Gardner6LYT:
I presume this Volvo is non add blue.Volvo have had major problems world wide with add blue and it is the Operators that have so far picked up the mega bills.
The V4 throw up, ad-blue bad quality reduce power in 10hrs, it’s either the two lamda sensors 1 in exhaust box, or 1 in the outlet pipe, so both get changed £650, for both, or the dosing unit is being silly, ours have all been both sensors.