VITO 120CDI (W639 ) limp mode & Codes

[tjamesbo]

Hi Can anyone help me I've got the following codes on a carsoft after replacing a split intercooler hose
Started with a MAF range error code and limp mode so i replaced the MAS all fine for a few weeks Then Limp mode again and inspection of an oil drip L.H.S. revealed a split in the intercooler hose -now replaced and its going into limp mode again with the following :
Current -Manifold Absolute pressure / Barometric Pressure Low
Pending Turbocharger / supercharger Underboost
Pending Manifold absolute Pressure / barometric pressure Circuit Low
Its a W639 120CDI I clear them on my carsoft OBD scanner Then after a while on a journey the engine check light comes on and back into limp mode
now looks like a trip to a specialist to see whats going on certainly getting fed up of Limp Mode also just wondering whose capable of sorting it OM642 seems fraught and not much room to do anything under the bonnet
Boyd

 

[Marku]

Can only suggest that you need access to the WIS, Workshop Information System. That is what the dealers work from and there are copies around but the official one is available through the Mercedes-Benz Club which also gives access to the EPC both are a great help. A full list of the diagnosis codes is available on the forum at
Full Diagnostic Trouble Codes List

 

[m80]

I've learnt not to trust the iCarsoft too much, on the 639 with 642 anyway.
My issues started with a MAF range fault, and I believe the original fault was a bad MAF connection, but after much testing there were other bad connections also.
I had bad coonections at the EGR and the turbo actuator.

It was also suggested that the MAF adaptations need to be reset for a new MAF, and that's a Star job.

 

[tjamesbo]

Thanks i think it definitely needs a STAR session I 'll be booking it into one of our specialist indies with star in the new year , using the old W124 as a daily and the vito for occasional longer journeys in a sort of limp mode acceptable unless your on an incline when it really drops down to about 50 ish