0445117021 vs 0445117022
How the 0445117021 (Bosch) relates to 0445117022 — Related Bosch number in the 3.0 V6 TDI family..
0445117021
Bosch · Piezo · Common Rail
Bosch CRI3 piezo common-rail injector for the Audi/VW 3.0 V6 TDI (engine codes CLAB/CPNA/CMHA) fitted to the Audi A4/A5/A6/A7/A8 and Q7, plus the VW Touareg. Audi/VW OE 059130277CD / 059130277EJ; related Bosch 0445117022. Each injector carries a 7-character IMA/ISA correction code that is written per cylinder (adaptation channels 071-076) on fitment. Failures are driven by poor fuel filtration, contamination and back-leakage wear. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Piezo stack / internal wear; Water-in-fuel corrosion; Nozzle coking.