My Peugeot 406 HDI engine managment light has come on and now will not rev above 2000ish RPM. It idles fine and starts straight away though, any ideas why would be appriciated?
I have had a loose turbo hose and you can normally hear the leak/whine. It turned out after reading the codes to be the maf sensor, when I removed it you could see a resistor had broken off part of it over time so simple fix.