Vauxhall Insignia Spark Plugs: Intervals, Fitment & Warning Signs
On the Insignia, 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 6509 / Bosch 0 242 236 564
| Petrol engines in this generation | 1.4 Turbo 140 HP; 1.6 116 HP; 1.6 Turbo 170 and 180 HP; 1.8 140 HP; 2.0 Turbo 220 and 250 HP; 2.0 Turbo 4x4 220 and 250 HP; 2.8 V6 Turbo 4x4 260 HP; 2.8 VXR 325 HP; 1.4 LPG 140 HP |
|---|---|
| Spark plugs (aftermarket) | NGK 6509 (iridium, M14x1.25, hex 16, 25 mm reach); NGK 1565 (iridium, M14x1.25, hex 16); NGK 91039 (iridium, M14x1.25, hex 16); NGK 91970 (iridium, M12x1.25, hex 14, 25 mm reach); Bosch 0 242 236 564 (gap 0.7 mm, M14x1.25, hex 16); Bosch 0 242 240 653 (gap 0.7 mm); Denso ITV16TT (iridium, platinum earth, M14x1.25, 25 mm reach); Denso IK22FTT (iridium, platinum earth, M14x1.25) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine plugs against your VIN / engine code |
| Fitment notes | Most plugs are M14x1.25 16 mm hex; the long-reach (25 mm) ones (NGK 6509, Denso ITV16TT, Champion CET17P, Bosch 0 242 236 675) suit engines with the longer plug well, while 19 mm-reach plugs suit others, and the M12x1.25 14 mm group (NGK 91970, Beru Z376) is the smaller-thread family |
A Genuine Fitment Trap Worth Knowing on Replacement Coil Packs — Vauxhall Insignia 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 Insignia Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
A worn set of spark plugs in the Vauxhall Insignia 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 Insignia Spark Plugs: Watch: Replacing It
Insignia A, 1.8.
Vauxhall Insignia Spark Plugs: What They Do
Every combustion cycle in the Vauxhall Insignia'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 Insignia Spark Plugs: Generations, Engines & Spark Plug Count
| Diesel variants (CDTi and similar) | Not applicable — diesel engines use compression ignition and have no spark plugs at all |
|---|---|
| Petrol four-cylinder (standard/SRi trims) | 4 spark plugs — one per cylinder |
| VXR (2.8-litre turbocharged V6) | Genuinely 6 spark plugs — the VXR uses a completely different engine family from the standard four-cylinder Insignia, not a tuned version of the same unit; confirm you actually have the V6 before ordering plugs |
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Vauxhall Insignia 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.