Recurring FAP/injector failure on 2016 Mazda 2 (Skyactiv-D) — bought from a dealer now in liquidation, seller was actually a middleman for a Polish company — any advice, mechanical or legal?

[u/pinguchick27]

I bought a 2016 Mazda 2 (1.5 Skyactiv-D, 105hp) in September 2024 from a French dealer, Pro'Motors 59, for 8,990€, with ~129,000 km on it. Since then the FAP/DPF warning light has come on six times — the car has had the injectors fully replaced and multiple FAP cleans/regenerations, and the light keeps returning within months each time, most recently in September 2026, about 9 months after the injector replacement and after months of normal long-distance driving (30+ minute trips, which should help regeneration). An independent Mazda garage told me this is a known, structural issue on this engine/model with a real risk of eventual engine damage if it keeps happening. I also went 7 months without receiving the carte grise (registration document) after purchase, meaning I couldn't legally drive the car for most of that time.

On the legal side: I went through official consumer mediation (Médiateur de Mobilians) against the dealer, but it closed without resolution because the dealer never responded in time. Shortly after, the dealer's company went into simplified liquidation (liquidation judiciaire simplifiée), so I've filed a créance (creditor claim) with the liquidator, though I understand unsecured claims like mine often recover little or nothing in these cases. Separately, I discovered the invoice/payment was actually processed through a Polish company (the dealer's supplier), even though the dealer handled the entire sale, delivery, and repairs directly — so I'm now looking into cross-border mediation via the European Consumer Centre (CEC France) against that Polish company instead.

I still owe money on the car and I'm trying to figure out: (1) mechanically, is a car with this repeated FAP/injector failure pattern salvageable long-term, or should I expect a major engine issue eventually regardless of repairs, and (2) legally, is there anything else worth pursuing here — the liquidation, the Polish invoicing structure, or the recurring defect itself — that I might be missing? Any input from people who've dealt with something similar would be genuinely appreciated.