0445115079 — Technical Research
Bosch CRI3 piezo common-rail injector for the early Audi/VW 3.0 V6 TDI engine, fitted with engine codes ASB, BKN and BMK. VW/Audi OE number 059130277BD. Used across the Audi A4 (B7), A6 (C6), A8 (D3) and Q7 (4L), plus the VW Phaeton and Touareg. Common failure drivers on these 3.0 V6 TDI piezo injectors are fuel contamination, internal piezo-stack wear and high back-leakage, which the ECU compensates for until the injector falls outside its correction range. Key symptoms: Hard starting / extended cranking; Rough idle and vibration; Loss of power / limp mode; Black or grey smoke. Common failure modes: Piezo-stack wear / high back-leakage; Nozzle coking / poor atomisation; Corrosion from water in fuel.
Bosch 0445115079 3.0 V6 TDI (ASB/BKN/BMK) Common Rail Injector
Bosch CRI3 piezo common-rail injector for the early Audi/VW 3.0 V6 TDI engine, fitted with engine codes ASB, BKN and BMK. VW/Audi OE number 059130277BD. Used across the Audi A4 (B7), A6 (C6), A8 (D3) and Q7 (4L), plus the VW Phaeton and Touareg. Common failure drivers on these 3.0 V6 TDI piezo injectors are fuel contamination, internal piezo-stack wear and high back-leakage, which the ECU compensates for until the injector falls outside its correction range. Key symptoms: Hard starting / extended cranking; Rough idle and vibration; Loss of power / limp mode; Black or grey smoke. Common failure modes: Piezo-stack wear / high back-leakage; Nozzle coking / poor atomisation; Corrosion from water in fuel.
High back-leakage from a worn piezo injector drops cranking rail pressure on the 3.0 V6 TDI, making the engine slow to start, especially when cold.
An out-of-balance injector unevenly fuels its cylinder, producing a shaky idle and audible misfire on the V6.
When injector delivery falls outside its correction range the ECU pulls timing and boost or drops the engine into limp mode.
Poor atomisation from a worn piezo nozzle over-fuels the cylinder, producing visible smoke under load.
A leaking injector causes a pronounced top-end knock on the 3.0 V6 TDI, often most obvious at idle.
Internal leakage and over-fuelling waste fuel and can trigger fuelling-related fault codes.
- codingEach Bosch piezo injector carries an individual IMA/ISA correction code that must be written into the ECU after fitting (channels per cylinder); without coding the V6 runs on default trim and may log cylinder-balance faults.
- InstallationReplace the fuel filter and check for water/debris before fitting - contaminated fuel is the leading cause of repeat failure on the 3.0 V6 TDI.
- InstallationFit new seals/clamps and use the correct tightening torque; reused or over-torqued hardware causes blow-by around the injector bore.
- MisdiagnosisRead live injector correction and back-leakage values to find the weak cylinder before removal rather than replacing all six injectors blind.
- WarningConfirm the stamped OE number (059130277BD) and Bosch part number on the injector body before ordering - the 3.0 V6 TDI ran several injector revisions (e.g. the later 0445117021 CLAB/CPNA/CMHA) that are NOT interchangeable.
- TestingBench-test on a Bosch-capable piezo common-rail tester across delivery and back-leakage points; verify spray pattern and cylinder balance before refitting.
What is Bosch injector 0445115079?+
A Bosch CRI3 piezo common-rail diesel injector for the early Audi/VW 3.0 V6 TDI engine (codes ASB, BKN and BMK). VW/Audi OE number 059130277BD.
Which vehicles use 0445115079?+
Audi A4 (B7), A6 (C6), A8 (D3) and Q7 (4L) 3.0 V6 TDI, plus the VW Phaeton and VW Touareg 3.0 V6 TDI - engine codes ASB, BKN and BMK.
Is it solenoid or piezo?+
It is a Bosch piezo (CRI3) common-rail injector.
What is the VW/Audi OE number for 0445115079?+
059130277BD (some listings also show 059130277AB). Always confirm the number stamped on your original injector before ordering.
What are the symptoms of a failing 0445115079?+
Hard starting, rough idle and vibration, loss of power or limp mode, black smoke, diesel knock and higher fuel consumption.
Why does my 3.0 V6 TDI knock or rattle?+
A leaking injector causes a top-end knock on the V6 that is often most obvious at idle. Bench-test to confirm the faulty cylinder before replacing.
What causes these injectors to fail?+
Fuel contamination, water in the fuel and high-mileage piezo-stack wear that drives up back-leakage - fix the cause, not just the injector.
Do I need to code the injector to the ECU?+
Yes. Each Bosch piezo injector has an individual IMA/ISA correction code that must be written into the ECU after fitting, or the engine runs on default trim and may log cylinder-balance faults.
Is 0445115079 the same as 0445117021?+
No. 0445115079 (OE 059130277BD, codes ASB/BKN/BMK) is the earlier 3.0 V6 TDI injector; 0445117021 (OE 059130277CD/EJ, codes CLAB/CPNA/CMHA) is a later revision. They are not interchangeable - match the stamped OE number.
Should I replace one or all six?+
Diagnose each with live correction and back-leakage values; on high-mileage V6 engines failures often cluster, so check all six before deciding.
Does a remanufactured 0445115079 perform like new?+
A properly remanufactured injector is bench-tested and recalibrated to the Bosch plan to meet original delivery and back-leakage specifications.