Parts for your 2017 Mitsubishi Outlander-Ignition coils

2017 Mitsubishi Outlander Ignition Coils: What They Do and When to Replace

Based on Mitsubishi Motors service information for the 2017 Outlander and major ignition component catalogues from DENSO and NGK, ignition coils are fitted to the petrol-powered models (including the PHEV) using coil-on-plug systems—one coil per cylinder. The 2.4-litre four-cylinder and 3.0-litre V6 both use ignition coils. The 2.2-litre DI-D diesel, however, doesn’t use ignition coils at all because diesel engines rely on compression ignition and glow plugs rather than spark to light the fuel–air mix. So, coils are relevant for petrol and PHEV variants, but not for the diesel.

For petrol Outlanders, the ignition coil’s job is to take the 12-volt supply and step it up to thousands of volts to fire the spark plug at precisely the right moment. In the 2017 Outlander’s coil-on-plug setup, each cylinder gets its own coil, which improves spark energy and timing accuracy and trims down misfire risk. It’s a tidy, efficient system laid out right under the engine cover for straightforward access during routine servicing—exact details are covered in the 2017 Mitsubishi workshop manuals and matching parts listings from DENSO/NGK.

Coils generally aren’t a routine replacement item like filters, but they should be inspected whenever the spark plugs are changed (often around the 90,000–120,000 km mark depending on market guidance). Look for heat cracking, oil intrusion, or perished boots. Common symptoms of a failing coil include rough idle, hesitation under load, a spike in fuel use, and a check engine light with misfire codes (P0300–P030X). If one coil goes at high kilometres, some owners choose to replace the set to avoid repeat visits, though it’s fine to replace just the faulty unit if the others test well.

When fitting new coils, stick with reputable OEM-quality brands and follow the factory torque spec for the hold-down bolts. It’s smart practice to apply a small dab of silicone dielectric grease inside the coil boot to help sealing and future removal. Avoid blasting the engine bay with high-pressure water—moisture in the plug wells can cause tracking and misfires. For the Outlander PHEV, all the same coil checks apply, the high-voltage hybrid system is unrelated to the petrol ignition coils, but standard battery safety and care around wiring still matter. A quick coil health check during scheduled servicing can keep the Outlander running smooth and efficient across Aussie and Kiwi roads.

• Signs a bad coil: rough running, hard starts, poor economy, and misfire codes.
• Best practice: inspect coils at plug change, keep moisture out of plug wells, and use OEM-grade replacements.

Popular questions about 2017 Mitsubishi Outlander ignition coils

How many ignition coils does a 2017 Outlander have?
On petrol models, there’s one coil per cylinder: four on the 2.4-litre and four on the PHEV’s petrol engine, and six on the 3.0-litre V6. The 2.2 DI-D diesel has none, because it uses compression ignition and glow plugs instead of spark ignition.

Do ignition coils need replacing with the spark plugs?
Not automatically. Coils are usually replaced only when there’s a fault. However, it’s wise to inspect them when the plugs are due—around the 90,000–120,000 km window in many schedules. If one fails at high kms, some techs recommend replacing the set for peace of mind, but targeted replacement is acceptable if testing shows the others are healthy.

What are the most common symptoms of a failing ignition coil?
Owners often notice a rough idle, sluggish acceleration, increased fuel use, or the check engine light with misfire codes (P0300–P030X). Under the bonnet, a cracked boot, oil in the plug tube, or evidence of arcing are dead giveaways. Sorting a weak coil early can protect the catalytic converter and keep fuel economy on point.