P1652 Error code??
 

Hi guys...car is running pretty rough at present...it's a 2001 onwards,2.5CRD Voyager.
getting the above error code and it has developed a rough idle which extends through the first stages of acceleration, this is accompanied with a knocking as the engine comes under pressure, it vibrates the whole car with low revs in gear or out. There seems to be no loss of power though and it starts no problem????

Any advice guys...