4-Cylinder Ignition Coil, OE 30520-RNA-A01

4-Cylinder Ignition Coil, OE 30520-RNA-A01

This is an ignition coil 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.

Why Ignition Coils Fail Cylinder by Cylinder

On 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.

Key Features

• Cross-referenced to OE numbers 30520-RNA-A01, 099700-101, and 099700-102
• Durable ABS housing built to withstand engine bay heat and vibration
• Direct-fit replacement designed to restore factory ignition performance
• Straightforward single-coil design for an uncomplicated replacement

Specifications

• Type: Automotive ignition coil
• Applicable engine cylinder number: 4 cylinders
• Material: ABS
• Model numbers: 30520-RNA-A01, 099700-101, 099700-102
• Quantity: 1 coil
• Condition: New

Compatibility

Built 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.

Signs You Need a New Ignition Coil

A 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.

Why Replacing a Failing Coil Matters

Running 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.

Installation Notes

Installing 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.

Ordering Information

This ignition coil is in stock and ships ready to install. Our Shipping Information page covers current timelines, and our Warranty and Returns pages explain what to do if anything isn't right on arrival. Not sure this matches your specific engine? Our Request a Part page is the fastest way to confirm before you order.

Related Parts

This ignition coil is listed in our Engine Parts collection, along with our Electrical Parts collection, where you'll find other ignition and electrical components.