BMW Genuine OE/OEM Spark Plug Ignition Plug 12120039634 (12 12 0 039 634) - For Turbo Petrol N55, S55, S63 - M2 & M2 Competition, M3, M4, M5, M6, X4 M40iX - Direct-Fit Replacement, Original BMW Part

BMW OE Ignition Plug – Part No. 12120039634

Also referenced as: 12 12 0 039 634

Restore crisp throttle response, smooth idle and dependable combustion with this factory-original BMW ignition plug. As an OE direct-fit replacement, it is the correct heat rating for standard and tuned engines, delivering reliable spark under load and helping to eliminate hesitation, cold-start stumble and intermittent misfires. This is the genuine BMW part you want when servicing high performance six and eight cylinder petrol models.

We run these on our own cars and customer vehicles at MJ Modifications. Feedback is consistently excellent, with owners reporting quieter starts, cleaner revs through the range and a noticeable return to factory freshness after swapping out tired plugs.

Compatible applications

• Models fitted with the N55 engine
• M models fitted with the S55 engine including M2 Competition, M3 and M4
• Models fitted with the S63 engine including M5 and M6
• F26 X4 M40iX 2014 to 2018

If you are searching for a BMW M2 Competition ignition plug, M3 or M4 replacement plug, or a service plug for M5, M6 or X4 M40iX, this OE component is the correct direct-fit part when equipped with N55, S55 or S63 powertrains.

Why choose this OE component

• Original equipment quality and precise fit
• Addresses misfire under load, rough running and poor fuel economy
• Correct heat range for performance driving and daily use
• Ideal preventative maintenance item for turbocharged BMW petrol engines
• Backed by BMW manufacturer warranty

Service guidance

• Replace the full set together to maintain consistent combustion across all cylinders
• Inspect coil packs and plug boots during replacement
• Recommended at scheduled service intervals or at the first sign of ignition fault

What is included

1 x BMW OE ignition plug – Part Number 12120039634

Image for illustration only. Actual item may vary slightly.

Professional fitting and support

Installation by a qualified technician is recommended. For fitting, speak to MJ Modifications in Warwickshire and request a quote at info@mjmodifications.co.uk.

Fitment confirmation before dispatch

We will verify compatibility prior to shipping. Please provide your UK registration number or the last 7 digits of your VIN at checkout so we can confirm this OE ignition plug 12120039634 suits your vehicle.

Manufacturer and warranty

Manufacturer: BMW

Warranty: Two years manufacturer warranty for UK customers and one year for international customers when a VIN is provided at checkout on compatible vehicles.

Search-friendly terms: BMW OE ignition plug UK, BMW performance plug set, N55 ignition replacement, S55 plug change UK, S63 ignition service, M2 Competition plug, M3 plug UK, M4 plug UK, M5 plug UK, M6 plug UK, X4 M40iX plug, BMW dealer plug, BMW original part 12120039634, 12 12 0 039 634, BMW petrol turbo spark plug, BMW service item ignition, BMW misfire fix plug.