description
    Converter Assembly, Catalytic
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine Pontiac
    Manufacturer Part Number25057843
    Part DescriptionConverter Assembly, Catalytic
    Other NamesCatalytic Converter, Converter
    Item Dimensions47.0 x 9.0 x 10.0 inches
    Item Weight14.10 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU25057843
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    1985-1986 Pontiac Bonneville8 Cyl 5.0L2 DOOR, 4 DOOR, BROUGHAM 2 DOOR, LE 2 DOOR
    1985-1987 Pontiac Grand Prix8 Cyl 5.0L2 DOOR, 4 DOOR, BROUGHAM 2 DOOR, LE 2 DOOR
    1985-1986 Pontiac Parisienne8 Cyl 5.0L4 DOOR, BROUGHAM, STATION WAGON
  • Customer Questions & Expert Answers

    Q:
    I would like to confirm if this is the correct part number for my vehicle. Please advise. Thank you.
    A:
    You can Select Your Vehicle to check if 25057843 fits your vehicle.
    Posted and answered by GM Parts Specialist Henry
    Q:
    What can be done if the Catalytic Converter is ineffective of the 1986 Chevrolet El Camino? Posted by Jeran G.
    A:
    If the converter is ineffective, it can be replaced, or the coated beads can be drained and replaced. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Syed / Apr 24, 2023
    Q:
    What should be done after installing the new Catalytic Converter in the bead type converters of the 1986 Chevrolet Caprice? Posted by Verified Customer
    A:
    Finally, the converter should be installed, the engine started, and checked for leaks. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Fernando / Nov 09, 2025

Genuine GM Part 25057843, the Right Choice

To ensure reliability, purchase GM part # 25057843 Catalytic Converter Assembly. It is sometimes referred to as Pontiac Catalytic Converter. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Pontiac Bonneville, Grand Prix, Parisienne models.

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