Bosch 0445110616 Diesel Injector

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.

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.

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.

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.