This STS Parts 4.2 bar fuel pressure regulator is designed as a direct replacement for OEM regulators used on a wide range of 1996–2006 GM platforms, including popular trucks, vans, SUVs and passenger cars. It restores proper fuel rail pressure to help eliminate common drivability issues such as hard starting, hesitation, rough idle or poor fuel economy caused by a weak or leaking regulator. The unit is engineered to meet or exceed OE performance, with precise pressure control, quality internal components and a durable housing for long service life in demanding under-hood conditions. This regulator replaces a large number of factory and aftermarket part numbers, making it a convenient solution when servicing high-mileage vehicles or completing a full fuel system refresh. Important: This is a vehicle-specific component. Please use your vehicle's year, make, model and engine to confirm compatibility before purchase. ✅ Interchange / Cross-Reference Numbers OEM / OE-Equivalent References (Fuel Pressure Regulator / Fuel Injection Pressure Regulator): 17113203, 19106768, 19210686, 89017453, 89060422, 88894356, 1722592 5G1069, 5G1404, 158-0730, 23043, 21091, 143-437, PR203, PR4008, PR4060, PR155, PR122, FP10021, FP10075, FP10235 8-12574-986-0, 8-17113-203-0, 8-17113-536-0, 8-17113-678-0, 8-17113203-0, 8-89017-453-0, 8-89060-420-0, 8-89060-422-0 8125749860, 8171132030, 8171135360, 8171136780, 8890174530, 8890604200, 8890604220 (Use these numbers to match against the part on your vehicle or in your catalog.) ✅ Vehicle Coverage Summary (Condensed) Used on many 1996–2006: Full-size & Mid-size Trucks / SUVs / Vans: Astro, Safari, S10/Sonoma, C/K-Series, Silverado/Sierra 1500/2500/3500 & HD, Tahoe, Suburban, Express/Savana, Avalanche, Trailblazer/Envoy, and related platforms with 4.3L, 4.8L, 5.0L, 5.3L, 5.7L, 6.0L, 7.4L, 8.1L gas and 6.5L diesel engines (including some CNG/bi-fuel variants). Passenger Cars & SUVs: LeSabre, Park Avenue, Regal, Impala, Monte Carlo, Rainier and others equipped with 3.4L & 3.8L V6 (naturally aspirated and supercharged, depending on calibration). Because coverage is extensive, customers should always verify using year, engine and existing part number. ✅ What's Included 1 × Fuel Pressure Regulator (4.2 bar)