131K miles - 6 glow plugs and a controller. Fault shown was

Fault Code: 004A2E
Fault Explanation:Glow plug cylinder 5, control

along with

Fault Code: 00459B
Fault Explanation:Smoothness regulator cylinder 5

After the glow plugs and controller replace the second fault never came back.

Cleaned out the Provent after 3K miles. No oil in the intercooler, TB or EGR valve, but a lot of carbon from the EGR. It painted the finger black when poked into the head ports. I ran a can of Liquimoly Diesel Intake cleaner to clean out the carbon and did a programmed oil change afterwards. Hopefully it cleaned out the carbon.

CCV heater error keeps coming back though.

Fault Code: 004B73
Fault Explanation:Engine ventilation heating, control

And after the glow plugs and control unit I do not want to spend $80 x 2 for the two little CCV heaters. Wonder if wiring a resistor will clear out the code since my thought is if I put in new heaters they will burn out again trying to heat the Provent flow into the turbos.