01 2.0Hdi Loss of power in fourth and fifth gear - mcb999
My Peugeot 806 (diesel) has recently seemed to lack power necessary to accelerate much when in fourth or fifth gear. It's a struggle getting up to 70+ and uphill it's a no-no. There are no warning lights and the lower gears don't seem to be affected. Anyone any ideas what might be causing it?
01 2.0Hdi Loss of power in fourth and fifth gear - Screwloose

Lots of possibilities. Blocked cat; MAF sensor; fuel filter; tank pump; split boost hose/intercooler; dozer valve?
01 2.0Hdi Loss of power in fourth and fifth gear - mcb999
Cheers! None of it sounds too serious.