Car PartsIgnition Coil

Aftermarket & OEM Ignition Coil

How do you know when your ignition coil needs to be replaced?

Are you experiencing a noticeable lack of power when trying to accelerate...almost as if one of your cylinders isn't firing, or if all were just clunking along? Getting lower than average gas mileage? Is your engine stalling for seemingly no reason? There could obviously be many reasons for this condition: fuel delivery, ignition, timing, etc. That means there are lots of tests you must perform to see what exactly is causing this problem. If you have a fuel problem, then you'll likely smell it. Timing issues can usually be solved by checking the TDC marks on the crank and camshaft pulleys. Ignition problems, however, require voltage and resistance tests to pin down. You have to test your spark plug wires your ignition coil(s). Since tens of thousands of volts are required to make a spark, the resistances that you are going to measure in the cables and the ignition coil are also in the thousands of ohms. Always check your vehicle's factory service manual for proper specifications, but if you find your ignition coil is to blame for your misfires then you'll have to replace it ASAP.

What do ignition coils do in your engine?

New Ignition CoilsMechanically timed ignition has been around almost as long as automobiles have been, though advancements in technology have certainly changed how components of the system work together to provide an accurately timed spark. Central to all mechanically timed ignition systems is the distributor; however it wouldn't be able to do its job without receiving thousands of volts from the ignition coil. Your spark plugs require somewhere around 50,000 volts delivered at precisely timed intervals. Since your battery is only a 12-volt power source, the ignition coil has to step up the voltage and release it to the distributor as needed. This process happens several million times for each year the vehicle is in operation. So whether you have a central ignition coil powering a distributor or you have an ignition coil on each spark plug, it will eventually fail.

D.I.Y. steps for both styles.

Replacing an ignition coil is usually pretty easy. It involves your car's electrical system, so certain safety precautions must be followed. Always unplug your battery first. The rest of the steps will be different depending on the type of ignition system you have.

Mechanically timed ignition - Single ignition coil
  • In this type of system, your ignition coil has two poles on top of the cap (connecting to the ignition switch on one side and the contact breaker and capacitor on the other) and one central terminal that leads to the distributor.
  • Disconnect and unplug all wires, and remove the coil from its housing.
  • Clean off all the contacts, and reconnect the new ignition coil. At this time, you may want to install new spark plugs.
  • Finally, reconnect the battery and you're done.

Electronically timed ignition - Coil on each plug
  • In this type of system, you will have a coil on each plug or every other plug that are pulsed by a computer (sometimes called an ignition control module) and connected by a wire harness or high tension leads.
  • Disconnect the wire harness (or spark plug wires if you have them), and unscrew the coil from the cylinder head.
  • You can take this opportunity to change the spark plugs and/or wires if you desire.
  • Reconnect the new ignition coil, then the battery. You are done.


Only trust the best parts when fixing your engine.

Buying new ignition coils can sometimes be a confusing task. There are many brands out there, and not all are good quality. At Car Parts Discount, we offer the best brands from high quality reproduction manufacturers and the original equipment. For the budget conscious, we have less expensive replacements as well. So if you find yourself stranded and need a new ignition coil, take advantage of our low prices and fast shipping. Order online today and save.

One of Our Most Requested Parts

Ignition Coil, OEM: 25182496
Replacement Ignition Coil 25182496
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OEM: 25182496, Item: 561925

10 or More In Stock, Usually ships within 1 business day
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Ignition Coil, OEM: UC12
SMP Ignition Coil UC12
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OEM: UC12, Item: 319490

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Ignition Coil, OEM: UC12X
SMP Ignition Coil UC12X
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OEM: UC12X, Item: 319491

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Ignition Coil, OEM: FD508
SMP Ignition Coil FD508
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OEM: FD508, Item: 315681

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Ignition Coil, OEM: FD503
SMP Ignition Coil FD503
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OEM: FD503, Item: 315678

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Ignition Coil, OEM: UF522
SMP Ignition Coil UF522
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OEM: UF522, Item: 319667

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Ignition Coil, OEM: UF495
SMP Ignition Coil UF495
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OEM: UF495, Item: 319655

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Ignition Coil, OEM: UF504
SMP Ignition Coil UF504
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OEM: UF504, Item: 319662

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Ignition Coil, OEM: UF413
SMP Ignition Coil UF413
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OEM: UF413, Item: 319633

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Ignition Coil, OEM: UF434
SMP Ignition Coil UF434
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OEM: UF434, Item: 319644

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Ignition Coil, OEM: UF503
SMP Ignition Coil UF503
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OEM: UF503, Item: 319661

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Ignition Coil, OEM: UF575
SMP Ignition Coil UF575
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OEM: UF575, Item: 319677

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Ignition Coil, Round, OEM: UF262
SMP Ignition Coil, Round UF262
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OEM: UF262, Item: 319554

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Ignition Coil, Square, OEM: UF271
SMP Ignition Coil, Square UF271
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OEM: UF271, Item: 319562

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Ignition Coil, OEM: UF403
SMP Ignition Coil UF403
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OEM: UF403, Item: 319626

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Ignition Coil, OEM: UF411
SMP Ignition Coil UF411
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OEM: UF411, Item: 319631

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Ignition Coil, OEM: DR49
SMP Ignition Coil DR49
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OEM: DR49, Item: 314966

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Ignition Coil, OEM: UF592
SMP Ignition Coil UF592
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OEM: UF592, Item: 346674

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Ignition Coil, OEM: FD476
SMP Ignition Coil FD476
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OEM: FD476, Item: 315667

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Ignition Coil, OEM: UF375
SMP Ignition Coil UF375
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OEM: UF375, Item: 319616

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Ignition Coil, OEM: UF414
SMP Ignition Coil UF414
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OEM: UF414, Item: 319634

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Ignition Coil, OEM: UF526
SMP Ignition Coil UF526
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OEM: UF526, Item: 319668

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Ignition Coil, OEM: UF277
SMP Ignition Coil UF277
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OEM: UF277, Item: 319566

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Ignition Coil, OEM: UF278
SMP Ignition Coil UF278
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OEM: UF278, Item: 319567

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Ignition Coil, OEM: FD-471/FD471
SMP Ignition Coil FD-471
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OEM: FD-471, Item: 1092026

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Ignition Coil, OEM: UF540
SMP Ignition Coil UF540
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OEM: UF540, Item: 339287

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Ignition Coil, OEM: UF97
SMP Ignition Coil UF97
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OEM: UF97, Item: 319693

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Ignition Coil, OEM: FD505
SMP Ignition Coil FD505
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OEM: FD505, Item: 315679

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Ignition Coil, OEM: FD-478/FD478
SMP Ignition Coil FD-478
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OEM: FD-478, Item: 1092030

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Ignition Coil, OEM: UF491
SMP Ignition Coil UF491
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OEM: UF491, Item: 319653

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Ignition Coil, OEM: UF198
SMP Ignition Coil UF198
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OEM: UF198, Item: 319528

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Ignition Coil, OEM: UF509
SMP Ignition Coil UF509
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OEM: UF509, Item: 353667

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Ignition Coil, OEM: DR-39/DR39
SMP Ignition Coil DR-39
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OEM: DR-39, Item: 1088239

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Ignition Coil, OEM: UF279
SMP Ignition Coil UF279
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OEM: UF279, Item: 319568

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Ignition Coil, OEM: UF404
SMP Ignition Coil UF404
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OEM: UF404, Item: 319627

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Ignition Coil, OEM: UF351
SMP Ignition Coil UF351
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OEM: UF351, Item: 319603

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Ignition Coil, OEM: UF192
SMP Ignition Coil UF192
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OEM: UF192, Item: 319524

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Ignition Coil, OEM: FD509
SMP Ignition Coil FD509
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OEM: FD509, Item: 315682

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Ignition Coil, OEM: UF499
SMP Ignition Coil UF499
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OEM: UF499, Item: 319657

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Ignition Coil, OEM: UF549
SMP Ignition Coil UF549
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OEM: UF549, Item: 339288

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Ignition Coil, OEM: DR-37/DR37
SMP Ignition Coil DR-37
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OEM: DR-37, Item: 1088238

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Ignition Coil, OEM: DR-31/DR31
SMP Ignition Coil DR-31
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OEM: DR-31, Item: 1088233

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Ignition Coil, OEM: FD497
SMP Ignition Coil FD497
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OEM: FD497, Item: 315674

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Ignition Coil, OEM: UF356
SMP Ignition Coil UF356
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OEM: UF356, Item: 319607

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Ignition Coil, OEM: UF300
SMP Ignition Coil UF300
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OEM: UF300, Item: 512297

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Ignition Coil, OEM: UF274
SMP Ignition Coil UF274
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OEM: UF274, Item: 319564

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Ignition Coil, OEM: UF364
SMP Ignition Coil UF364
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OEM: UF364, Item: 319612

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Ignition Coil, OEM: UF591
SMP Ignition Coil UF591
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OEM: UF591, Item: 419743

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Ignition Coil, OEM: UF33
SMP Ignition Coil UF33
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OEM: UF33, Item: 319589

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Ignition Coil, OEM: UF38
SMP Ignition Coil UF38
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OEM: UF38, Item: 319619

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Ignition Coil, OEM: UF308
SMP Ignition Coil UF308
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OEM: UF308, Item: 319582

9 In Stock, Usually ships within 1 business day
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Ignition Cassette Wiring Harness, OEM: F50001
SMP Ignition Cassette Wiring Harness F50001
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OEM: F50001, Item: 1328990

10 or More In Stock, Usually ships within 1 business day
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Ignition Coil, OEM: UF118
SMP Ignition Coil UF118
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OEM: UF118, Item: 319499

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Ignition Coil, OEM: UF699
SMP Ignition Coil UF699
149.85, Save 39%   NEW ITEM

OEM: UF699, Item: 1298642

1 In Stock, Usually ships within 1 business day
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Ignition Coil, OEM: DR44
SMP Ignition Coil DR44
77.45, Save 39%   NO STOCK

OEM: DR44, Item: 344373

Restock date not known

Motorcraft Ignition Coil DG508
48.85, Save 39%   NEW ITEM

OEM: DG508, Item: 1036505

10 or More In Stock, Usually ships within 1 business day
Expedited delivery as soon as: Tue Aug 22
Motorcraft Ignition Coil DG521
57.85, Save 39%   NEW ITEM

OEM: DG521, Item: 1036512

10 or More In Stock, Usually ships within 1 business day
Expedited delivery as soon as: Tue Aug 22