Mercedes Cdi low power part 2

part 2 as we diagnose and repair low power condition 2008 Mercedes GL320 Cdi diesel.

Codes we had in this vehicle on previous repair
2016-001 rail pressure monitoring via volume control valve. The rail pressure is too low
2020-004 Rail pressure monitoring via volume control valve . The rail pressure is too high

Codes we had in this vehicle this time.
2679-4 check the component b76 fuel filter water level sensor faulty
2526-2 check the signal to component Y77/1 charge pressure positioner short circuit to ground
2527-2 check the component Y27/9 left EGR/ARF positioner short circuit to ground
2514-2 check the component R398/1 vent line heater element short circuit to ground
3053-4 check the component b2/7b1 intake air temp iat sensor signal fault.

The following were codes we had this time but I failed to record the code number.
check the component b2/6b1 intake air temp iat sensor signal fault.
check the component d2/7 right hot film mass air flow maf sensor short or open circuit
check the component b2/6 left hot film mass air flow maf sensor short or open circuit
check the component b2/7 left hot film mass air flow maf sensor short or open circuit
check the exhaust back pressure. Exhaust back pressure is too high

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Please do not call me for tech help. Feel free to post questions in the comments below. I try to answer every comment if I have something helpful.

[amichemourad]

Bonjour
Encore une magnifique vidéo
Bravo !

[danman]

nice diagnostic and repair, great video tks

[pyronitro]

we want more videos! we want more videos! what do we want? More videos! when do we want it? Now! i meant this with humor. 😁😁😁😁😁

[buzzix]

Hello, how are you doing sir ?
I have a VW golf R 2016 model, i keep geting misfire in cylinder #2 with hide cylinder at only high rpm between 6000 and 7000 if i hold it there, if i drive normally it doesn’t show up, if i turn off the car and turn it back on it remove the epc light and everything normal, i did everything to resolve this issue but with no luck,
I changed the spark plugs and the coils, i changed the fuel pump, i cleaned the 8 fuel injectors with a machine and tested them and they seems normal and swapped their places all plugs, coils, injectors, i checked the electrical wires to the coils, i did carbon cleaning the valves, but it keep only misfiring in cylinder 2 and if i clear the code the car goes to normal only if i hold the rpm at 6-7 it comes back on, can you help me with that please? What do you think?