A Mitsubishi Galant Owner's Guide to Ignition Coils (2004-2012)
Fix your Galant's misfire by understanding its ignition coils and choosing the right replacement part.
- Your Galant uses a coil-on-plug system; a check engine light with a P030X code is the best clue to a bad coil.
- For 3.8L V6 models, the three rear coils are very difficult to access and should be replaced together to save on future labor costs.
- Premium aftermarket brands like NGK, Delphi, and Denso are highly recommended for reliability and performance similar to OEM.
- Continuing to drive with a misfire can cause unburned fuel to destroy your catalytic converter, a very expensive repair.
Is Your Galant's Engine Running Rough? It Could Be an Ignition Coil.
A failing ignition coil is a common problem that can make your Galant run poorly. When a coil starts to go bad, the spark plug for that cylinder doesn't get enough power. This leads to an incomplete engine cycle known as a misfire. You'll usually feel this as a shake or shudder, especially when the car is idling. The check engine light will almost always come on, and a code scanner will typically show a code between P0300 and P0306, pointing to the specific cylinder that is misfiring.
Choosing the Right Aftermarket Coil for Your Galant
When you shop for a new ignition coil, you'll see many brands at different prices. Not all are created equal. For a critical part like this, quality matters. Here’s how the available brands generally stack up based on owner experiences and mechanic recommendations.
- Premium Brands (OEM Quality or Better): Brands like NGK, Delphi, and Denso are often original equipment suppliers for many car manufacturers. They are known for excellent reliability and performance that meets or exceeds Mitsubishi's standards. Choosing one of these is the safest bet for a long-lasting repair.
- Standard Quality Brands: Brands such as Standard Ignition (SMP), Hella, and Walker Products offer a good balance of quality and price. They are reputable names in the aftermarket industry and provide a reliable alternative to premium brands.
- Economy Brands: Brands like DriveWire, Global Parts, and others fill the budget-friendly category. While the low price is tempting, be aware that quality can be inconsistent. An economy coil might fail sooner, putting you back where you started.
V6 Owners: Beware the Rear Coils!
If you have the 3.8L V6 engine, replacing the three ignition coils on the front of the engine (near the radiator) is simple. However, the three rear coils are located underneath the upper intake plenum. Replacing them requires removing this large engine component, making the job significantly more difficult 🎬 Watch: How to access the rear spark plugs and coils. and time-consuming. Because of the extra labor, it's highly recommended to replace all three rear coils at the same time, even if only one has failed.
How Much Should an Ignition Coil Replacement Cost?
The cost depends on your engine and whether you do it yourself. The 2.4L 4-cylinder is much cheaper to service than the 3.8L V6, 🎬 See this walkthrough for replacing coils on the 4-cylinder engine. especially if you're paying a shop to access the rear coils.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Coil (Single) | $31 - $135 |
| New OEM Coil (Single) | $100 - $155 |
| Shop Labor (4-Cylinder) | $50 - $80 |
| Shop Labor (V6, Rear Coils) | $150 - $300+ |
Pro Tip: Use Dielectric Grease
When you install a new ignition coil, apply a small amount of dielectric grease to the inside of the boot where it connects to the spark plug. This helps prevent corrosion, seals out moisture, and makes it easier to remove the coil in the future.
Frequently Asked Questions
Should I replace all ignition coils at once?
On the 2.4L engine, it's fine to replace only the single failed coil. On the 3.8L V6, if a rear coil fails, it is strongly recommended to replace all three rear coils and the spark plugs at the same time due to the high labor cost to access them. Many owners choose to replace all coils at once for peace of mind, as they tend to fail around the same age.
How do I find which coil is bad?
Use an OBD-II scanner to read the check engine light code. A code like P0301 indicates a misfire on cylinder 1, P0302 on cylinder 2, and so on. You can then swap the coil from the misfiring cylinder with a coil from a working cylinder. Clear the codes and run the engine. If the misfire code moves to the new cylinder, you've confirmed the coil is bad.
🎬 Watch: Simple diagnostic tests to find the cause of your misfire.Are the coils for the 4-cylinder and V6 engines the same?
Yes, for the 2004-2012 generation, the same ignition coil part number is often listed for both the 2.4L I4 and the 3.8L V6 engines. Always confirm fitment for your specific vehicle, but parts like UF532 or MR994643 are commonly used across both engine types.
Are there any recalls for the Galant ignition coil?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database and other sources show no specific recalls or technical service bulletins (TSBs) for ignition coil failure on the 2004-2012 Mitsubishi Galant.
Helpful Videos
Technical Specifications
OEM Part Numbers: MR994643 1832A016 MN195805 FK0278
Coil-on-Plug (COP) type, 3-pin blade connector, 12V operation.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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