Originally Posted by ilmdc
Does anyone know what code 4593 relates to?
Welcome to the spiral. I had 4592 ,4593, 459B faults in cylinders 4, 2 and 5. That visit they replaced my metering valve. Later they replaced all 3 injectors and cleaned out carbon. Ultimately they replaced the DDE.
My guess is it's a smooth running fault or injector failure in that cylinder.