Parts for your 2019 Mitsubishi Asx-Ignition leads

2019 Mitsubishi ASX ignition leads — are they even a thing?

Short answer: ignition leads aren’t used on the 2019 Mitsubishi ASX. That model runs a modern coil-on-plug (COP) ignition setup across its petrol engines (such as the 2.0L 4B11, 2.4L 4B12 and 1.6L 4A92). Each spark plug has its own ignition coil mounted directly on top, so there are no traditional high-tension ignition leads to route or replace. Diesel variants don’t use spark ignition at all, they rely on compression ignition and glow plugs. This is documented in Mitsubishi technical materials including the ASX/RVR/Outlander Sport service manuals (GA-series) and the 4B1/4A9 engine workshop manuals, which describe a direct, coil-on-plug ignition system rather than a distributor or remote-coil arrangement with leads.

Why delete the leads? With COP, the coil fires the plug right at the top of the cylinder head, so there’s no long cable for the spark to travel through. That means less energy loss, cleaner signals with less radio interference, fewer parts to degrade, better packaging, and more precise control of spark timing and diagnostics. It also improves reliability—there are no lead boots to split and no carbon tracking along old insulation.

What should owners service instead? Think plugs and coils. On the 2019 ASX, the maintenance focus is:

• Spark plugs: typically long-life iridium. Replace at the interval in the owner’s/service schedule (often around 90,000–120,000 km, depending on market spec). Avoid re-gapping iridium plugs, fit the correct heat range and part number.
• Ignition coils and boots: inspect during major services. Look for hardening or cracking of the rubber boots, water or oil in plug tubes (a sign of rocker cover seal leaks), and any green/white corrosion on electrical connectors.

Symptoms that mimic “bad leads” on older cars will instead point to coils, plugs, or wiring on a 2019 ASX: rough idle, hesitation, poor fuel economy, or misfire codes like P0300–P0304. If a single cylinder is acting up, swapping that coil to another cylinder is a handy test, if the misfire follows the coil, you’ve found the culprit. When fitting new plugs, clean the wells, use a tiny smear of dielectric grease on the inside of the coil boot, and tighten plugs to the service manual torque. Aftermarket “performance leads” won’t apply here—there’s simply no place to put them.

Technical sources referenced: Mitsubishi Motors ASX/RVR/Outlander Sport (GA-series) Service Manual – Engine Electrical: Ignition System, Mitsubishi 4B1 Series Engine Workshop Manual (4B11/4B12) – Direct Ignition System, Mitsubishi 4A9 Series Engine Manual (4A92) – Direct Ignition System. Diesel models: manufacturer service literature noting compression ignition and glow plug systems.

Popular questions

Does the 2019 Mitsubishi ASX have ignition leads?
No. It uses coil-on-plug ignition, so there are individual coils sitting directly on each spark plug and no traditional high-tension leads to replace.

What should be serviced instead of ignition leads on a 2019 ASX?
Focus on spark plugs and ignition coils. Replace long-life plugs at the specified interval and check coil boots and plug tubes for cracking, moisture or oil. Address any rocker cover leaks promptly to protect the coils.

How can someone spot a failing ignition coil on a 2019 ASX?
Watch for rough idle, hesitation, increased fuel use and check-engine lights with misfire codes (P0300–P0304). Moving a suspected coil to another cylinder is a quick way to confirm if the fault follows the coil.