X15 1659 Code

[Rawze]

fault 1659 is cylinder mis-fire detected.

=== DO an injector leak test just like the video shows and replace whatever needed to ensure it will pass.
ref: http://rawze.com/forums/showthread.php?t...3#pid75483

=== replace the guts of the fuel pump (tappets, rollers, plungers).. its due at 400k miles.

=== Do a throughout EGR tune-up on the engine and egr system.
ref: http://rawze.com/forums/showthread.php?t...8#pid78348

=== Replace the Exhaust pressure sensor and clean out the passageway thru the thermostat housing and the hose feeding it from the manifold. - Cylinder mis-fire detection is done via this sensor and passageway.

Matter of fact.. aside from changing the pump guts(due at 8,000 hrs or 400k miles) ... all this other stuffs should be done about every 2 years. Otherwise, someone is neglecting their equipment and then wondering why they have problems.