Vauxhall Adam Spark Plugs: Intervals, Fitment & Warning Signs
On the Adam, two internally different versions of the genuine coil pack look identical externally — fitting the wrong one causes rapid re-failure.
Illustration for editorial purposes
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OEM Part Number: confirm via engine code — aftermarket NGK 94123 / Bosch 0 242 240 707
| Petrol engines in this generation | 1.0 116 HP; 1.2 69 HP; 1.4 87 HP; 1.4 101 HP; 1.4 S 150 HP (the list is truncated, no engine codes given) |
|---|---|
| Spark plugs (aftermarket) | NGK 94123 (iridium, M14x1.25, hex 16, 19 mm reach, 5 kOhm); NGK 91039 (iridium, M14x1.25, hex 16); NGK 91970 (iridium, M12x1.25, hex 14, 25 mm reach, taper seat); NGK 8894 (nickel, M14x1.25, hex 16); Bosch 0 242 240 707 (gap 0.7 mm, M14x1.25, hex 16); Bosch 0 242 236 571 (gap 0.7 mm); Denso IK22FTT (iridium, platinum earth, M14x1.25); Denso IK20TT (iridium, platinum earth, M14x1.25) |
| Genuine (OE) numbers quoted | Denso KJ20CR-L11 = 1214016 (nickel, M14x1.25, hex 16) |
| Fitment notes | The 1.2 and 1.4 naturally aspirated engines use the M14x1.25 16 mm hex family (NGK 94123/91039, Denso IK20TT/IK22FTT, Champion CCH9013); the M12x1.25 14 mm plugs (NGK 91970, Beru Z376) are the other family, likely for the 1.0 turbo, though this is not stated. Champion OE198/T10 is a copper centre plug |
A Genuine Fitment Trap Worth Knowing on Replacement Coil Packs — Vauxhall Adam Spark Plugs
If you're replacing a coil pack, this is genuinely worth knowing beforehand: genuine Vauxhall coil packs exist in two internally different versions that look externally identical, and fitting the wrong one for your specific car results in premature failure shortly after fitting — a pattern reported repeatedly by owners who've replaced a coil pack only to have it fail again within a very short time. Always confirm the exact, correct part reference for your specific engine and build date via your VIN rather than assuming any coil pack that physically fits the socket is the right one.
Vauxhall Adam Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
A worn set of spark plugs in the Vauxhall Adam doesn't make itself obvious: idle roughens slightly, acceleration loses a bit of urgency, and both symptoms are easy to blame on something else entirely. Given how inexpensive the part is, it often gets neglected for far longer than it should.
Vauxhall Adam Spark Plugs: Watch: Replacing It
YouTube Short (quick demo). Longer 1.2/1.4/1.6 Corsa/Astra/Adam video: Ef2jK2mnqOI.
Vauxhall Adam Spark Plugs: What They Do
Every combustion cycle in the Vauxhall Adam's petrol engine starts with a spark plug igniting the compressed fuel-air mixture, and their condition shapes efficiency, economy and smoothness directly. Diesel versions don't need them at all, relying purely on compression to ignite fuel.
Vauxhall Adam Spark Plugs: Generations, Engines & Spark Plug Count
| Diesel variants (CDTi) | Not applicable — diesel engines use compression ignition and have no spark plugs at all |
|---|---|
| 1.0 Ecotec (petrol, confirmed engine code B10XE) | Genuinely only 3 spark plugs — this three-cylinder engine is shared across Corsa E, Adam, Astra K and Viva, not a four-cylinder |
| 1.2/1.4 petrol (other standard trims) | 4 spark plugs — a conventional four-cylinder engine, genuinely different from the 3-cylinder 1.0 unit |
| VXR, older Corsa generations (1.6 turbo) | 4 spark plugs — the VXR uses a four-cylinder turbocharged engine, not the smaller 3-cylinder unit fitted to standard trims |
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Vauxhall Adam 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 Vauxhall Spark Plugs
The same part, covered across other Vauxhall models.