URGENT HELP GUYS - FAULT CODES

[ravi]

Hi Guys,
Last night I experience issues with my motor and serious juddering when driving and at idle.
I’ve just scanned the system and the following fault codes appeared:-
17956-163
Boost pressure regulation valve (N75) open circuit
P1548

16486
Mass Air flow sensor (G70) – Signal too low
P0102

Has anyone experienced these?

I replaced my MAF about a year ago and N75 6 months ago.

What do I do? How can I find out where the problem is - MAF or N75?

Help!
Cheers
rav

 

[badger5]

how about both given the fault codes you posted

reset them and what happens?

 

[ravi]

i replaced the the n75 and disconnected the maf but no change.

I reset the codes and they didnt appear again

How about the coilpacks - would a fault with the coil -packs register a fault code?

 

[badger5]

yes if severe, and would be accompanied by it sounding like a subaru chug chug chug

 

[thegoal007]

I reset the codes and they didnt appear again

Is it me, but having said the above surely you now have no problem as there is no error ?

 

[ravi]

its weird as the problem is there but still no fault code

 

[<tuffty/>]

I would check vacuum pipes under the inlet mani if you are still having issues...

If you have a registered version of VAGCOM see what block 032 says after a run (with the engine idling). These are the adaption values... both should be as close to 0% otherwise this would indicate a prob... high postive value in the first box would indicate a vacuum leak..

<tuffty/>

 

[ravi]

Thanks Tufty. I dont have VAGCOM, i'm using a Sealey fault finding tool. I will check the vacuum pipes.