Mitsubishi ASX Spark Plugs: Intervals, Fitment & Warning Signs
On the ASX, swapping plugs between two cylinders genuinely helps isolate whether a misfire is caused by the plug or something else entirely.
Illustration for editorial purposes
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OEM Part Number: confirm via engine code — aftermarket NGK 2687 / Bosch 0 242 236 618
| Petrol engines in this generation | 1.6 MIVEC (GA1W) 116/117 HP; 1.6 LPG 117 HP; 1.8 (GA3W) 139 HP (also 4WD); 2.0 and 2.0 MIVEC (GA2W) 147-160 HP (also 4WD); 2.0 Flex 170 HP |
|---|---|
| Spark plugs (aftermarket) | NGK 2687 (iridium, M14x1.25, 16 mm hex, 19 mm reach); NGK 93759 (iridium, M14x1.25, 16 mm hex, 26.5 mm reach); NGK 1496 (laser line, LPG, M14x1.25, 60,000 km interval); Bosch 0 242 236 618 (gap 0.8 mm, M14x1.25, 16 mm hex, 19 mm reach); Denso IK16TT (iridium/platinum, M14x1.25, 19 mm reach); Denso IK20TT (iridium/platinum, M14x1.25, 19 mm reach); Champion CCH9802 (iridium, gap 1.0 mm, M14x1.25, 16 mm hex) |
| Genuine (OE) numbers quoted | Hella 8EH 188 706-071 is quoted against 98079-5615G |
| Fitment notes | Every ASX plug is M14x1.25 with a 16 mm hex (Ridex 686S0126 is the only M12 item), split between a 19 mm reach and a 26.5 mm reach, so the reach has to be matched to the engine; Gaps run 0.7-1.1 mm, with iridium and platinum types in both reaches. |
Mitsubishi ASX Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
The Mitsubishi ASX's spark plugs rarely fail dramatically; they just quietly degrade, showing up as a rougher idle or slightly blunted acceleration that gets blamed on other things. The part costs next to nothing, which paradoxically makes it one of the most commonly neglected items under the bonnet.
Mitsubishi ASX Spark Plugs: What They Do
On the Mitsubishi ASX, the compressed fuel-air mixture in each cylinder is ignited by the spark plugs, and their condition feeds directly into combustion efficiency, fuel economy and how smoothly the engine runs. Only petrol engines use them; diesels rely on compression alone.
Mitsubishi ASX Spark Plugs: Generations & Spark Plug Count
| Diesel variants, where fitted | Not applicable — diesel engines use compression ignition and have no spark plugs at all |
|---|---|
| Petrol variants (all trims) | 4 spark plugs — one per cylinder |
Mitsubishi ASX Spark Plugs: Watch: Replacing It
Facelift-era ASX.
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A Genuinely Useful, Real Diagnostic Technique Worth Trying — Mitsubishi ASX Spark Plugs
If you're chasing a single-cylinder misfire after a plug replacement, this is genuinely worth trying: swapping the plugs between two cylinders and seeing whether the misfire follows the plug to its new cylinder is a genuinely useful, classic diagnostic technique. If the misfire moves with the swapped plug, the plug itself is likely the culprit; if it stays on the original cylinder, it points toward the coil, wiring, or an injector instead.
It's also genuinely worth knowing an honest warning worth taking seriously: the relationship between Mitsubishi's electronics and aftermarket ignition components can be genuinely unpredictable, worth bearing in mind when choosing replacement coils specifically.
Mitsubishi ASX Spark Plugs: Warning Signs, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Spark Plugs Guide for symptoms of worn plugs, why matching your exact plug specification matters, and trusted brands to buy from.
More Mitsubishi Spark Plugs
The same part, covered across other Mitsubishi models.