XC40 Intermittent Ignition

Wow, that sounds familiar! I had almost the exact same symptoms with my XC40. Did you check all the fuses? I mean, really double-check? Because for me, it turned out to be a silly fuse that was causing all the trouble. I was convinced it was something major, like the fuel pump or even the ECU, but nope, just a little fuse! What about the battery voltage? Is it showing any signs of weakness?

Thanks! I visually inspected the fuses in the primary fuse box, but didn't test each with a multimeter. Do you recall which specific fuse it was? Battery voltage seems normal, around 12.6 volts at rest.

Okay, 12.6V sounds solid. Honestly, I can't remember the exact fuse number - it was a while ago. It was related to the engine management system though, I'm pretty sure. I'd strongly suggest getting a proper diagnostic scan done at a trusted workshop. They'll be able to pinpoint the fault much quicker than poking around in the dark. Save yourself the headache!

Took your advice and consulted a local workshop. Turns out a fuse related to the ignition system was defective. Replacement cost, including labor, was just 52€. Your insights helped me get a quick and cheap fix. Thanks again!