XC70 Power Loss

I had something similar with my XC70. Check engine light came on, and the car felt sluggish. Have you scanned the fault codes yourself? What did the auto scanner show?

Yes, I used a generic scan tool, and it flagged an issue with the engine management system. Seemed pretty vague. Did your scanner point to anything specific? Was it also the result of third-party chip tuning?

Mine was a mess of codes related to fuel trim and ignition timing, all pointing back to a messed-up ECU map from a tuning company. I'd advise getting it properly diagnosed at a workshop; they'll likely confirm the dodgy tune.

Thanks for the info. Took it to a specialist, and you were spot on – the chip tuning was causing the issue. They reflashed the ECU, and it's running perfectly now. Cost me 180€, but worth it for the peace of mind.