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Weird idle P0101 and p0172 fault codes

11K views 13 replies 3 participants last post by  sand scorcher  
#1 ·
My wife’s car has always had a weird idle had a maf sensor fault when we brought it changed it for a genuine one and ok

Recently had the breather pipe break which is common on this engine

Getting P0101 and p0172 fault code replaced the maf again but light back on checked the coolant temp with vag seems to work ok temp moves steadily

Runs fine when driving but idles all over the place and sometimes at 600rpm

Noticed this part below took all the pipes off and it doesn’t seem to do anything what does it actually do
 

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Discussion starter · #10 ·
Thanks all I have a cheap vag com system using vcds lite

I have cleaned the throttle body because of all the coolant pipes and access I couldn’t get it fully out but spent an hour cleaning it

I didn’t do the reset in vagcom as it said I need a registered product (will sort one out ) so did the full throttle a few times

It definitely seems to have helped it’s not perfect but much better then before

The secondary air system does work as tested it when cold

On my cheap code reader I had maf faults saying performance and system too rich

On vagcom it says maf signal not plausable

Will see how it goes and report back