Parts for your 2014 Mitsubishi Asx-Ignition coils

2014 Mitsubishi ASX ignition coils — what they do and when to service

Referencing Mitsubishi technical documents and common parts catalogues, ignition coils are relevant to the 2014 Mitsubishi ASX petrol models. The 2.0‑litre 4B11 MIVEC petrol engine uses a coil‑on‑plug (COP) ignition system with one coil per cylinder (Mitsubishi Motors Workshop Manual: Group 13A – Ignition System for ASX/Outlander Sport GA models). By contrast, the 1.8 Di‑D turbo‑diesel (4N1 family) is compression‑ignition and uses glow plugs rather than ignition coils (Mitsubishi 4N1 Diesel Engine Manual). Leading ignition suppliers also list individual COP coils for the petrol variants of this vehicle. So, if the 2014 ASX is petrol, it has ignition coils, if it’s diesel, it doesn’t.

For petrol 2014 ASX owners, the ignition coils are the hardworking transformers that step the 12‑volt battery supply up to tens of thousands of volts so each spark plug fires cleanly. The coil‑on‑plug design improves spark energy, eliminates high‑tension leads, and sharpens timing—great for smooth commuting and better fuel economy. Over time, heat cycling under the bonnet and vibration can break down insulation or crack coil boots, especially around the cam cover. The tell‑tales are a rough idle, hesitation under load, worse fuel use, and a Check Engine light with misfire codes (P0300–P0304). If ignored, persistent misfires can overheat the catalytic converter and waste fuel.

Coils aren’t a routine throwaway item, but they should be checked whenever spark plugs are serviced (typically around 90,000–100,000 km for iridium plugs on 4B‑series engines per Mitsubishi service guidance). A good technician will pull each coil and look for carbon tracking, split boots, oil in the plug tubes from a rocker cover gasket leak, or water ingress after a wash or heavy rain. If one coil fails, many owners replace just the dud, however, on higher‑kilometre cars it can be smart to test and replace any weak siblings at the same visit to avoid repeat trips.

Tips for trouble‑free coils on a 2014 ASX petrol:

• Use quality OEM‑equivalent coils and iridium plugs gapped to spec.
• Keep plug tubes dry, fix cam cover leaks promptly.
• Apply a light smear of dielectric grease inside coil boots.
• Torque plugs correctly to protect threads and heat transfer.
• After coil work, clear codes and road‑test under load.

DIYers should disconnect the battery, label connectors, and avoid levering on the plastic housings. If the car is the diesel ASX, coils don’t apply—healthy glow plugs, good fuel, and a clean intake are the focus there.

Does a 2014 Mitsubishi ASX have ignition coils?
Yes for petrol models with the 2.0‑litre 4B11 MIVEC engine, which use a coil‑on‑plug unit on each cylinder. No for the 1.8 Di‑D diesel, as it’s compression‑ignition and uses glow plugs instead. A quick check: if there are spark plugs under the coils, it’s the petrol setup.

How often should ignition coils be replaced?
There’s no fixed replacement interval. Inspect coils whenever spark plugs are changed (around 90,000–100,000 km) or if there’s a misfire. Many coils last well past 150,000 km, but heat, oil leaks, or moisture can shorten their life. Replace any coil that tests weak or triggers misfire codes.

What are the symptoms of a failing coil on an ASX?
Common signs include rough idle, stumble under acceleration, harder starting, increased fuel use, and a Check Engine light with P0300–P0304 codes. Under the cover, look for cracked boots, carbon tracking, or oil in plug tubes—all clues a coil is struggling or being damaged by a seal leak.