2026-10-08 · 5 min read
Mitsubishi Xpander Spark Plugs Malaysia — 4A91
4A91 1.5L: NGK ILKAR7L11 iridium or BKR5E copper, 4 plugs. Copper plugs every 40,000 km; iridium every 60,000 km. Port injection engine — plugs don't foul as quickly as direct injection. Access is straightforward from the top of the engine bay. Misfires from worn plugs: rough idle, hesitation on acceleration, P030X codes. Iridium upgrade recommended for longer intervals.
Xpander Spark Plugs
- 4A91 1.5L petrol: iridium spark plugs — replace every 100,000 km
- Worn plugs cause rough idle, harder starting, increased fuel consumption
- Do not extend beyond 100,000 km — misfires stress CVT and engine mounts
- Replace all 4 plugs at once — never just 1 or 2