Hi Well I'm having fun with my OM642 as well. After changing endless bits in the last year for various fault codes that have cleared up those issues (such as exhaust back pressure sensor, lambda sensor, Air mass sensor, etc) I am currently left with: 2047 Rail Pressure monitoring via volume control valve The rail pressure is too low. The car is a CLS320CDi with Brabus D6. The indie is always suggesting with every fault that removing the Brabus kit will sort it or is the first step to diagnosis! I have changed the fuel filter but to no avail. The car has done 85k miles and drives fine with normal acceleration except when accelerating hard where it jerks and does not accelerate. If I take my foot off, its back to normal, if I keep my foot in, the engine light comes on with the above code. Any suggestions?