Engine coil replacement typically runs between $150 and $500 per coil, including parts and labor, though the total bill depends on how many coils your vehicle has, which ones have failed, and your car's make and model.

Most vehicles have one coil per cylinder — a four-cylinder engine has four coils, a six-cylinder has six. If only one coil has failed, you pay for one. If multiple coils are failing at once (which happens more often than you'd expect), the cost multiplies. A mechanic's diagnostic fee, usually $75 to $150, tells you which coils are actually bad before you commit to the repair.

The price difference between a cheap coil and an expensive one is real but often smaller than you think. Aftermarket coils run $30 to $80 each; OEM (original equipment manufacturer) coils run $50 to $150 each. Labor is where the variation shows up most. A coil that sits on top of the engine takes 15 minutes to replace. A coil buried under the intake manifold can take two hours. Independent shops typically charge $75 to $150 per hour; dealerships charge $100 to $200 per hour.

Key Takeaways

  • A single coil replacement costs $150 to $500 total, but the price depends on whether you replace one coil or several, and how straightforward it is to reach on your engine.
  • Aftermarket coils cost less upfront than OEM coils, but OEM coils sometimes last longer — the difference in total cost over time is smaller than the sticker price suggests.
  • A diagnostic test ($75 to $150) identifies which coils are actually failing before you pay for replacement, and often catches related problems like bad spark plugs.
  • Labor time varies wildly: some coils take 15 minutes to swap, others take two hours depending on engine layout and what has to come apart first.
  • Replacing all coils at once costs more upfront but can save money later if the others are wearing out at the same rate.

What determines the price of a single coil

The part itself is the smallest piece of the bill. An aftermarket coil costs $30 to $80; an OEM coil costs $50 to $150. The difference matters less than it sounds because coils fail for reasons beyond the part's quality — heat, vibration, and electrical stress affect all of them. An OEM coil may last 80,000 miles; an aftermarket coil may last 60,000. Over the life of the car, you might replace the aftermarket coil twice and the OEM coil once, which can make the OEM choice cheaper in the end.

Labor is where the real variation lives. A shop charges $75 to $200 per hour depending on whether it's independent or a dealership. The time to replace a coil ranges from 15 minutes to two hours. On a four-cylinder engine where coils sit on top of the engine, you unbolt one coil, unplug the connector, and bolt on the new one — 15 minutes, maybe $25 to $50 in labor. On a six-cylinder where coils are under the intake manifold, the shop has to remove the manifold, unbolt the coils, replace them, and reassemble — two hours, maybe $150 to $400 in labor.

Your vehicle's age and design matter more than the brand. Newer cars often have coils that are easier to reach. Older cars, especially those with V6 engines, often bury coils where they're hard to access. A 2005 Honda Civic coil replacement might cost $200 total. A 2005 Ford Taurus with the same number of coils might cost $400 because the layout requires more disassembly.

When one coil fails versus multiple coils

A single coil failing is usually bad luck — that one coil got too hot, or moisture got into the connector, or the internal winding broke. You replace it, and the others keep working. This is the $150 to $500 scenario.

Multiple coils failing at the same time suggests a root cause: a coolant leak heating the engine bay, a chronic misfire putting stress on all coils, or straightforward age. If your car is 10 years old and two coils fail in the same month, the others are probably next. Some mechanics recommend replacing all coils at once in this situation. The upfront cost is higher — $600 to $2,000 for a six-cylinder engine — but you avoid a second repair bill six months later. Others recommend replacing only the failed ones and watching the others. This is a conversation to have with your mechanic, not a decision you can make from a parts list.

A diagnostic test identifies which coils are actually bad before you commit. This costs $75 to $150 and is worth doing, especially if the shop suspects multiple failures. The test also catches related problems — a bad spark plug can make a coil look like it's failing when it's actually working overtime.

Aftermarket versus OEM coils

OEM coils are made by the manufacturer or a supplier the manufacturer chose. Aftermarket coils are made by third-party companies like Bosch, Denso, or ACDelco. The OEM coil is may provide to fit and work; the aftermarket coil is cheaper but carries more risk of fit issues or early failure.

In practice, the difference is smaller than the price gap suggests. A quality aftermarket coil from a known brand (Bosch, Denso, Motorcraft) usually lasts 50,000 to 70,000 miles. An OEM coil usually lasts 70,000 to 100,000 miles. If you drive 12,000 miles a year, the OEM coil saves you one replacement over the car's life. The OEM coil costs $50 to $100 more per coil; if you replace two coils over the car's life, the OEM choice costs $100 to $200 more total. That's real money, but not dramatic.

Some shops warranty aftermarket coils for one year or 12,000 miles; others don't. Ask before you buy. A warranty doesn't cover labor if the coil fails again, but it covers the part, which is the bigger expense.

Labor costs at different shop types

Independent repair shops typically charge $75 to $150 per hour. Dealerships charge $100 to $200 per hour. Chain shops like Firestone or Midas fall in the middle, around $100 to $150 per hour. These are ranges; your local market may be higher or lower.

The hourly rate is only half the equation. A dealership might charge $150 per hour but finish the job in one hour because the technician knows that specific engine inside out. An independent shop might charge $100 per hour but take 1.5 hours because the technician has to look up the procedure. The total bill could be the same, or the dealership could be cheaper.

Dealerships use OEM parts by default; independent shops usually offer both OEM and aftermarket. If you want to control the part choice, an independent shop gives you more say. If you want the fastest, most predictable repair, a dealership that specializes in your brand is often worth the higher hourly rate.

Signs you need a coil replacement

A failing coil usually produces a misfire — the engine runs rough, hesitates under acceleration, or shakes at idle. You'll see a check engine light, and the diagnostic code will point to a specific cylinder (P0300 for random misfire, P0301 for cylinder 1, P0302 for cylinder 2, and so on). A bad spark plug can cause the same symptoms, which is why a diagnostic test matters.

Some coils fail completely and suddenly; others degrade over weeks. If the misfire is intermittent — the car runs fine one day and rough the next — the coil is probably on its way out. If the misfire is constant, it could be the coil, but it could also be a fuel injector, a compression problem, or a spark plug.

A mechanic can test a coil's resistance with a multimeter to confirm it's bad, but most shops just swap it and see if the misfire goes away. This is faster and often cheaper than testing, especially if the coil is straightforward to reach. If the misfire persists after the coil swap, the shop can test the new coil to confirm it's good and move on to other causes.

How to reduce the total cost

Get a diagnostic test before authorizing any work. This costs $75 to $150 and tells you exactly which coils are bad. Without it, you might replace a coil that's fine and miss the real problem.

Ask the shop whether replacing all coils at once makes sense for your car's age and mileage. If the others are likely to fail soon, the labor savings from doing them all together can offset the higher parts cost.

Compare quotes from at least two shops. The price difference between a dealership and an independent shop can be $200 to $400 for the same job. Call ahead and describe your car and the symptoms; most shops can give you a ballpark estimate over the phone.

If the coil is straightforward to reach on your engine, ask whether you can supply your own part. Some shops allow this and charge only for labor; others require you to buy from them. This can save $20 to $50 per coil if you find a good aftermarket part online.

Frequently Asked Questions

How long does a coil replacement take?

Between 15 minutes and two hours, depending on the engine layout. Coils on top of the engine take 15 to 30 minutes. Coils under the intake manifold or buried in the engine bay take 1 to 2 hours because the shop has to remove other parts first. Ask your mechanic for a time estimate before you drop the car off.

Can I drive with a bad coil?

Yes, but not well. A bad coil causes a misfire, which makes the engine run rough and wastes fuel. Driving with a misfire can damage the catalytic converter over time, which is an expensive repair. Get it fixed within a week or two if you can.

Will replacing the coil fix the check engine light?

Usually, yes — if the coil was the problem. After the replacement, the shop will clear the code and drive the car to confirm the misfire is gone. If the light comes back, the problem is something else, and the shop should diagnose further at no extra charge.

Is it worth replacing all coils even if only one is bad?

It depends on the car's age and mileage. If the car is over 100,000 miles and the other coils are original, replacing all of them saves labor and prevents repeat failures. If the car is newer or the other coils are already replaced, replacing only the bad one makes sense. Ask your mechanic whether the others show signs of wear.

What's the difference between a coil pack and a coil-on-plug?

A coil pack is a single unit with multiple coils inside, mounted away from the engine. A coil-on-plug sits directly on each spark plug. Coil-on-plug designs are more common on newer cars and usually cost less to replace because labor is faster. The diagnostic and repair process is the same either way.