For the last two months I've been loving every moment of my E92 M3, but sadly a month ago my daily driver (a Citroen C2 Code) packed up, and I've been driving the M3 to work and such while the C2 is in the garage. On Saturday, when the sun was out, I decided to go for a... gentle drive... Obviously let it hit temperature and settle in before pinning it (I'm not a savage), and things were wonderful. Theeeen they weren't. On the way back home, the engine warning light came on, and the car went into limp home mode. The fault read "Engine fault: reduced power". Gah. Now previously the car had a fault with the actuators, but these were repaired by Rebuild.org, so shouldn't be causing issues (plus they usually throw up other warnings too). Additionally, after turning the engine off for about half an hour, things seemed fine. No more fault light. However, I then noticed on Sunday (and this morning) that starting from cold, the engine makes a very pronounced rattling. I recorded the sounds on my phone (see below), and they seemed to disperse when the car warmed up. However, just now, I drove into town to pick up my sunglasses from Citroen (left them in the door sill like a mug), and I noticed that under acceleration, the engine was "rattling" like in the videos. I suppose I would liken it to the sound of a Spitfire, if the Spitfire were only 12 inches long. Video 1: Discovered after startup so only caught the tail end of the noise. Video 2: Starting up from cold, rattle more pronounced. Additionally, the car has sometimes thrown up errors like "rear brake light failure" and "daytime light failure" or something similar, but upon inspection all of my light are working fine. Likely just the car becoming senile? Has anyone had any similar experiences? Advice on what could be causing it? And does anyone have any recommendations for reliable garages in the Wiltshire area? It's got an aftermarket warranty but apparently they can be a tad useless and get their independent engineers to claim it's wear and tear, no matter what the issue is... Update: 17/04/2018 Sooooo things got a lot worse today. I did my walkaround as promised: And as I was driving to BMW to ask how much they were going to rip me off (£118/hr labour!), the car went into limp home mode again, and this time it was accompanied by the entire car shaking violently. I pulled over (improperly used a bus lane to get off the road so now I've got to write an email to the Council asking for forgiveness) and filmed it but it's not clear on the video at all. Sod's law then dictated that when I rocked up to BMW to get a service bloke in to look at it, the car wasn't misbehaving. Engine warning light is still on but no error messages this time, and no reduced power. Drove home fine but with the warning on. PLUS the sodding daytime running lights have broken too. I swear I'm cursed.