Fuel Injector Seal O-Ring – 035-133-557A The 035-133-557A is a precision-engineered fuel injector seal O-ring used across a wide range of Volkswagen and Audi engines. Measuring 9.8 x 1.4 mm, this "small" O-ring is a critical component for maintaining the airtight integrity of the fuel injection system. It is specifically designed to seal the injector within its housing, preventing vacuum leaks that can lead to rough idling, poor fuel economy, and decreased engine performance. Given the high-heat environment of the engine block, these rubber seals naturally degrade, harden, and crack over time. When performing any service that involves removing the fuel injectors, it is standard practice to replace the 035-133-557A seals to ensure a leak-free reinstallation. This part is a direct OEM-spec replacement, maintaining the exact dimensions required for Bosch and other factory injection systems. Detailed Vehicle Compatibility Audi 80: 1988, 1989, 1990, 1991, 1992 Audi 80 Quattro: 1988, 1989, 1990, 1991, 1992 Audi 90: 1988, 1989, 1990, 1991 Audi 90 Quattro: 1988, 1989, 1990, 1991 Audi 100: 1989, 1990, 1991 Audi 100 Quattro: 1989, 1990, 1991 Audi 200: 1989, 1990, 1991 Audi 200 Quattro: 1989, 1990, 1991 Audi 4000: 1984, 1985, 1986, 1987 Audi 4000 Quattro: 1984, 1985, 1986, 1987 Audi 5000: 1985, 1986, 1987, 1988 Audi 5000 Quattro: 1986, 1987, 1988 Audi Coupe: 1985, 1986, 1987 Audi Coupe GT: 1985, 1986, 1987 VW Cabriolet: 1987, 1988, 1989 VW Fox: 1987, 1988, 1989, 1990 VW Golf: 1988, 1989, 1990, 1991, 1992 VW GTI: 1988, 1989, 1990, 1991, 1992 VW Jetta: 1988, 1989, 1990, 1991, 1992 VW GLI: 1988, 1989, 1990, 1991, 1992 VW Passat: 1990, 1991, 1992, 1993, 1994 VW Quantum: 1988 VW Scirocco: 1988 Product Highlights & Features Durable Rubber Compound: Manufactured from high-quality elastomers designed to resist oil, fuel, and extreme thermal cycling. Precision Sizing: Features a 9.8mm inner diameter and 1.4mm thickness for a perfect fit on factory fuel injectors. Airtight Performance: Engineered to eliminate unmetered air leaks at the injector base, ensuring consistent idle and smooth acceleration. Easy Installation: Designed for a simple "roll-on" fitment onto the injector body; no specialized tools are required for installation. Technical Specifications Part Number: 035-133-557A Interchange Part Numbers: 035133557A, 3430210603, W01331644236 Dimensions: 9.8mm x 1.4mm Material: Fuel-Resistant Elastomer (Nitrile/Viton) Installation & Maintenance Tips Visual Inspection: When removing old injectors, look for "squared-off" or brittle rubber. If the seal does not feel pliable, it is no longer providing an adequate vacuum seal. Light Lubrication: Before installing the new 035-133-557A O-ring, apply a very small drop of clean engine oil or fuel to the seal. This helps it slide into the injector seat without binding or tearing. Complete the Set: Many enthusiasts replace this "small" seal alongside the larger injector seal (035-133-557) to ensure the entire assembly is fully refreshed. Check the Shrouds: While the injectors are out, inspect the plastic injector shrouds for cracks. A new O-ring cannot compensate for a damaged plastic housing. 035133557A
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