s212 e350cgi Fuelling problem

[mobbsy30]

Hi, I was wondering if anyone could help me. My car is a s212 E350 CGI and since I bought it, it has had an intermittent problem. In specific circumstances it will misfire and the Enigine Management light will come on. If you plug in an OBD reader it gives the code 'Fuel Rail pressure too high' I have changed the sensor and I thought it was sorted, but yesterday it did it again. I have since driven it 50 miles monitoring the fuel rail pressure on the OBD reader and it seems to hover around 200000kPa dropping to 150000kPa under acceleration and returning to 200000Kpa when you ease off. Does anyone know if these numbers are in the right ballpark?