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Discussion Starter #1
So my CEL came on about a week and a half ago with a message saying "emission workshop". So I waited about 5 days and bought another diagnostic cable off ebay (my old one doesn't work anymore). So I started it up last night to go for a drive and the light didn't come on this time. I haven't pulled DTCs on it yet because my cable hasn't come in yet. The funny thing is that it did the same thing about this time last year too. Any ideas? I've never heard of a car re-setting it's readiness codes by itself, but maybe that's the case??

~D
 

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Did you recently have a change in the fuel blends available from summer to winter? Probably more at work than that, like vac leaks, etc but the blend change could be enough to throw your fuel trims off for a few tanks.
 

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Discussion Starter #3
hmm, I hadn't thought of that actually. I'll have to post up what the DTCs were whenever my cable gets in (if it stored them).
 

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Did you put gas in the car? It could be a loose gas cap or purge valve issue if you did.
 

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The OBD will turn the CEL off if it doesn't see the fault after 2 or 3 drive cycles. I had the same thing several years ago with an intermittent problem in the secondary air injection system.
 

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Sometimes the evap goes away because of a loose gas cap i believe. Happened to me a few times...but then i had a more consistent one because of an aging CAT.
 

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I have a Passat V6 with 130k miles.
After instructing the repair shop to replace the air filter,
I get this "emissions workshop" warning.
After returning the car back to the repair shop to complain,
they run a diagnostic and show digital photos of the
tube from the passenger side cam to the emissions system
broken. After taping up this broken tube (most likely accidentally
broken by the auto tech) the emissions warning went away
after about 2 or 3 driving cycles. However, the next problem
shows up which is "check engine" light. After further diagnosis
by VW dealer, they find the throttle body/air filter section
with an accordion like tube to be broken.
After taping up this section too, the "check engine" light is
no longer showing up. Ohh, the wonders of some good tape
to save some money, short term. Eventually, I will replace
those broken sections after studying how to replace in more detail.
I could probably save $300 or $400 in labor costs with some
simple fixes.
 
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