Hi all and help please.... Im narrowing down a fault on my FL2 to the Fuel Rail pressure sensor (or ECU) - the one in the car is the 0281002804 - However, those that want to sell one to me, after putting my VIN in, suggest its the 0281002919 I need.

I think I tried a 2919 a while back and the system ran even worse.

Has anyone encountered similar issues?
Does the sensor and regulator need replaced in pairs (ie the reason the 2919 didn't work was because i had the 0281002803 regulator?
Does upgrading from a 2804 to a 2919 require any ECU coding?