Mercedes Cdi diesel low power

Follow along as we diagnose low power condition. Two fixes in one video on 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.

[danman]

so i imagine you leave the supected shorted unplug and plug back all the connector that was disconnected to see if there is a big current draw .thanks great video

[fweeshboy]

Phenomenal diagnostic process. Enjoyed the video and gave it a like.

[eliprice]

Hello sir. I’m working on 2002 Jetta tdi. Wastegate Atuator won’t hold Vac at all. Bench service/test. Appreciate any help. Your Videos are great. Thank you for sharing your skill set. E

[SalemAbuOmar]

i have the same problem
it accord in day not in the early morning
its hard to start
mechanic assumes its fuel pressure regulator
he say to wait coz no errors code yet in the scanner
any recommendation
vw touran
2014
i.6 tdi

[briansmith]

Which is worst to work on vw or Mercedes?