Parts for your 2018 Mitsubishi Asx-Ignition coils

2018 Mitsubishi ASX ignition coils: purpose, care, and replacement

Based on technical references, ignition coils are absolutely fitted to the 2018 Mitsubishi ASX petrol models. The Mitsubishi Factory Service Manual ignition section, the Mitsubishi ASA/ASA-CAPS parts catalogue for GA2W/GA3W (2018MY), and major aftermarket catalogues from Denso and NGK all list individual coil-on-plug (COP) units for the ASX’s 2.0-litre 4B11 MIVEC engine (e.g., Mitsubishi p/n 1832A016 and supersessions). Only diesel variants (not typically offered in AU/NZ for 2018) use glow plugs instead of ignition coils. So for a 2018 ASX petrol, ignition coils are relevant and required.

On this ASX, each cylinder gets its own coil mounted directly on the spark plug. The coil’s job is to step battery voltage up to the very high voltage needed to jump the plug gap and ignite the air–fuel mix. A COP setup reduces energy losses, improves timing accuracy, and helps the engine start cleanly, idle smoothly, and pull strongly through the rev range.

Ignition coils aren’t a scheduled maintenance item, but they do wear with heat and vibration. Many last well beyond 100,000 kilometres, yet they can fail earlier—especially if plugs are overdue, there’s oil in the plug tubes, or connectors are loose. During routine servicing, it’s smart to inspect the coils whenever the spark plugs are changed: check for cracking, carbon tracking, melted boots, or corrosion. Keep moisture out of the plug wells and fix any rocker cover gasket leaks promptly. Use quality, correct-spec coils and match them with fresh, correctly gapped plugs to reduce coil stress.

• Common signs of a failing coil: rough idle, hesitation under load, hard starts, increased fuel use, and a check engine light (codes like P0300–P0304 or P0351–P0354).
• If misfires appear, scan the ECU, confirm the cylinder at fault, and coil-swap to verify before replacing.

1. Under the bonnet, remove the engine cover, unplug the coil connector, and undo the hold-down bolt.
2. Lift the coil, inspect the boot and plug well, and replace as needed. A light smear of dielectric grease on the boot helps future removal.
3. Refit, tighten to factory spec, reconnect, clear codes, and road test.

A fresh set of plugs at the recommended interval, tidy wiring, and a healthy battery will keep the ASX’s ignition coils happy. When in doubt, a quick diagnostic by a trusted technician will save time and guesswork.

Popular questions about 2018 Mitsubishi ASX ignition coils

How long do ignition coils last on a 2018 Mitsubishi ASX?
Many owners see well over 100,000 kilometres from the original coils. Heat, vibration, neglected spark plugs, or oil intrusion can shorten their life. If misfires start showing up, test and replace only the faulty coil, unless age and condition suggest doing a matched set.

Can you drive with a bad ignition coil?
It might run, but it’s not a good idea. Driving with a misfire can damage the catalytic converter, waste fuel, and leave the ASX underpowered. If the check engine light is flashing or it’s running rough, sort it quickly to avoid bigger bills.

Do ignition coils need maintenance?
They’re largely maintenance-free, but inspection during spark plug changes is wise. Keep plug gaps correct, fix any oil leaks into the plug wells, and ensure connectors and earths are clean and snug to reduce coil stress.