(16 Feb 2024, 9:49 am)NL62WVW wrote The engineer that came out to me yesterday told me it's a sensor fault on the emissions system.
Basically what happens is the ECU detects a fault with the emissions system and logs it, after about 100 miles the engine will go into limp mode with a maximum speed of 10 mph.
There reason they are kept on 51/51/93/94 is because ifs quicker for engineers to get to them rather than travelling to Durham/Bishop to reset them with the laptop
Given they use a Mercedes engine, I'd hazard a guess and say it's either the pressure sensor on the DPF or the pressure transducer for the EGR valve. They're common issues on Mercedes cars (and our diesel Smart car!).
In our case, when the error pops up it won't let you rev past 2.5k and you get no boost.