Dennis, do you mean that most VWs do, or don't have EGR?  I was under the impression that VWs generally don't have EGR (at least, the three gasoline VWs I've owned were EGR-free).
 
James Eaton
Ottawa, ON
 
> Date: Mon, 3 Mar 2014 00:16:03 -0500
> From: d23haynes57@HOTMAIL.COM
> Subject: Re: Oil pressure warnings, WAS: Mann Oil Filter and lifters
> To: vanagon@GERRY.VANAGON.COM
> 
> Again the OBDII systems test many of the systems. They know if a catalytic
> converter goes bad or even if there is a cylinder misfire. Even if the miss
> fire is due a to a bad injector, vacuum leak, or an engine problem, the
> system will know.
> While hydrocarbons from leaky vapor recovery systems are a common failure
> the NOx reduction is an extremely important part of smog control. This is
> why the dyno tests were needed as an engine has to be loaded to produce the
> NOx in order to test the reduction controls. Many cars use exhaust gas
> recirculation as a control. Most VWs including the vanagon do have EGR  so
> they must rely on the engine producing less and the 3-way catalyst taking
> care of what is produced.
> 
> Dennis
> 
> 
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> James
> Sent: Sunday, March 2, 2014 11:34 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Oil pressure warnings, WAS: Mann Oil Filter and lifters
> 
> Actually, they're trying to 'save us money' - the new test, that won't work
> if the 'idiot light' is on,  only involves using the OBDII port - no tail
> pipe sniffer at all!  It is thus  $20 cheaper than the old test (which those
> of us who have vehicles like our '91 Vanagon still have to do, as there's no
> OBDII to plug into).  I just had the 2003 Matrix in for it's test last week,
> and was filled in by our local mechanic on all the ins and outs of the new
> test.  Supposedly the leading cause for the check engine light to be on here
> is a failure of the evaporative emissions control system, and it's those
> stray hydrocarbons that they're most worried about - makes sense, carbon
> monoxide isn't nearly as serious a pollutant as the various aromatic
> hydrocarbons in gasoline are.
> 
> James
> Ottawa, ON