Bosch 0445110158 Diesel Injector
4.0L TDI V8 · 0445110158
Remanufactured BOSCH 0445110158 (CRI2.1, 1600 bar) common-rail diesel injector for the Audi A8 (D3) 4.0 TDI V8 quattro (engine ASE, 2003–2005; incl. A8 L). Audi OE references 057 130 277 L / 057 130 277 M; Bosch exchange 0986435169. Note: the later 4.2 TDI V8 uses different piezo injectors (057130277AG/AK/AM) — always verify by the number etched on your old unit. Fully tested and calibrated to OEM specification with 12 months warranty.
1
Engine codes
7
OE / cross-refs
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Vehicle fitments
12mo
Warranty
Common failure symptoms
On the 4.0L TDI V8 platform, a failing Bosch 0445110158 injector typically presents as: hard starting or extended cranking; rough or uneven idle; loss of power under load; excess smoke from the exhaust; cylinder misfire or contribution fault codes.
When two or more of these appear together, suspect the injector before peripheral systems — a comparative leak-off test and live-data cylinder-balance review will isolate the failed unit without tear-down.
When two or more symptoms appear together, suspect the injector before peripherals (EGR, glow plugs, turbo). A live-data leak-off test on each cylinder is the fastest route to the failed unit.
What Causes These Injectors To Fail
The documented failure modes on this platform are: injector back-leak beyond specification; nozzle wear degrading the spray pattern; combustion gas leaks past the injector seat washer.
Internal wear cannot be repaired in situ — once delivery drifts outside calibration, remanufacture or replacement is the reliable fix.
How Workshops Diagnose 0445110158 Faults
Run a comparative leak-off (back-leak) test across all injectors before condemning a single unit. Compare requested vs actual rail pressure in live data at idle and under load. Inspect injector connectors and wiring before replacing hardware.
Never condemn a common-rail injector on a fault code alone — codes identify the circuit or cylinder, while leak-off volumes and correction values identify the component.
How Every Unit Is Tested Before Despatch
Each remanufactured 0445110158 is fully stripped, ultrasonically cleaned and inspected; worn components are replaced with OE-grade parts. The rebuilt unit is then calibrated on a common-rail test bench against the manufacturer's specification sheet — delivery, back-leak and response are all verified before the injector is sealed and despatched with its calibration data on file.
Every unit carries a 12-month parts warranty and free UK delivery.
Vehicle Coverage At A Glance
The 0445110158 trusted family covers 1 verified vehicle fitment across 1 make: Audi. Every fitment listed on this page is registry-verified — no scraped or assumed applications.
OE & Cross-References
0445110158 supersedes or cross-references 5 further OE numbers, including 057130277L, 057 130 277 L, 057130277M, 0986435169 and 0 986 435 169. Always match the reference etched on your failed unit's body — cross-references within a family are verified equivalents, but etched numbers remain the source of truth.
Related fault codes & engine guides
Engine guides
Trusted compatibility
Engine codes
OE / cross-references (5)
Vehicle fitments
| Make | Model | Engine | Years |
|---|---|---|---|
| Audi | A8 / A8 L (D3) | 4.0 TDI V8 quattro (ASE) | 2003–2005 |
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Frequently asked
Related engine guides
Other Bosch and same-platform injector families worth checking.
All cross-references in this family
Every reference below resolves to a PDP linked to this trusted family. 0445110158, 057130277L, 057 130 277 L, 057130277M, 0986435169, 0 986 435 169.
Bosch know-how from the Knowledge Centre
Identification, coding, fitting and the mistakes that cause comebacks.