Renault Kangoo superfluous dropping down a gear to third gear then second gear with a massive clunk

I would get the transmission fluid level checked and dependant on fluid , changed if needed . On some of the Renaults it was a sealed box that It is checked using diagnostic equipment . Not sure if this applies or not to your vehicle .

Ok, I will give that a try, thanks

Well it certainly improved the issue after topping up the fluid. Diagnostics showed exchanger flow solenoid valve cicuit open or short to earth. Looks like further work to be done

Thanks for updating the forum