BMW X3 Spark Plugs: Intervals, Fitment & Warning Signs
On the X3, related engines have genuinely had a confirmed bulletin addressing a fault where the engine fails to restart after a cold start.
Illustration for editorial purposes
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OEM Part Number: confirm via engine code — aftermarket NGK 94201 / Bosch 0 242 145 555
| Petrol engines in this generation | sDrive20i 184 HP and 1.6 170 HP; sDrive30i 251 HP; xDrive20i 184 HP; xDrive30i 249 and 252 HP; xDrive M40i 354, 360 and 387 HP; X3 M 480 HP and M Competition 510 HP; mild hybrid 20i, 30i and M40i; xDrive30e plug-in hybrid 272 and 292 HP |
|---|---|
| Spark plugs (aftermarket) | NGK 94201 (iridium, 14 mm, M12x1.25, 26.5 mm); NGK 95248 (iridium, M12x1.25, 28.5 mm); NGK 97506 (iridium, M12x1.25, 27.5 mm); NGK 4294 (iridium, 16 mm, M14x1.25); NGK 3199 (platinum, 16 mm, M14x1.25); Bosch 0 242 145 555 (gap 0.8 mm, M12x1.25); Champion OE245 (iridium, gap 0.8 mm); Champion OE259 (iridium, gap 0.74 mm) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine plugs against your VIN / engine code |
| Fitment notes | Most of the list is 14 mm M12x1.25 iridium, with a few 16 mm M14x1.25 plugs (NGK 4294 and 3199, Beru UPT12P, Denso IK20TT) that probably belong to the smaller engines; no engine codes are given. NGK 1496 is an LPG/CNG laser plug. |
BMW X3 Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
Worn spark plugs on the BMW X3 rarely announce themselves clearly — a slightly rougher idle, a bit less punch off the line — symptoms easy to blame on almost anything else in the engine bay. The part itself costs very little, which makes it an easy one to overlook for far longer than it should be.
BMW X3 Spark Plugs: What They Do
The BMW X3's spark plugs ignite the compressed fuel-air mixture inside each cylinder, and their condition directly affects combustion efficiency, fuel economy and smooth running. Petrol engines rely entirely on them; diesel engines don't use spark plugs at all, relying on compression instead.
BMW X3 Spark Plugs: Generations, Engines & Spark Plug Count
| Diesel variants | Not applicable — diesel engines use compression ignition and have no spark plugs at all |
|---|---|
| Petrol four-cylinder (most trims) | 4 spark plugs — one per cylinder |
| Petrol six-cylinder (M-Performance trims, where fitted) | 6 spark plugs — a genuinely different engine family (BMW's inline-six) from the standard four-cylinder units, not a bored-out version of the same engine |
BMW X3 Spark Plugs: Watch: Replacing It
G01 X3 B48
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A Genuinely Useful Piece of Context Worth Knowing About Misfires — BMW X3 Spark Plugs
If the engine has turned over but failed to actually start on a repeated cold-start attempt, this is genuinely worth knowing: related BMW engines have had a confirmed technical bulletin addressing exactly this fault, caused by unfavourable software combined with the original spark plug part, since superseded twice with revised versions.
It's also genuinely worth knowing that coil packs have been documented failing even on cars with genuinely low mileage.
BMW X3 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 BMW Spark Plugs
The same part, covered across other BMW models.