{"product_id":"20741658-genuine-volvo®-engine-brake-air-valve-d12","title":"20741658 | Genuine Volvo® Engine Brake Air Valve D12","description":"\u003cp\u003e\u003cstrong\u003eDescription:\u003cbr\u003e\u003c\/strong\u003eAn Exhaust Air Pressure Valve (EAPV)\u003cstrong\u003e 20741658 \u003c\/strong\u003eis a valve used on some diesel engines to create backpressure in the exhaust system. The exact purpose depends on the engine and vehicle application. \u003cspan\u003eEngine Brake Air Valve\u003c\/span\u003e D12, 12V For Volvo Truck: VHD, VN, VT, Volvo Bus: B13R\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e: 20741658\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003cspan\u003e: New\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eManufacture\/Brand\u003c\/strong\u003e\u003cspan\u003e: Volvo\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFits 20741658 For \u003c\/strong\u003eVolvo Engine D12\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Truck: VHD, VN, VT\u003cbr\u003eVolvo Bus: B13R\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul id=\"catalogModels\" class=\"nav catalog\"\u003e\u003c\/ul\u003e\n\u003cp data-start=\"160\" data-end=\"353\"\u003e\u003cstrong\u003ePurpose of using 20741658:\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"1fc3rz8\" data-start=\"209\" data-end=\"576\"\u003e\n\u003cstrong data-start=\"212\" data-end=\"230\"\u003eEngine braking\u003c\/strong\u003e\n\u003cul data-start=\"234\" data-end=\"576\"\u003e\n\u003cli data-section-id=\"hu058s\" data-start=\"234\" data-end=\"340\"\u003eThe valve partially closes the exhaust flow when the driver activates the engine brake or exhaust brake.\u003c\/li\u003e\n\u003cli data-section-id=\"lv9iv2\" data-start=\"344\" data-end=\"443\"\u003eThis creates backpressure in the engine, helping slow the vehicle without using the wheel brakes.\u003c\/li\u003e\n\u003cli data-section-id=\"1c83g9j\" data-start=\"447\" data-end=\"576\"\u003eCommon on heavy-duty trucks such as those from \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eVolvo Trucks\u003c\/span\u003e\u003c\/span\u003e and \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eMack Trucks\u003c\/span\u003e\u003c\/span\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"ztv342\" data-start=\"578\" data-end=\"840\"\u003e\n\u003cstrong data-start=\"581\" data-end=\"606\"\u003eFaster engine warm-up\u003c\/strong\u003e\n\u003cul data-start=\"610\" data-end=\"840\"\u003e\n\u003cli data-section-id=\"xo2goj\" data-start=\"610\" data-end=\"677\"\u003eDuring cold starts, the valve can restrict exhaust flow slightly.\u003c\/li\u003e\n\u003cli data-section-id=\"a2enn6\" data-start=\"681\" data-end=\"766\"\u003eThis increases engine load and raises engine and exhaust temperatures more quickly.\u003c\/li\u003e\n\u003cli data-section-id=\"stt5vx\" data-start=\"770\" data-end=\"840\"\u003eFaster warm-up improves cabin heat and reduces cold-start emissions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"fuenl9\" data-start=\"842\" data-end=\"1104\"\u003e\n\u003cstrong data-start=\"845\" data-end=\"866\"\u003eEmissions control\u003c\/strong\u003e\n\u003cul data-start=\"870\" data-end=\"1104\"\u003e\n\u003cli data-section-id=\"17x6k2w\" data-start=\"870\" data-end=\"1035\"\u003eOn engines equipped with a \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eDiesel Particulate Filter\u003c\/span\u003e\u003c\/span\u003e (DPF), the valve helps raise exhaust temperatures for regeneration (burning off accumulated soot).\u003c\/li\u003e\n\u003cli data-section-id=\"1bvdv7k\" data-start=\"1039\" data-end=\"1104\"\u003eIt can also help manage exhaust gas flow for emissions systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"5qgska\" data-start=\"1106\" data-end=\"1343\"\u003e\n\u003cstrong data-start=\"1109\" data-end=\"1138\"\u003eImproved engine operation\u003c\/strong\u003e\n\u003cul data-start=\"1142\" data-end=\"1343\"\u003e\n\u003cli data-section-id=\"1x9rzmf\" data-start=\"1142\" data-end=\"1253\"\u003eSome engine management systems use exhaust pressure as part of their overall air-flow and emissions strategy.\u003c\/li\u003e\n\u003cli data-section-id=\"1z0djkn\" data-start=\"1257\" data-end=\"1343\"\u003eThe valve helps maintain desired pressure levels under certain operating conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-start=\"160\" data-end=\"353\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSigns of a Bad \u003cspan\u003eEngine Brake Air Valve\u003c\/span\u003e 20741658:\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\" style=\"width: 100.036%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 100%;\"\u003e\n\u003ch4 data-start=\"221\" data-end=\"254\"\u003e1. Weak or No Engine Braking\u003c\/h4\u003e\n\u003cul data-start=\"255\" data-end=\"444\"\u003e\n\u003cli data-section-id=\"4ujoqu\" data-start=\"255\" data-end=\"334\"\u003eEngine brake\/exhaust brake doesn't slow the vehicle as effectively as before.\u003c\/li\u003e\n\u003cli data-section-id=\"rprfmp\" data-start=\"335\" data-end=\"388\"\u003eVehicle gains speed more easily on downhill grades.\u003c\/li\u003e\n\u003cli data-section-id=\"6yd983\" data-start=\"389\" data-end=\"444\"\u003eOne of the most common symptoms on heavy-duty trucks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-start=\"446\" data-end=\"487\"\u003e2. Check Engine Light or Fault Codes\u003c\/h4\u003e\n\u003cp data-start=\"488\" data-end=\"525\"\u003eThe engine control module may detect:\u003c\/p\u003e\n\u003cul data-start=\"526\" data-end=\"633\"\u003e\n\u003cli data-section-id=\"1q2zi9e\" data-start=\"526\" data-end=\"554\"\u003eIncorrect exhaust pressure\u003c\/li\u003e\n\u003cli data-section-id=\"1v9c5jm\" data-start=\"555\" data-end=\"578\"\u003eValve position errors\u003c\/li\u003e\n\u003cli data-section-id=\"1l3sz97\" data-start=\"579\" data-end=\"604\"\u003eSolenoid circuit faults\u003c\/li\u003e\n\u003cli data-section-id=\"1e2v9mz\" data-start=\"605\" data-end=\"633\"\u003eAir system pressure faults\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-start=\"635\" data-end=\"663\"\u003e3. Loss of Engine Power\u003c\/h4\u003e\n\u003cp data-start=\"664\" data-end=\"712\"\u003eIf the valve is stuck partially or fully closed:\u003c\/p\u003e\n\u003cul data-start=\"713\" data-end=\"831\"\u003e\n\u003cli data-section-id=\"1g3f7yn\" data-start=\"713\" data-end=\"740\"\u003eEngine may feel sluggish.\u003c\/li\u003e\n\u003cli data-section-id=\"17nbp8m\" data-start=\"741\" data-end=\"761\"\u003ePoor acceleration.\u003c\/li\u003e\n\u003cli data-section-id=\"50sjfw\" data-start=\"762\" data-end=\"797\"\u003eReduced turbocharger performance.\u003c\/li\u003e\n\u003cli data-section-id=\"1heuma6\" data-start=\"798\" data-end=\"831\"\u003eIncreased exhaust backpressure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-start=\"833\" data-end=\"858\"\u003e4. Poor Fuel Economy\u003c\/h4\u003e\n\u003cp data-start=\"859\" data-end=\"942\"\u003eA malfunctioning valve can affect engine efficiency and emissions-system operation.\u003c\/p\u003e\n\u003ch4 data-start=\"944\" data-end=\"982\"\u003e5. Excessive Exhaust Backpressure\u003c\/h4\u003e\n\u003cp data-start=\"983\" data-end=\"1004\"\u003eSymptoms may include:\u003c\/p\u003e\n\u003cul data-start=\"1005\" data-end=\"1091\"\u003e\n\u003cli data-section-id=\"9y8686\" data-start=\"1005\" data-end=\"1035\"\u003eHigher exhaust temperatures.\u003c\/li\u003e\n\u003cli data-section-id=\"12ylmh4\" data-start=\"1036\" data-end=\"1061\"\u003eIncreased turbo stress.\u003c\/li\u003e\n\u003cli data-section-id=\"8t6bqs\" data-start=\"1062\" data-end=\"1091\"\u003eReduced engine performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-start=\"1093\" data-end=\"1143\"\u003e6. DPF Regeneration Problems (Diesel Engines)\u003c\/h4\u003e\n\u003cp data-start=\"1144\" data-end=\"1176\"\u003eOn vehicles equipped with a DPF:\u003c\/p\u003e\n\u003cul data-start=\"1177\" data-end=\"1292\"\u003e\n\u003cli data-section-id=\"1svlmpr\" data-start=\"1177\" data-end=\"1210\"\u003eFrequent regeneration requests.\u003c\/li\u003e\n\u003cli data-section-id=\"37c6uf\" data-start=\"1211\" data-end=\"1234\"\u003eFailed regenerations.\u003c\/li\u003e\n\u003cli data-section-id=\"eimigs\" data-start=\"1235\" data-end=\"1265\"\u003eIncreased soot accumulation.\u003c\/li\u003e\n\u003cli data-section-id=\"1me5mua\" data-start=\"1266\" data-end=\"1292\"\u003eDPF-related fault codes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-start=\"1294\" data-end=\"1311\"\u003e7. Air Leaks\u003c\/h4\u003e\n\u003cp data-start=\"1312\" data-end=\"1336\"\u003eFor air-operated valves:\u003c\/p\u003e\n\u003cul data-start=\"1337\" data-end=\"1442\"\u003e\n\u003cli data-section-id=\"60oqca\" data-start=\"1337\" data-end=\"1381\"\u003eHissing sounds near the valve or solenoid.\u003c\/li\u003e\n\u003cli data-section-id=\"r4b5cj\" data-start=\"1382\" data-end=\"1405\"\u003eLoss of air pressure.\u003c\/li\u003e\n\u003cli data-section-id=\"1pwz46n\" data-start=\"1406\" data-end=\"1442\"\u003eEngine brake works intermittently.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-start=\"1444\" data-end=\"1468\"\u003e8. Valve Stuck Open\u003c\/h4\u003e\n\u003cul data-start=\"1469\" data-end=\"1600\"\u003e\n\u003cli data-section-id=\"yo4x8q\" data-start=\"1469\" data-end=\"1500\"\u003eLittle or no exhaust braking.\u003c\/li\u003e\n\u003cli data-section-id=\"13s28np\" data-start=\"1501\" data-end=\"1539\"\u003eSlow engine warm-up in cold weather.\u003c\/li\u003e\n\u003cli data-section-id=\"1x49ndd\" data-start=\"1540\" data-end=\"1600\"\u003eReduced ability to raise exhaust temperatures when needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-start=\"1602\" data-end=\"1628\"\u003e9. Valve Stuck Closed\u003c\/h4\u003e\n\u003cp data-start=\"1629\" data-end=\"1658\"\u003eThis is usually more serious:\u003c\/p\u003e\n\u003cul data-start=\"1659\" data-end=\"1775\"\u003e\n\u003cli data-section-id=\"klkbp3\" data-start=\"1659\" data-end=\"1684\"\u003eSignificant power loss.\u003c\/li\u003e\n\u003cli data-section-id=\"1eclp94\" data-start=\"1685\" data-end=\"1703\"\u003eExcessive smoke.\u003c\/li\u003e\n\u003cli data-section-id=\"158zzu9\" data-start=\"1704\" data-end=\"1732\"\u003eHigh exhaust temperatures.\u003c\/li\u003e\n\u003cli data-section-id=\"wcntu6\" data-start=\"1733\" data-end=\"1775\"\u003eEngine may struggle to reach normal RPM.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eAbout the Manufacturer – \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eVolvo:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"0\" data-end=\"381\"\u003eVolvo is a Swedish multinational company known for manufacturing premium commercial vehicles, including trucks, buses, and construction equipment. Founded in 1927, Volvo is recognized globally for its commitment to safety, innovation, and environmental sustainability. The brand focuses on producing reliable, fuel-efficient, and technologically advanced trucks that serve industries such as transportation, logistics, and construction. Volvo's dedication to quality and cutting-edge technology has made it a trusted name in the heavy-duty vehicle market worldwide.\u003c\/p\u003e","brand":"Volvo","offers":[{"title":"Default Title","offer_id":50829503594743,"sku":"20741658","price":989.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/7080\/3959\/files\/23992701-genuine-volvo-air-valve-truck-to-trailer-1_1600x_e4ca8bf3-64ca-41e4-b9f9-4f822d6258cb.webp?v=1780450580","url":"https:\/\/forcetruckparts.com\/products\/20741658-genuine-volvo%c2%ae-engine-brake-air-valve-d12","provider":"Force Truck Parts","version":"1.0","type":"link"}