Took my van for its Ohio e-Check yesterday. The engine has 20,000 on a
rebuilt Boston Bob. It passed with flying colors 2 years ago. This time
it failed on Nitrous Oxide emissions, they are supposed to be around
900, mine were 1,900.

I called my regular mechanic (VW specialist) and he said there was
nothing he could do, when van's start failing their emissions test
that's usually the end for them. This sounds like total bs to me and I
don't know why he doesn't seem to want to even look at the van. Called
another VW shop and they said no problem, bring it in.

Now to my question. What sort of things would cause the "NO" to be high.
I would like have some idea not because the mechanic will try bamboozle
me but because I don't like to be in the position where he could.

Thanks
Melvin
83.5 Westy