2016 Smart Fortwo Pure, silver and black, tinkering new mods now.
I installed a CPA piggy back tuner and it ran terribly, as if the turbo wasn't boosting at all and the transmission was hanging gears like crazy even at part throttle. I removed it and it runs great again. My problem now is that my trouble light is on. Will it clear itself or will I need to clear it? I have to drive it every day so I can't leave the battery unplugged for days.