{"product_id":"automotive-ignition-coil","title":"4-Cylinder Ignition Coil, OE 30520-RNA-A01","description":"\u003ch2\u003e4-Cylinder Ignition Coil, OE 30520-RNA-A01\u003c\/h2\u003e\n\u003cp\u003eThis is an \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Ignition_coil\"\u003eignition coil\u003c\/a\u003e built for 4-cylinder engines, cross-referenced to OE numbers 30520-RNA-A01, 099700-101, and 099700-102. If one or more cylinders on your engine has developed a misfire, a rough idle, or a noticeable loss of power, a failing ignition coil is one of the first components worth checking, especially if the symptom is isolated to a single cylinder.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Ignition Coils Fail Cylinder by Cylinder\u003c\/h2\u003e\n\u003cp\u003eOn a 4-cylinder engine with an individual coil for each cylinder, coils don't typically fail all at once, they tend to fail one at a time as heat cycling and age gradually break down the internal windings or insulation on that specific unit. That's why a misfire that's traceable to one cylinder, rather than a general roughness across the whole engine, so often points directly back to a single bad coil rather than a broader ignition or fuel system problem.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCross-referenced to OE numbers 30520-RNA-A01, 099700-101, and 099700-102\u003c\/li\u003e\n\u003cli\u003eDurable ABS housing built to withstand engine bay heat and vibration\u003c\/li\u003e\n\u003cli\u003eDirect-fit replacement designed to restore factory ignition performance\u003c\/li\u003e\n\u003cli\u003eStraightforward single-coil design for an uncomplicated replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eType: Automotive ignition coil\u003c\/li\u003e\n\u003cli\u003eApplicable engine cylinder number: 4 cylinders\u003c\/li\u003e\n\u003cli\u003eMaterial: ABS\u003c\/li\u003e\n\u003cli\u003eModel numbers: 30520-RNA-A01, 099700-101, 099700-102\u003c\/li\u003e\n\u003cli\u003eQuantity: 1 coil\u003c\/li\u003e\n\u003cli\u003eCondition: New\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eBuilt for 4-cylinder engines using the OE numbers listed above. Because ignition coils are typically application-specific down to the engine and production year, it's essential to cross-reference the OE numbers above against your original coil or your vehicle's parts documentation before ordering, or reach out with your VIN for help confirming fitment. Comparing the exact numbers stamped or printed on your existing coil against the ones listed here is generally the most reliable way to confirm a correct match before you install anything.\u003c\/p\u003e\n\n\u003ch2\u003eSigns You Need a New Ignition Coil\u003c\/h2\u003e\n\u003cp\u003eA misfire that shows up as a check engine light, a rough or uneven idle, hesitation or a noticeable loss of power under acceleration, or reduced fuel economy are all common signs of a failing ignition coil. Because a bad coil on one cylinder often triggers a diagnostic trouble code pointing to that specific cylinder, a code reader can be a useful first step in confirming which coil needs attention.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Replacing a Failing Coil Matters\u003c\/h2\u003e\n\u003cp\u003eRunning an engine with a failing ignition coil means that cylinder isn't burning fuel completely, which wastes fuel, can foul the spark plug faster than normal, and over time can allow unburned fuel to damage the catalytic converter. Replacing a weak coil promptly, rather than continuing to drive on a misfiring cylinder, helps protect the rest of the emissions and exhaust system from that kind of secondary damage.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eInstalling this coil means disconnecting the negative battery terminal, removing the electrical connector and mounting bolt from the old coil, and withdrawing it from the spark plug well before installing the new coil in reverse order. Because a loose or corroded connector can mimic the same misfire symptoms as a failing coil, inspecting and cleaning the connector contacts during installation is worth doing while everything is already accessible. If your engine has multiple cylinders misfiring at once rather than just one, it's also worth checking your spark plugs and fuel system before assuming every coil needs replacing, since a single underlying cause can sometimes affect more than one cylinder's readings.\u003c\/p\u003e\n\n\u003ch2\u003eOrdering Information\u003c\/h2\u003e\n\u003cp\u003eThis ignition coil is in stock and ships ready to install. Our \u003ca href=\"\/pages\/shipping\"\u003eShipping Information\u003c\/a\u003e page covers current timelines, and our \u003ca href=\"\/pages\/warranty\"\u003eWarranty\u003c\/a\u003e and \u003ca href=\"\/pages\/returns\"\u003eReturns\u003c\/a\u003e pages explain what to do if anything isn't right on arrival. Not sure this matches your specific engine? Our \u003ca href=\"\/pages\/request-a-part\"\u003eRequest a Part page\u003c\/a\u003e is the fastest way to confirm before you order.\u003c\/p\u003e\n\n\u003ch2\u003eRelated Parts\u003c\/h2\u003e\n\u003cp\u003eThis ignition coil is listed in our \u003ca href=\"\/collections\/engine-parts\"\u003eEngine Parts\u003c\/a\u003e collection, along with our \u003ca href=\"\/collections\/electrical-parts\"\u003eElectrical Parts\u003c\/a\u003e collection, where you'll find other ignition and electrical components.\u003c\/p\u003e\n","brand":"EasyLife Auto Parts","offers":[{"title":"Automotive ignition coil","offer_id":49813422014692,"sku":"CJHH233369301AZ","price":33.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0740\/0502\/0900\/files\/2ac47272-500a-4c7c-afca-727131d83097.jpg?v=1788786090","url":"https:\/\/easylifeautoparts.com\/products\/automotive-ignition-coil","provider":"Easy Life Auto Parts","version":"1.0","type":"link"}