Renault Scenic power loss after chip tuning

Sounds rough! I had a similar problem with my 2016 Opel Insignia, also diesel. Kept getting a fault code related to the fuel injection system after some 'performance enhancements.' Did you try reading the diagnostic code with a scan tool? That will help narrow it down further.

Yeah, the scan showed something related to the car's computer and the altered engine settings. Your Opel experience is interesting. Did the problem keep happening, and what did you do to fix it?

Yep, the problem kept recurring. Eventually, I gave up and took it to a reputable workshop. They confirmed my suspicions about the chip tuning causing the issue. Honestly, I'd suggest biting the bullet and taking it to a professional. Will save you a lot of headaches.

Thanks, that's really helpful. I'm going to take it to a pro. They think the engine control unit needs recalibrating, and it'll cost about 180€. Thanks for sharing your experiences.