0445110478 is the Bosch CRI common-rail injector fitted across the pre-B47 BMW 2.0-litre and 3.0-litre diesel run — covering N47D20A/B/C/D and N57D30A/B/C engines from 2007 to 2014, including the well-known timing-chain-rear-failure run on E81/E87/E90/E91/E92/E60/X3 E83 vehicles. The N47/N57 platform is one of the highest-volume diesel injector replacement jobs in the UK aftermarket because the engine ran for over a decade across the entire BMW range. The procedure below is what we apply to every returned 0445110478 core.
How a Failing N47 / N57 Injector Presents
On the N47 / N57, a failing 0445110478 injector typically presents first as a single-cylinder ticking knock at warm idle — louder than the same fault on the later B47 because the N47 ran a slightly lower rail pressure and the failed unit's mistimed shot is more audible against the background combustion. The second is a long-crank cold-start episode that lasts ten to fifteen seconds — the rail loses prime overnight while a worn injector seat bleeds fuel into one cylinder. The third is a measurable loss of fuel economy combined with shrinking DPF regen intervals — typical of late-stage nozzle wear.
Because the N47/N57 platform also has the well-known timing-chain rear-end failure mode, workshops sometimes misattribute injector knock to imminent chain failure. The two faults sound alike to an untrained ear. Run the leak-off test first — a single injector returning visibly more than its siblings is the unit to replace, and the chain stretch is a separate (and serious) job.
Vehicles and Engine Codes Using the 0445110478
Engine code coverage spans N47D20A, N47D20B, N47D20C, N47D20D (the 2.0-litre four-cylinder builds) and N57D30A, N57D30B, N57D30C (the 3.0-litre six-cylinder builds). UK fitment includes BMW 1-Series E81/E82/E87/E88 118d/120d/123d; 3-Series E90/E91/E92/E93 318d/320d/325d/330d/335d; 5-Series E60/E61/F10/F11 520d/525d/530d/535d; X1 E84 18d/20d/23d; X3 E83/F25 18d/20d/30d/35d; X5 E70 30d/35d/40d; X6 E71 30d/40d; and selected Mini Cooper D / Cooper SD R56/R55 fitments using the BMW-supplied N47.
0445110478 supersedes earlier production codes 0445110470 and 0445110471 for the same N47/N57 platform. Bore profile and connector keying are identical across the supersession — calibration map updates accommodated the Euro 5 / Euro 6 transition.
ECU Coding the BMW N47 / N57 Injector
On the N47/N57 platform, the seven-character correction string is etched onto the injector body but the BMW write-back is done through the DDE — DME pairing rather than against the DDE alone, which is unusual for diesel diagnostics. ISTA / ISTA-D for E-platform vehicles, ISTA+ for F-platform vehicles. The DME has to recognise the new injector and accept its correction value before driveaway; on a stubborn DDE the workshop sometimes needs to clear the adaptation tables and re-cycle the ignition before the new value commits cleanly.
If the diagnostic tool reports the write-back as successful but the cylinder-balance fault returns within 200 miles, the most likely cause is that the value was written but not committed — the DME accepted the input but the underlying adaptation map had not been cleared. Always clear adaptations after a successful write-back on N47/N57 specifically; this step is not needed on the later B47.
How 0445110478 N47 / N57 Injectors Are Remanufactured
BMW N47 / N57 cores route through a dedicated bench-cassette because the seven-character flow-correction code Bosch stamps on these units uses an alphabetic alphabet (rather than the alphanumeric mix used on the later B47 0445110613). The workshop step that catches most failures is the in-cassette electrical signature test: a worn N47 solenoid retains capacitance for fewer microseconds than spec on the closing edge of the second pre-injection. That deviation is invisible on a flow-only test but shows up cleanly on the electrical trace.
Each rebuilt unit is then signature-stamped, the bench trace is filed under the order, and the unit ships with the seven-character code printed on the dispatch label. The 3.0-litre N57 supply is matched on a per-bank basis when a customer orders all six for a 535d or X5 35d — bank A and bank B receive injectors with matched flow tolerance to keep the rail-pressure dynamics balanced.
0445110478 BMW N47/N57 Injector — Frequently Asked
Will 0445110478 fit my BMW 320d / 520d / X3 / X5?
Yes — provided your BMW is fitted with the pre-B47 N47 (2.0-litre four-cylinder) or pre-B57 N57 (3.0-litre six-cylinder) engine. Confirm the engine code on the V5C reads N47D20 or N57D30. The later B47 / B57 engines use a different injector primary — see 0445110613 for the B47 family.
Do I need to recode after fitting?
Yes — non-optional on N47/N57. The seven-character flow-correction code on the new unit must be written into the DDE / DME via ISTA / ISTA-D or ISTA+, indexed against the cylinder it is fitted to. Skipping coding triggers an immediate cylinder-balance fault and limp-mode within fifty miles.
How do I know if my engine is N47 or B47?
Read the engine code on the V5C. N47 reads N47D20A/B/C/D and is the 2007-2014 production. B47 reads B47D20A/B/C and is the 2014-onwards production. The two engines look similar externally but use different injector primaries — N47 uses 0445110478, B47 uses 0445110613.
Should I replace all six on a 535d / X5 35d?
On a 3.0-litre N57, when one injector has failed past 100,000 miles, expect another to follow within twelve months. Most workshops bench-test all six when one is condemned and replace as a matched set on a high-mileage car — the labour to do them sequentially exceeds the parts cost of doing them together.
No injector coding is required for the Bosch unit on most applications — follow the manufacturer fitting procedure.
Replacement Advice
Always renew the copper washers / seals and bleed the fuel system before first start. Replace only the injectors your diagnosis confirms and torque fasteners to the manufacturer's published values.
Professional Installation
We recommend installation by a suitably equipped diesel specialist using calibrated test equipment to verify the fuel system after fitting.
If your vehicle shows these symptoms, replacing the diesel injector may restore engine performance. A leak-off test can confirm the diagnosis.
Testing & Warranty
All remanufactured injectors are tested using OEM-grade diagnostic equipment to ensure fuel pressure and spray pattern meet manufacturer specifications.
OEM Test Bench Calibration
Flow-tested on Bosch EPS 200 series bench to verify fuel delivery rates at all operating pressures.
Leak-Off Testing
Each injector is tested for return flow to ensure no excess fuel is wasted back to the tank.
Solenoid Calibration
Electrical response time verified to ensure precise injection timing and quantity.
12-Month Warranty
Full replacement or refund covering manufacturing defects under normal use. No quibble.
IMA code includedProfessional injector coding may be required after installationUK-based support teamNo core exchange required
0445110470 Price Statistics
Average Price
£120.00
inc. VAT
Price Range
£120–£120
inc. VAT
Stock
2/2
In Stock
Prices based on 2 listings for the 0445110470 injector. All prices include VAT.
Compatible Vehicles for 0445110470
0445110470 is OE-fit on the vehicles below. Always confirm the engine code on your V5C and the OE marking on the failed unit before ordering — sister part numbers in this family can look identical but carry a different calibration map.
