HELP needed DS3 1.6 THP Superknock

[damian1982]

Hi all desperate for help with my 2013 DS3 1.6THP (155). Car had covered 25000 when i misfire i had new spark plugs and coil packs fitted at local halfrauds this helped slightly then another misfire was detected took it to a specialist as halfrauds had no idea and it had lost compression in cylinder no.4 after they stripped down engine they found the piston had a 2cm crack in it with chunk missing so after a very expensive bill as i had to have a new oil pump timing chain and all belts hoping this was fixed the specialist didnt know what caused it in the first place as halfauds had reset eml then after about 500 miles the engine light with engine repair needed came on took it back to the specialist to run a diagnostic fault codes was :
1. P1385 Super Knock information
2. P2339 Super Knock detection
3. P0087 Fuel circuit
4. P0171 Richness regulation
5. P0172 Richness regulation
they said this might of caused the piston issue and under review it could be something to with the HPFP or PCV system any help would be appreciated as i dont want to be changing parts thats not needed anyone had similar issues ???

[Jamie@SPTuning]

Sorry I deleted your PM by mistake before I had chance to read it....
Sounds like the fuel pump is done to me.

[damian1982]

Could that of caused the piston damage also do you know of any good second hand parts as dealers want 550 for one if it a big job to replace hpfp thanks