on February 18, 2012, 7:11 pm, in reply to "Citroen Dispatch-Loud Diesel knock on cold start"
"Naughtodata" suggests that "P0170" relates to "Fuel Trim"
Paul that is because that IS the correct code description, no matter where you look.
The fact that P1608 is undefined on multiscan shows multiscan is not as good as it could be.
A code read with Lexia will sort the codes out.
What is the engine code ?
Kev.