{"product_id":"catalytic-converter-for-volkswagen-passat-1998-2005-1-8l-front","title":"Catalytic Converter for Volkswagen Passat (1998-2005) 1.8L Front","description":"\u003ch2\u003eDirect-Fit Catalytic Converter for 1998-2005 Volkswagen Passat\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The catalytic converter replaces the degraded stock emissions core on the 1998-2005 Passat to restore proper exhaust velocity, clear P0420 diagnostic trouble codes, and maintain closed-loop air-fuel management.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Volkswagen Passat Catalyst Washcoat Degradation\u003c\/h3\u003e\n\u003cp\u003eOn the \u003cstrong\u003eB5\u003c\/strong\u003e and \u003cstrong\u003eB5.5\u003c\/strong\u003e platform, the longitudinal \u003cstrong\u003e1.8T (AEB\/ATW\/AUG\/AWM)\u003c\/strong\u003e runs elevated exhaust gas temperatures directly off the turbocharger turbine outlet. Over time, recurring heat cycling combined with blow-by vapors from aging PCV circuits causes washcoat poisoning and ceramic substrate thermal fractures. A choked factory catalytic converter generates excessive pre-turbine backpressure, which degrades wastegate actuation, spikes intake air temperatures, and triggers recurrent catalyst efficiency check engine lights.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eConstructed as a direct-fit replacement, this front catalytic assembly utilizes a high-grade stainless steel outer shell engineered to resist oxidation and thermal stress. The high-porosity ceramic substrate is coated with active precious-metal washcoats to ensure rapid light-off times and stoichiometric emissions reduction. Heavy-duty, laser-cut flanges mate seamlessly with the factory downpipe and mid-pipe mounting locations, preventing post-turbo exhaust leaks. Integrated, factory-oriented oxygen sensor ports allow the pre- and post-catalyst lambda probes to read accurate oxygen storage capacities without requiring harness extensions or ECU modification.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e1998-2005 Volkswagen Passat\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e1.8T 20V (AEB, ATW, AUG, AWM) \/ B5, B5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e150-170 hp \/ 155-166 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eDirect OE Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1998-2001 Volkswagen Passat GLS, GLX 1.8L L4 Turbo (B5 Platform)\u003c\/li\u003e\n  \u003cli\u003e2001.5-2005 Volkswagen Passat GLS 1.8L L4 Turbo (B5.5 Platform)\u003c\/li\u003e\n  \u003cli\u003eFits both FWD and 4Motion AWD configurations equipped with the 1.8L turbo engine\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the B5 and B5.5 Passat?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 1998-2005 Volkswagen Passat equipped with the 1.8T inline-four engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this direct replacement clear a P0420 catalyst system code?\u003c\/strong\u003e\u003cbr\u003e Yes, providing fuel trims and upstream O2 sensors operate within factory limits, the fresh substrate will restore target conversion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Volkswagen Precision Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet the stringent demands of German engineering, this direct-fit converter preserves proper backpressure profiles for OEM turbo response while preventing secondary air and post-cat O2 sensor fault codes. Note: EPA-compliant; not certified for sale or registration in California or CARB-restricted states.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50501706973432,"sku":"DS-EN93KSMSU","price":201.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-volkswagen-passat-1998-2005-1-8l-front-1.jpg?v=1789330140","url":"https:\/\/performancechiptuning.com\/es\/products\/catalytic-converter-for-volkswagen-passat-1998-2005-1-8l-front","provider":"Performance Chip Tuning","version":"1.0","type":"link"}