S80 engine wont start

Hey, I had something similar happen with my Volvo S80. Check the battery connections thoroughly. A loose connection can cause all sorts of weird issues, like your engine control malfunction. It's like trying to power a house with a frayed wire.

Thanks for the tip! When you say 'similar', do you mean the engine wouldn't start at all? Or was it just rough starting?

Yeah, mine wouldn't start at all. Turned out to be a corroded ground cable. I'd still suggest getting a proper engine diagnostics check at a workshop. Could be an ECU issue, but start with the simple stuff first. It's like checking the fuse box before tearing apart the whole electrical system.

Thanks, I appreciate the help. I took it to the shop and you were spot on - corroded connection! Cost me 155€ to fix. Cheers!