sandorck

17887 brake boost vacuum system problem
Hello I'm using vagcom and I got that code 17887 brake boost vacuum system
P1479-008 mechanical failure

I ordered a new pump and still getting the code. My car has a high idle RPM 1000 in Drive position and to move forward it jerk with acceleration to 1500RPM.

I performed a output test and the pump run fine.

I performed a vacuum boost leak test with air pressure and smoke and nothing coming out.

lyleswk

If the pump is working, the only other thing to look for is leaks. You are going to have to keep looking.

sandorck

Thanks, Anything I can do with VAGCOM to find leaks? If I unplug the MAF sensor how the car will react? so far the MAF or the throttle body or the O2 sensor I haven't replaced those. I did a throttle adaptation with VAGCOM.

I notice the in VAGCOM group 008 the vacuum Pump show as Off.
but when I do the output test it turn on and suck air. any suggestions?

pyramiid

I have the same problem on my car - A4 (B6) 2,0 96kW atm

But the other code is different:
17887 - Brake Boost Vacuum System (P1479-008 - Mechanical Failure)
17545 - Fuel Trim. Bank 1 (Add) (P1137-002 - System too Rich - MIL ON)

First code is permanent (after I delete it, comes back again) and the other shows up after some time of driving.
I took the car to repair shop and they said that pump itself is faulty. So I ordered new one (not very cheap though) and the problem was gone for a month or so. Now it came back yesterday and exact same codes appeared.

Any suggestions anyone where to look further and how?
Please help if you have any info!