I just replaced the right valve cover on my 2016 RR SPORT TD6, and now it is showing me P0088—Fuel rail system pressure too high. The car doesn't have power over 2500 rpm and starts to work roughly. It starts and drives smoothly at low rpm. I replaced the return fuel line as well. I cleaned the fuel rail sensor. Any idea what I should check or what may go wrong during the installation?

Thank you in advance

Ps: if it drives below 3000 rpm doesn't show check engine light on, more then that shows restriction performance. I already checked for any air leak with smoke test. It's ok

This forum is for "Full Fat" Range Rover you need

https://www.rrsport.co.uk/forum/index.php

for the Sport... Pete
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I have to post it in another forum?