0445117021 — Frequently Asked Questions
Verified answers about the Bosch 0445117021 3.0 V6 TDI (CLAB/CPNA/CMHA) Common Rail Piezo Injector (Audi A6/A7/A8/Q7, VW Touareg).
What is Bosch injector 0445117021?
A Bosch CRI3 piezo common-rail diesel injector for the Audi/VW 3.0 V6 TDI engine. Audi/VW OE 059130277CD / 059130277EJ.
Which vehicles use 0445117021?
Audi A4/A5/A6/A7/A8 and Q7, plus the VW Touareg, with the 3.0 V6 TDI (CLAB/CPNA/CMHA) engine.
Is it solenoid or piezo?
It is a Bosch piezo (CRI3) common-rail injector.
Does 0445117021 need coding?
Yes - write the 7-character IMA/ISA correction code per cylinder (adaptation channels 071-076) with VAG ODIS/VCDS.
What are the OE part numbers?
Audi/VW 059130277CD and 059130277EJ reference Bosch 0445117021; the related number is 0445117022.
How is 0445117021 different from 0445117022?
0445117022 is a related Bosch number in the same 3.0 V6 TDI family; always match the OE number and IMA code requirement for the exact variant.
What are the symptoms of failure?
Rough idle, vibration, hard starting, black smoke, power loss/limp mode and an EML.
Why does my 3.0 TDI run rough?
A worn or leaking injector unbalances fuelling; read live back-leakage data and bench-test the weak cylinder.
What causes these injectors to fail?
Poor fuel filtration, contamination and back-leakage wear - fix the cause first.
Does a remanufactured 0445117021 perform like new?
A properly remanufactured injector is bench-tested and recalibrated to the Bosch plan, then IMA-coded on fitment.