btaylor0

I replaced both front speed sensors which has had no effect on the issue. @Melnic your comment sounds like a possibility. I wonder if my mechanic will have the skill to run the correct diagnostics on it.... Rear sensors could be an issue, but most likely not. An ABS pump with 360Km on it might be more suspect. I have no understanding how this system operates though so not willing to start troubleshooting

Thanks. Will add wheels off and full check to the list

I'm going to plug the car in as soon as I get a chance and see if there are any errors to read. Is it possible that there are wheel speed sensor faults being logged in the background without dash lights? Or if there was a faulty sensor(s), is the car just reacting to the incorrect information it's being given, and there is no reason for a fault to be logged? I must also check DPF soot levels as at my mileage it's high on the list of suspects. 30km test spin in the wet at the weekend, 100km cruise and 9 occurances of this issue all spaced evenly throughout the spin. I turned ACS off via the head unit at the halfway point and it made no difference. Wife was driving in the dry yesterday without any issue. Wet ->problem -> 'probably' speed sensor

Definitely adding to the list, thanks @BlueWagon Any idea if a VCDS scan should show errors with the wheel speed sensors or module? Yes yes, will plug it in this evening anyway

I'm having the same issue. 2014 1.6Tdi Octavia with 360,000 km on the clock. Well maintained car and driving very well, but, it does exactly this when wet. No other symptoms, just an apparent loss of power. Dropping a gear or sticking the foot in to try and drive through it doesn't work. The car can go from 100 to 85kph or 120kph to 105kph quickly until it recovers. My thoughts are: Is it a boost issue, is the turbo or actuator misbehaving and boost is dropping momentarily. Is the DPF crammed and needing cleaning/replacement - I must plug it in to see measureed and calculated soot levels. I seems to regen alot (fans and heat from underneath) so I'm thinking it's this, and there's a back pressure created that's choking the engine... 1 & 2 would happen all the time though, not just in the wet.... Is the wet affecting a wiring connection somewhere, but what could be in a position where water would get at it and cause a problem...? Could it be an ABS problem, somehow linked to the hill hold function, that's engaging the hill hold? (maybe I could code out hill hold for a while and see if it makes a difference) Any thoughts from the wise folk on here are much appreciated. B