Parts for your 2023 Mitsubishi Asx-Ignition coils

2023 Mitsubishi ASX Ignition Coils: What They Do and When to Replace Them

Ignition coils are absolutely relevant and fitted to the 2023 Mitsubishi ASX. Mitsubishi’s own technical specs for the 2023 ASX list a petrol MIVEC inline‑four engine, which is a spark‑ignition design. In Mitsubishi factory service information for ASX petrol engines, the ignition system is coil‑on‑plug, meaning one coil per cylinder controlled by the engine ECU. That setup eliminates high‑tension leads and delivers a reliable spark right at the plug.

On the 2023 ASX, the ignition coil’s job is to transform the 12‑volt supply into the high voltage needed to fire the spark plugs under load. The coil‑on‑plug arrangement improves cold starts, trims emissions, and helps fuel economy by delivering a consistent spark. It’s a tidy, low‑maintenance design that suits everyday commuting as well as long trips around Aotearoa and Australia.

There’s no fixed replacement interval for the coils themselves, they’re generally “fit and forget” until symptoms appear. They should, however, be inspected whenever the spark plugs are changed (often around 90,000–100,000 km for iridium plugs—follow the service schedule in the owner’s handbook). During servicing, a tech will look for cracked housings, heat discolouration, oil in the plug tubes from a cam cover leak, and any signs of arcing. Coils can be tested with a scan tool by checking misfire counts and, if needed, by swapping a suspect coil to another cylinder to see if the fault follows.

• Common signs of a failing coil: rough idle, hesitation under load, poor fuel economy, hard starts, and an engine light with misfire codes (P0300–P0304).
• Best practice: rule out worn plugs first, ensure correct plug gap and spec, and use quality OEM‑equivalent coils.
• Avoid blasting the engine bay with high‑pressure water—moisture can shorten coil life.

Replacement is straightforward for a trained tech: disconnect the battery if required by procedure, remove the engine cover, unplug the coil connector, remove the hold‑down, lift the coil, and refit in reverse with a light smear of dielectric grease on the boot if specified. Fasteners should be tightened to the manufacturer’s torque spec. After replacement, clear any stored codes and road‑test to confirm a smooth idle and clean pull through the rev range. Look after the plugs and keep the top of the engine clean and dry, and the ASX’s coils typically go the distance.

Popular questions about 2023 Mitsubishi ASX ignition coils

Does the 2023 Mitsubishi ASX have ignition coils?
Yes. It uses a coil‑on‑plug ignition system with one coil per cylinder on its petrol MIVEC engine, managed by the ECU for precise spark timing and dwell.

How long do the ignition coils last on a 2023 ASX?
Many last well past 150,000 km. There’s no set interval—replace only when diagnostics point to a faulty coil or when age‑related issues (cracks, misfires) appear. Keeping plugs fresh helps coils live longer.

Is it safe to drive with a failing ignition coil?
It’s not recommended. Driving with a misfire can damage the catalytic converter, increase fuel use, and leave the vehicle down on power. If it’s stumbling or flashing the engine light, book a check promptly.