Need help with fuel related Codes

[Matej09]

Hello, i have w212 om651 2009 sedan, but sometimes when its cold the rpm fluctuates by 50/100 up in idle other than that it runs good acceleretes good with kickdown.But after i replaced the quantity control valve on hp fuel pump Engine light has come on dash after reving it to 2k rpm and power is reduced its still fast but not as before and no kickdown.
Can the new valve be faulty cause the old one never had error codes? I never had codes before.
Should i return the old one cause the car was fast but sometimes it reved by 50 rpm when at idle?
P025285
P008800
P008700

Took it to dealer for codes here are they below.

 

[LostKiwi]

Why do you keep starting new threads with the same question on them?
If you aren't getting replies it's because folk don't know.

 

[mioba]

Next time pay the dealer to tell you whats wrong and fix it.

Seems you are getting a code list and have no clue.

Thats just an expensive waste of time

 

[Matej09]

Why do you keep starting new threads with the same question on them?
If you aren't getting replies it's because folk don't

Next time pay the dealer to tell you whats wrong and fix it.

Seems you are getting a code list and have no clue.

Thats just an expensive waste of time

Well this list is from the dealer, they say it could be injectors,rail sensors, faulty new quantity control valve which i put. I had no codes until i put the new qc valve on hp pump.

 

[mioba]

why did you put a new valve in.

 

[Matej09]

why did you put a new valve in.

Cause the rpm would go up and down during cold weather, everything else is tested and no one sees an issue.I bought the qcv given the issues like other people online had so i put the old one in and there is no check engine light for now, has kickdown like before so the new valve was defective.

Everyone else that had issues like i have replaced the qcv on hp pump and it fixed the issue but i was soo lucky that i got the shitty one.