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Hi gang, Long time lurker, seldom poster here. I've searched the forum and can't find a match to my case so I thought I would post the question to see if anyone can help. I have a 2015 A6 Avant, 200kw, 3.0 tdi with about 100k on the clock. Never missed a service and has always worked like a charm. I am not the first owner but have put the last 30k or so on it. It came to me with FSH (not all main dealer). Now a few weeks back I was on a relatively long and spirited drive back home from Oxfordshire when I noticed the engine was overheating (warning light on and torque limited). I pulled over and immediately upon slowing down the car started to cool down again. I checked the expansion tank and I wasn't low on coolant. As the car had cooled down again I thought I'd just drive a bit more judiciously for the remainder of my journey which worked just fine. A couple of weeks after that, I was driving to work at motorway speeds and noticed the car heating up, this time only by a couple of LEDs over 90c on the dial. Again, it cooled back down to 90c when I slowed down to about 50mph and cruised like that for a while. This seemed to be getting more frequent so I took it to my mechanic. As the car never overheats on idle and only overheats when driving at speed, he suggested it was the water pump as opposed to the thermostat. He changed the water pump for me but the problem still persists on journeys over about 25 minutes in duration. Even stranger, last night I went for a drive to confirm this, as I hadn't had a longer journey for a week or so, the engine heated up as described above. I then put the cabin heater on full blast and HI heat for a while and the temperature came down rapidly and stayed at 90c regardless of my speed. All very peculiar! Has anyone experienced this before or does anyone know of what could be causing this issue? I've spoken to an Audi specialist who thinks either the new water pump was faulty out of the box or the thermostat might actually be the problem, even though the symptoms aren't typical (if such a thing exists). I did speak to him before my experiment last night though, so he doesn't have those details. I'm at my wits end trying to figure this out so any help and guidance from those in the know here would be much appreciated! memzey

Hello guys I'm hoping there's a Joda on here that can help. Ive had my a4 avant 5 yrs now and it's never nmissed a beat until 6 months ago. It is a 3ltr Tdi v6 automatic. I was driving along then stopped in stationary traffic and at tickover just cut out dead, turned her over and it eventually started with a couple of pumps of pedal but I had never had to do that previously on start up. The second time this occurred I was parked facing down a hill and it would not start. So left the car and sent a recovery friend to get it at which point it started straight away. In to the garage it went and they could not find anything wrong with it and the historic codes they said were relating to injectors so I'm thinking injector replacement or Fuel backfeed somehow. They said run it till problem is constantly there. So 5 days of running it no problems it cuts out instantly whilst crawling in slow traffic again and again it will not startso we recovered it to my garage who said it's electrical it must be a relay so my electrician checked it all and said it was not electrical and it was fuel related and proved it by starting the car with easy start at which point it fired up virtually straight away. So the garage did injector leak off tests and all injectors were delivering equal amounts of fuel so the injectors have been ruled out as ok ? So then they found a fuel pressure sensor on the end of the common rail was not holding pressure so they changed it ( £300 ouch) I took it away drove it for 1/2 day and boom it cuts out again with exactly Same problem but on a busy roundabout causing mayhem luckily there was a garage very close by so I borrowed some brake cleaner and used it as easy start and she fired up straight away at which point I drove it back to the garage where it still is after a month!! And no further forward ! Any help would be greatly appreciated