Hi ... I have a 2006 Peugeot 407 hdi. I recently removed the air filter housing to replace the filter
and to be able to check the hoses at the back of the engine bay (trying to check for vacuum leaks) and I noticed that the housing has a small outlet/inlet pipe underneath it with a lip that looks like a hose is meant to be attached to it. I have looked online and have seen photos of a small hose attached to that outlet/inlet with the end plugged off. Any ideas if it need to be plugged or, pulled into something or left open as a breather?
Peugeot 407 1.6hdi air filter housing
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mickthemaverick
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Re: Peugeot 407 1.6hdi air filter housing
Just seen this post, better late than never! Are you referring to the 'spout' next to the number 75 in this diagram:
and if so have you got your answer by now? 
407 air filter.pdf- Copied from Servicebook Backup
- (166.41 KiB) Downloaded 18 times
I used to be indecisive, now I'm not so sure!
I used to ride on two wheels, but now I need all four!
I used to ride on two wheels, but now I need all four!