1 1

BMW

Genuine BMW N55/S55 High-Pressure Fuel Injector GDI Rail Injector OEM 13647639994 - Petrol/Gasoline Direct Injector Replacement Upgrade - Fits M135i M235i 335i 435i 535i 640i 740i F80 M3 F82 M4 F87 M2C X3 X4 X5 X6 (F-Series)

Genuine BMW N55/S55 High-Pressure Fuel Injector GDI Rail Injector OEM 13647639994 - Petrol/Gasoline Direct Injector Replacement Upgrade - Fits M135i M235i 335i 435i 535i 640i 740i F80 M3 F82 M4 F87 M2C X3 X4 X5 X6 (F-Series)

£288.63
£297.00 £288.63
Sale Sold out
Shipping calculated at checkout.

Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

BMW N55 and S55 High Pressure Petrol Injector - OE Part 13647639994

Bring back crisp response, clean combustion and dependable performance with a brand-new OE direct petrol injector for BMW straight-six turbo engines. If your F-series six-cylinder is suffering from a lumpy idle, hesitation, rich running, increased fuel use or persistent fault codes, a worn injector is a common culprit. This factory-original rail injector is the correct specification for N55 and S55 powertrains and is the smart choice for maintenance, preventative care or when running software upgrades.

Why this OE injector is the right choice

  • Factory calibration for precise fuel delivery and excellent atomisation
  • Correct seat and seal for a leak-free install the first time
  • Restores drivability on turbocharged inline-six platforms, both standard and mapped
  • Helps protect catalysts and oxygen sensors by preventing over-fuelling
  • Ideal reliability refresh for Stage 1 and Stage 2 tuned cars

Real-world results

We fit these injectors regularly at MJ Modifications and have run them on our own cars. Owners consistently report smoother idle, stronger part-throttle response and a return to factory refinement once the faulty unit is replaced.

Common symptoms of a tired injector

  • Misfire when hot or under load
  • Unstable idle, stutter on take-off or flat spots
  • Fuel smell, blackened exhaust tips or noticeably worse mpg
  • ECU warnings for mixture control, trim limits or cylinder misfire
  • Extended cranking or difficult hot restarts

What you receive

1 x Original BMW high pressure direct petrol injector for N55 and S55 engines.

Installation and coding

For balanced fuelling across all cylinders, we recommend replacing injectors as a matched set where budget allows. After fitting, each unit must be coded to the ECU using its individual calibration data so the engine management can apply the correct compensation values.

Want it fitted and coded professionally? MJ Modifications in Warwickshire offers supply, installation and coding for F-series six-cylinder models. Request a quote at info@mjmodifications.co.uk.

Vehicle coverage

Suitable for a wide range of F-series BMWs equipped with the N55 or S55 petrol engine, including but not limited to:

  • 1 Series F20 and F21 - M135i including LCI and xDrive
  • 2 Series F22 - M235i and xDrive variants
  • 3 Series F30 F31 F34 - 335i including xDrive and Hybrid 3
  • 4 Series F32 F33 F36 - 435i including xDrive
  • 5 Series F10 F11 and F07 GT - 535i including xDrive and hybrid derivatives
  • 6 Series F06 Gran Coupe, F12, F13 - 640i including xDrive
  • 7 Series F01 and F02 - 740i and long wheelbase versions
  • M cars - F87 M2 Competition, F80 M3, F82 and F83 M4 including GTS and CS
  • X models - F25 X3 35i, F26 X4 35i and M40i, F15 X5 35i, F16 X6 35i

Not sure it fits your car? We offer a free compatibility check before dispatch. Add your UK registration or the last 7 digits of your VIN at checkout and we will confirm the correct part for your chassis.

Part number

BMW 13647639994

Why buy from MJ Modifications

Performance BMWs are our daily business. We supply and install these injectors week in, week out, because OE components deliver the consistency and reliability our customers demand. Buy with confidence and keep your six-cylinder running as it should.

Warranty

Manufacturer warranty available. UK customers benefit from a two-year manufacturer warranty and international customers from a one-year manufacturer warranty when a VIN is supplied at checkout and vehicle compatibility is confirmed.

Search-friendly terms

BMW petrol direct injector, OE rail injector N55, OE rail injector S55, BMW inline-six GDI injector, F-series 35i injector nozzle, M Performance injector, M2C injector upgrade, F80 M3 injector nozzle, F82 M4 injector nozzle, 335i injector unit, 435i injector unit, 535i injector unit, 640i injector unit, 740i injector unit, X3 35i injector, X4 35i injector, X5 35i injector, X6 35i injector, BMW injector 13647639994, high pressure spray valve BMW, direct injection petrol sprayer, replacement injector for tuned BMW, ECU coding required injector, Warwickshire BMW injector fitting.

View full details