BMW X1 Spark Plugs: Intervals, Fitment & Warning Signs

Confirmed: a genuine technical bulletin addresses this engine failing to restart after a cold start, caused by a specific spark plug part combined with software — since superseded twice, worth confirming you have the correct current part.

Illustration for editorial purposes

OEM Part Numbers

Accuracy note: we weren't able to verify a confident BMW X1 spark plugs part number at the time of writing. Please confirm the correct part via a BMW dealer or parts specialist using your VIN.

A Cheap Part That Causes Expensive-Feeling Problems

Worn spark plugs 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.

Before you buy: plug type and gap specification vary by engine size and generation. Always confirm against your VIN before ordering.

What They Do

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.

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

Confirmed: A Genuine Technical Bulletin Worth Knowing About — BMW X1 Spark Plugs

If the engine has turned over but failed to actually start on a repeated cold-start attempt, this is genuinely worth knowing: a confirmed technical bulletin identifies exactly this fault on this specific engine, where the car may start normally on the first attempt of the day, but then fail to start if switched off immediately and tried again shortly after. The cause was identified as unfavourable engine management software combined with the original spark plug part fitted from the start of production. Genuinely worth knowing this specific spark plug has since been superseded twice with revised versions, worth confirming your car has the correct, most current superseded plug part specifically rather than the original design if you're facing this exact cold-start symptom.

A genuinely useful diagnostic technique worth trying: swapping a suspect coil to a different cylinder is a direct way to confirm whether a misfire is genuinely coil-related — if the misfire follows the coil to its new position, this confirms the coil; if it stays on the original cylinder instead, the cause is more likely the plug itself.

It's also genuinely worth knowing that coil packs have been documented failing even on cars with genuinely low mileage, worth knowing that mileage alone isn't a reliable indicator of whether this specific component needs replacing.

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.

BMW X1 Spark Plugs: Intervals, Fitment & Warning Signs

OEM Part Numbers

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Confirmed: A Genuine Technical Bulletin Worth Knowing About — BMW X1 Spark Plugs