{"product_id":"volvo-780","title":"Volvo Penta Crankshaft Position Sensor 3858979","description":"\u003ch2\u003eVolvo Penta OEM Crankshaft Position Sensor – Part No. 3858979\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3858979\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eComponent Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCrankshaft Position Sensor (CKP)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSystem\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectronic Engine Control \/ Ignition System\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTiming-cover area — crankshaft sensing position\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eProvides engine-speed and crank-position signal to the ECM for ignition timing and fuel-delivery control\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuantity Per Engine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelated O-Ring\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3859009 (adjacent in applicable EFI diagrams)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 227 g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupersedes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo confirmed OEM superseding number — 3858979 is the current active number\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplaced By\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo documented replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAftermarket Cross-References\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSierra 18-7706 · CDI Electronics E13-0003 · Mallory 9-29820 · GM\/MerCruiser ref. 864297 \/ 864297T01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cp\u003eVolvo Penta used several different sensors in the same engine-control system — including separate MAP, throttle-position, camshaft-position, knock, and crankshaft-position sensors. Confirm the exact engine model, serial number, and electronic engine-control diagram before ordering. Do not substitute by appearance alone.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVolvo Penta 4.3GL-A \/ B \/ C \/ D \/ E \/ G\u003c\/li\u003e\n  \u003cli\u003eVolvo Penta 4.3GXi-B and related GXi variants\u003c\/li\u003e\n  \u003cli\u003eVolvo Penta 4.3OSi\u003c\/li\u003e\n  \u003cli\u003eVolvo Penta 5.0GXi \/ 5.0OSi (including 5.0GXi-D)\u003c\/li\u003e\n  \u003cli\u003eVolvo Penta 5.7Gi \/ 5.7GXi (including 5.7Gi-300)\u003c\/li\u003e\n  \u003cli\u003eVolvo Penta 5.7OSi \/ 5.7OSXi\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSymptoms of a Failing Crankshaft Position Sensor\u003c\/h3\u003e\n\u003cp\u003eElectronic diagnosis is recommended before replacing the sensor — several ignition and fuel-control faults can produce similar symptoms. Common indicators include:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIntermittent or complete no-start condition\u003c\/li\u003e\n  \u003cli\u003eEngine stalling without warning\u003c\/li\u003e\n  \u003cli\u003eErratic ignition timing\u003c\/li\u003e\n  \u003cli\u003eLoss of engine-speed signal at the ECM\u003c\/li\u003e\n  \u003cli\u003eIntermittent misfire under load\u003c\/li\u003e\n  \u003cli\u003eCrank-position related fault codes stored in the ECM\u003c\/li\u003e\n  \u003cli\u003ePhysical damage to the sensor body or connector\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eThe sensor installs at the timing-cover area and interfaces directly with the ECM. Before installation, inspect the electrical connector, wiring harness, sensor mounting surface, and the related O-ring (3859009), which appears adjacent to 3858979 in several Volvo Penta engine-control diagrams. Avoid contacting the sensor tip against hard surfaces during handling, and follow the Volvo Penta service procedure for the exact engine model.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this the same as a MAP sensor or camshaft position sensor?\u003c\/strong\u003e\u003cbr\u003eNo. The MAP sensor (3858987) and camshaft position sensor (3863130) are separate parts that appear in the same engine-control system. Some listings incorrectly identify 3858979 as a MAP sensor — multiple marine ignition catalogs and Volvo Penta engine-control diagrams consistently identify it as the crankshaft position sensor.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I diagnose this sensor myself?\u003c\/strong\u003e\u003cbr\u003eWith the right diagnostic scanner and Volvo Penta wiring information, crank-position sensor faults can often be isolated. However, because no-start and stalling conditions can have multiple causes, professional electronic diagnosis is recommended before replacing the sensor.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit both GL and GXi versions of the 4.3L?\u003c\/strong\u003e\u003cbr\u003eYes — confirmed applications include both 4.3GL (A through G suffix) and 4.3GXi variants. Different sensors may be used in other engine-control positions on the same engine. Confirm by full model designation and serial number.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the aftermarket cross-references (Sierra, CDI, Mallory) direct equivalents?\u003c\/strong\u003e\u003cbr\u003eThey are listed as cross-references for this application in aftermarket catalogs. Verify the cross-reference against your exact engine model and serial number before use, as aftermarket sensor specifications can vary.\u003c\/p\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003eThe most common issue with this part is being confused with the MAP sensor (3858987) or camshaft sensor (3863130) — all three are in the same Volvo Penta engine-control system and can look similar. Customers usually arrive at this sensor after a no-start or stalling diagnostic, and confirming the fault code or sensor function before ordering saves the most time. At $322, it’s worth doing proper diagnosis first rather than replacing sensors by elimination.\u003c\/p\u003e","brand":"VOL","offers":[{"title":"Default Title","offer_id":43564033245220,"sku":"3858979","price":322.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/d9cb3fa7-8caf-44e4-8752-e4f833ef3b95.png?v=1788670476","url":"https:\/\/marisolmarine.com\/products\/volvo-780","provider":"Marisol Marine Company","version":"1.0","type":"link"}