A few questions:
- How old is the car?
- Were you experiencing any DPF or related problems BEFORE the recall for injector replacement, and did these problems lead to the injectors being identified as the problem?
- Was it a VW main dealer that did the work?
At this stage, I would write a letter to the dealer that did the injector replacement, spelling out the problems you've had since the recall work. State that the car is evidently not in a condition to be driven because of the DPF light, and that you require a courtesy car while they fix the problems that have appeared following the recall and injector fix.
If they will not do as you request, escalate to VW customer services.
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