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Fueling question

I have a 07 GTi. It has a IE stage 2 set up in it. I have all supporting mods
IE air intake
IE stage 2
IE downpipe with sport cat
scorpion axle back exhaust
forge turbo muffler delete
revo front mount.
now my question is that i keep getting the p0089 code.
Ive replaced both fuel pumps
High fuel pressure regulator
low pressure fuel sensor
fuel filter 6.6 bar.
what am I missing I cant figure it out. Can someone please help?

thanks in advance,
steve
 
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