Thanks Guyz, let me give a brief history so that we are all at par. This car is actually for commercial purpose and before this problem we were doing around 600KM per day. Around January 2011, the check engine light started coming on every time we do 300KM and we had it checked, the code that time was P0402 or sometimes P0400 but this never affected the performance of the vehicle, also we changed the EGR and the performance was normal but the light still remained. Now the real issue of power started around Nov. 2011 when we had injector circuit code - all the 4 injector nozzles had leakages - we bot 2 new ones and 2 were repaired but ever since we do not have power on the engine - when we do diagnosis the only code which is there is P0402 - which was there before.
I went to some other diagnosis and noticed the values which were showing for the nozzles were different hence the reason for asking what those values mean. the new ones was showing 0.2. and the others showing 0.4 and 0.8. unfortunately people have limited knowledge on these engines so even the technician could not explain those values. any help will be appreciated on this.
the key thing is the car cannot accelerate past a certain point. when you press on the gas pedal, the engine just raves upto a certain point and does not exceed past that point despite pressing on the gas pedal all the way.