Make sure this part fits

GM 12511251 VALVE, Emission Control System

1991-1992 GM

Customer Questions & Expert Answers (3)
12511251 GM VALVE, Emission Control System
  • Part Description
    VALVE, Emission Control System
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number12511251
    Part DescriptionVALVE, Emission Control System
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU12511251
    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
    1991-1992 Chevrolet Lumina6 Cyl 3.4L2 DOOR, 4 DOOR
    1991-1992 Oldsmobile Cutlass6 Cyl 3.4L2 DOOR, 4 DOOR, INTERNAL 2 DOOR, INTERNAL 4 DOOR
    1991-1992 Pontiac Grand Prix6 Cyl 3.4L2 DOOR, 4 DOOR, GT 2 DOOR, LE 2 DOOR, LE 4 DOOR, SE 2 DOOR, SE 4 DOOR, STE 4 DOOR
  • Customer Questions & Expert Answers

    Q:
    I'm wondering if this is complete and correct part for my vehicle.
    A:
    You can Select Your Vehicle to check if 12511251 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    How are check valves and Diverter Valves removed and installed for the 1991 Oldsmobile Cutlass? Posted by Beryl B.
    A:
    Check valves are removed by disconnecting the air supply hose and using wrenches for careful removal, with installation being a reversal of the removal process. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Nicholas / Apr 30, 2025
    Q:
    What happens during deceleration in the AIR system, specifically regarding the Secondary Air Injection Check Valve, for the 1992 Pontiac Grand Prix? Posted by Jhony G.
    A:
    During deceleration, air is diverted to the atmosphere to prevent backfiring. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Jeremy / May 21, 2025

Genuine GM Part 12511251, the Right Choice

To ensure reliability, purchase GM part # 12511251 VALVE, Emission Control System. It is sometimes referred to as GM Air Inject Check Valve, GM Diverter Valve, GM Secondary Air Injection Check Valve. 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 Chevrolet Lumina models. It fits Oldsmobile Cutlass. It also fits Pontiac Grand Prix.

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