2013 CKRA p0088 after cp3 install

[Hornblende1]

Hey everyone,

I bought another CR TDI with a blown-up fuel system, this time being a CKRA.
I got a CP3 pump for it, as I don't like putting cp4s in these cars if I want to keep the car. After I put it in, I have been getting p0088 code w/limp mode at low loads, usually while cruising or letting off the pedal after acceleration. I put a new metering valve in it, part # 0928400643, as I thought the one on the pump could be causing the issue. No change. I also replaced the fuel rail with a "good" used fuel rail from eBay when I did the conversion. That being said, it could've been a bad sensor/contaminated rail. I'm starting to wonder if the pressure valve on the rail is causing the issue.


Any insight would be appreciated, whether it be diagnostic instruction or anecdotal info.

Thanks

 

[Hornblende1]

Replaced the rail regulator, no difference. Put about 1000 miles on the car since i cp3 swapped it.

Only happens when I'm at very low load, ie at 45 mph w cruise on, for example. Its usually when specified is around 900 bar, the car will read 1100-1200 bar and go into limp mode.