S204 brake vacuum pressure sensor

[Deleted member 151559]

Does anyone know how to replace this?

It's the pressure sensor on the brake servo booster, I'm getting a code for it. I think it's the reason my stop start doesn't work.

Local mb dealer is having some difficulty getting the part... The mb system cancelled his order?!

A0075420318 is the part number

 

[Gazwould]

Common as .

 

[Deleted member 151559]

Common fault or common for them to cancel?

 

[Gazwould]

Common fault to disable stop strain , not sure if any adverse braking effects ?

 

[Deleted member 151559]

Ah, no, I think it's only for the stop start system, I.e. Cars without stop start don't have it.

I guess if vacuum drops then the engine is restarted.

 

[Gazwould]

Certainly didn't notice any adverse braking when mine went .

 

[Deleted member 151559]

Certainly didn't notice any adverse braking when mine went .

Theres no dire warnings on the dash, which I would expect if its safety related.

I only found the code scanning using an icarsoft, and it clicked about the start storp when I looked it up on the parts diagram - code b03 means start stop system.



How did you replace it then? Access is a little tight.

 

[Gazwould]

Code was



Was booked in with other warranty issues .

Didn't look like sensor was changed , but all sorted , and daft as a brush stop strain restored .

Just naturally assumed the SS stopped with lower October ambient and a not peak condition original battery .

 

[Deleted member 151559]

I have the exact same code.



Sensor is £25 so I just ordered it. Have unplugged it and replugged it to no avail.

As I say a couple of days after ordering the parts guy rang me and said mb cancelled the order for no reason, but he would look into it.

 

[grober]

https://www.online-teile.com/mercedes-ersatzteile/A0075420318_Pressure-Sensor.html?language=en
Looks as if its a push fit into a grommet. If its shorted internally that may pull the supply voltage down and register as a fault?

 

[Petrol Pete]

If it is not affecting your braking but is disabling stop/start surely that is a win win situation , no ?

 

[Gazwould]

^ the best , people would pay .

 

[Deleted member 151559]

Lol

If it is not affecting your braking but is disabling stop/start surely that is a win win situation , no ?

My ocd won't allow anything but full operation.

It could be unplugged in future....

 

[Deleted member 151559]

A0075420318 Pressure Sensor MERCEDES order spare part online
Looks as if its a push fit into a grommet. If its shorted internally that may pull the supply voltage down and register as a fault?

Thanks, I will have a go, didn't want to do any damage just yanking in it.

 

[markjay]

Yes it's a common fault. Had mine done at a garage.... £40 fitted.

It affects the Stop/Start function. Like yourself, I don't like to have bits that aren't working, even if I don't actually use them.

 

[grober]

Thanks, I will have a go, didn't want to do any damage just yanking in it.

ITS PROBABLY LIKE THIS-IF SO A THIN NOSE PLIERS CAREFULLY LEVERED BETWEEN THE VACUUM UNIT AND SENSOR SHOULD DO THE TRICK?

 

[Deleted member 151559]

Still waiting on this part from the dealers, ordered mid feb....