Captur Diesel Underboost After Tuning

Hey, I've got a Captur diesel too, and this sounds familiar. I had a similar problem with reduced power and a fault code after some aftermarket modifications. Did the tuning involve messing with the ECU or boost pressure? What's the exact fault code you're getting? Knowing that might give us a better clue.

Thanks for the quick response! The tuning did involve remapping the ECU for more power and torque. I don't recall anything specific about boost pressure, though. The exact fault code is P0299 (Turbocharger/Supercharger Underboost Condition). Does that ring any bells?

Yep, P0299 definitely rings a bell. I had the exact same code after my little 'performance upgrade'. In my case, the tuning had messed with the turbo's parameters. I ended up taking it to a workshop to get it properly diagnosed and rectified. They reverted the ECU to the stock settings and recalibrated everything. Saved me a lot of headaches in the long run.

Appreciate the info! Seems like the best course of action is to have a workshop look at it. I visited a local mechanic and, indeed, the ECU had to be reverted to the stock settings. The repair cost me 180€. Thanks again for confirming my suspicions and sharing your experience.