S212 C155E13 - The pressure relief valve for system pressure has a malfunction. There is an open circuit.

[BlueRubber]

Hi all,

Got a facelift S212 E350 2013, about 20 days ago had an inde mobile mechanic replace the rear passenger suspension airbag with an OEM unit.
Today when starting the car it came up with this fault:
C155E13 - The pressure relief valve for system pressure has a malfunction. There is an open circuit.
It also has an amber image on the dashboard showing the car with an arrow under it.

It's probably coincidental, but it happened when I started the car to plug in the scan tool.

What are the diagnosis steps to take to figure out the fix?

Thanks

 

[alexanderfoti]

The pressure relief valve is on the pump body itself. Not available seperatly from mb but maybe in the aftermarket?

Run a pnumatic test to confirm fault.

 

[BlueRubber]

The problem was due to a damaged wire near the connector of the pressure relief valve