{"product_id":"mercedes-kraftstoffpumpenrelais-kpr-0035451205-kr0003-relais-ke-jetronic-gepruft","title":"Mercedes Fuel Pump Relay KPR 0035451205 KR0003 Relay KE-Jetronic Tested","description":"\u003cdiv style=\"background:#242833;border-radius:8px;padding:18px 20px;margin:0 0 14px;color:#ffffff;\"\u003e\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong style=\"color:#c69a3a;\"\u003eGenuine fuel pump relay (KPR) 003 545 12 05 \/ KR0003 for Mercedes vehicles with KE-Jetronic.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;color:#cfd3dc;\"\u003eGenuine spare part  ·  Personally function-tested  ·  \u003cstrong style=\"color:#c69a3a;\"\u003eControl electronics instead of a simple switching relay\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin:0 0 16px;\"\u003e\n\u003cspan style=\"display:inline-block;background:#f5f6f8;border:1px solid #e3e5e9;border-radius:999px;padding:5px 12px;margin:0 6px 6px 0;font-size:14px;\"\u003e✓ Function tested\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cdiv style=\"background:#f5f6f8;border-left:4px solid #c69a3a;border-radius:8px;padding:14px 18px;margin:0 0 16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;\"\u003eCondition of this part\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eUsed genuine part, personally tested and functional. The housing shows light scratches on the ribbed top and a small paint mark on one edge; the plug contacts are slightly tarnished from age. All pins are present and straight, with no breaks or cracks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eFunction and location\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eThe KPR is not a simple switching relay but a small piece of control electronics: it pre-runs the fuel pump for about 2 seconds when the ignition is switched on, keeps it active during cranking and while the engine is running, and switches it off as a safety measure when the engine is stopped. Depending on the version, this series also controls the cold start valve and the oxygen sensor heater and handles rev limiting.\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eThe relay is installed in the control unit\/electronics box in the engine bay (plenum chamber), next to the injection control units.\u003c\/p\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eHow can you tell if a fuel pump relay is faulty?\u003c\/h3\u003e\n\u003cul style=\"margin:0 0 16px;padding-left:20px;\"\u003e\n\u003cli\u003eEngine doesn't start because the fuel pump doesn't run\u003c\/li\u003e\n\u003cli\u003eEngine stalls sporadically\u003c\/li\u003e\n\u003cli\u003eMisfires while driving\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eCompatible vehicles\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eAccording to repair documentation, assigned to the W124 family from the KE-Jetronic era (manual transmission version, 1980s model series). The number is no longer listed in current catalogs – so before buying, please be sure to compare the part number on your old part; the relay is only guaranteed to fit if the number is identical.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 16px;\"\u003e\u003cstrong\u003ePart numbers:\u003c\/strong\u003e Mercedes-Benz 003 545 12 05 (also written as 0035451205), listed internally as KPR (fuel pump relay) KR0003. Not to be confused with 003 545 13 05, 003 545 19 05, 003 545 20 05, 002 545 21 05 (M102 group) or 003 545 24 05, 002 545 92 05 (M103 group) – these do NOT fit this item.\u003c\/p\u003e\n\u003cdiv style=\"background:#f5f6f8;border-left:4px solid #c69a3a;border-radius:8px;padding:14px 18px;margin:0 0 16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;\"\u003e⚠ Important: compare the part number before buying\u003c\/p\u003e\n\u003cp style=\"margin:0 0 6px;\"\u003eThe number 003 545 12 05 is decisive for compatibility and is no longer listed in current catalogs. Repair documentation assigns it to the W124 family from the KE-Jetronic era (manual transmission version, 1980s model series). Before buying, please be sure to compare the part number on your old part.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 4px;font-weight:700;\"\u003eDoes not fit:\u003c\/p\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003eKPR 003 545 13 05, 003 545 19 05, 003 545 20 05, 002 545 21 05 (M102 group)\u003c\/li\u003e\n\u003cli\u003eKPR 003 545 24 05, 002 545 92 05 (M103 group)\u003c\/li\u003e\n\u003cli\u003eAs a general rule: Mercedes fitted different KPR versions for each engine\/transmission combination – always check against the part number\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin:0 0 16px;\"\u003e\u003cstrong\u003eDoes this part fit your car?\u003c\/strong\u003e Send us the VIN (chassis number) and model year – we'll check it for free: \u003ca href=\"tel:+491798991069\"\u003e0179 8991069\u003c\/a\u003e (Mon–Fri 8 am–6 pm) or via our \u003ca href=\"\/en\/pages\/contact?thema=Ersatzteil\"\u003econtact form\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eFAQ\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 4px;\"\u003e\u003cstrong\u003eIs the relay tested?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eYes, it has been personally function-tested and works flawlessly. The housing shows only light signs of use, such as scratches on the ribbed top and a small paint mark on one edge.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 4px;\"\u003e\u003cstrong\u003eIs the relay guaranteed to fit my vehicle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eOnly if the part number 003 545 12 05 matches your old part exactly. Mercedes fitted different KPRs depending on the engine\/transmission version, and this number can no longer be checked against current catalogs.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 4px;\"\u003e\u003cstrong\u003eHow can I tell a KPR is defective?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eTypical signs are an engine that doesn't start because the fuel pump doesn't run, as well as sporadic stalling or misfires while driving.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRelated categories:\u003c\/strong\u003e \u003ca href=\"\/en\/collections\/relais\"\u003eRelays\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKFZTeile-Thot\u003c\/strong\u003e specialises in spare parts for Mercedes classic cars. Free shipping within Germany, 60-day return policy.\u003c\/p\u003e","brand":"Mercedes-Benz","offers":[{"title":"Default Title","offer_id":54984556609865,"sku":"60771","price":99.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0913\/5344\/8777\/files\/57_ce2c9025-0a62-46d4-b9c5-ee462b321d76.jpg?v=1787304489","url":"https:\/\/kfzteile-thot.de\/en\/products\/mercedes-kraftstoffpumpenrelais-kpr-0035451205-kr0003-relais-ke-jetronic-gepruft","provider":"KFZTeile-Thot","version":"1.0","type":"link"}