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#1: Evaporative Emission System Question

Posted on 2006-07-17 20:23:50 by Brian Running

Check engine light came on the other day, code P0442 -- slight
evaporative control system leak. 2001 Jetta GLS with 2.0L engine.

My question for you experts is -- is there a particular part or
condition that typically causes this? In other words, is this one of
those well-known things, like coolant-temp sensors, that you can zero in
on right away?

Your expert advice is, as always, appreciated.

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#2: Re: Evaporative Emission System Question

Posted on 2006-07-18 03:54:26 by One out of many daves

AFAIK
gas cap maybe? ;-)

or you might need a vag-com tool (ross-tech.com) to help diagnose what's
wrong. It might be a bunch of different components that could cause that
DTC.
hoses, charcoal cannister, pump or valve or ???

Bentley repair manual can help too.

good luck,
--
later,
dave
(One out of many daves)

&quot;Brian Running&quot; &lt;<a href="mailto:brunning&#64;XXameritechXX.net" target="_blank">brunning&#64;XXameritechXX.net</a>&gt; wrote in message
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&gt; Check engine light came on the other day, code P0442 -- slight evaporative
&gt; control system leak. 2001 Jetta GLS with 2.0L engine.
&gt;
&gt; My question for you experts is -- is there a particular part or condition
&gt; that typically causes this? In other words, is this one of those
&gt; well-known things, like coolant-temp sensors, that you can zero in on
&gt; right away?
&gt;
&gt; Your expert advice is, as always, appreciated.

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#3: Re: Evaporative Emission System Question

Posted on 2006-07-18 07:19:37 by noway

&quot;One out of many Daves&quot; &lt;<a href="mailto:vwdoc2001&#64;ameritech.net" target="_blank">vwdoc2001&#64;ameritech.net</a>&gt; wrote in message
news:mbXug.131891$<a href="mailto:dW3.106315&#64;newssvr21.news.prodigy.com..." target="_blank">dW3.106315&#64;newssvr21.news.prodigy.com...</a>
&gt; AFAIK
&gt; gas cap maybe? ;-)
&gt;
&gt; or you might need a vag-com tool (ross-tech.com) to help diagnose what's
&gt; wrong. It might be a bunch of different components that could cause that
&gt; DTC.
&gt; hoses, charcoal cannister, pump or valve or ???

yeah the gas cap is the easiest thing but replacing that is pure guesswork
really. Might not be it and that'd be ~$30 or so down the drain if it's not
it.

that code basically means the system detected a leak at or near your fuel
tank. Doesn't mean fuel (liquid) is leaking out but rather than there are
vapors leaking out because it depresurrizes on its own. could be gas cap,
could be something else.

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#4: Re: Evaporative Emission System Question

Posted on 2006-07-18 18:47:50 by Joseph Meehan

Matt B. wrote:
&gt; &quot;One out of many Daves&quot; &lt;<a href="mailto:vwdoc2001&#64;ameritech.net" target="_blank">vwdoc2001&#64;ameritech.net</a>&gt; wrote in message
&gt; news:mbXug.131891$<a href="mailto:dW3.106315&#64;newssvr21.news.prodigy.com..." target="_blank">dW3.106315&#64;newssvr21.news.prodigy.com...</a>
&gt;&gt; AFAIK
&gt;&gt; gas cap maybe? ;-)
&gt;&gt;
&gt;&gt; or you might need a vag-com tool (ross-tech.com) to help diagnose
&gt;&gt; what's wrong. It might be a bunch of different components that
&gt;&gt; could cause that DTC.
&gt;&gt; hoses, charcoal cannister, pump or valve or ???
&gt;
&gt; yeah the gas cap is the easiest thing but replacing that is pure
&gt; guesswork really. Might not be it and that'd be ~$30 or so down the
&gt; drain if it's not it.
&gt;
&gt; that code basically means the system detected a leak at or near your
&gt; fuel tank. Doesn't mean fuel (liquid) is leaking out but rather than
&gt; there are vapors leaking out because it depresurrizes on its own. could be
&gt; gas cap, could be something else.

Of course if the gas cap has not been put on tight, that would be a good
thing to change and see what happens. Turn it until it clicks, and NEVER
top off the tank.

--
Joseph Meehan

Dia duit

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#5: Re: Evaporative Emission System Question

Posted on 2006-07-19 06:13:17 by noway

&quot;Joseph Meehan&quot; &lt;<a href="mailto:sligojoe_Spamno&#64;hotmail.com" target="_blank">sligojoe_Spamno&#64;hotmail.com</a>&gt; wrote in message
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&gt;Of course if the gas cap has not been put on tight, that would be a good
&gt;thing to change and see what happens. Turn it until it clicks

Yep. Might take a few driving cycles at various speeds to reset the light
though if it was the cause (don't necessarily expect it to go away
immediately).

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#6: Re: Evaporative Emission System Question

Posted on 2006-07-19 16:07:42 by Brian Running

&gt; gas cap maybe? ;-)

Not the gas cap. Apparently, this is not one of those common things,
with a well-known cause. Thanks!

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#7: Re: Evaporative Emission System Question

Posted on 2006-07-21 05:18:44 by One out of many daves

OK how do you know that it is not your gas cap? Did you make sure that it
was not damaged, tight and clear the faults?

<a href="http://www.obd-codes.com/trouble_codes/generic/p0442-evaporative-emission-control-system-leak-detected-small.php" target="_blank"> http://www.obd-codes.com/trouble_codes/generic/p0442-evapora tive-emission-control-system-leak-detected-small.php</a>

Well it is time to test/check the Evap system. Need to make sure that all
the valves/pump/hoses are functioning and leakfree.
It helps if you have a tool so you can do an Output test and test
components.

Have fun and let us know what you find!
later,
dave
(One out of many daves)

&quot;Brian Running&quot; &lt;<a href="mailto:brunning&#64;XXameritechXX.net" target="_blank">brunning&#64;XXameritechXX.net</a>&gt; wrote in message
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&gt;&gt; gas cap maybe? ;-)
&gt;
&gt; Not the gas cap. Apparently, this is not one of those common things, with
&gt; a well-known cause. Thanks!

Report this message

#8: Re: Evaporative Emission System Question

Posted on 2006-07-21 20:09:16 by Brian Running

&gt; OK how do you know that it is not your gas cap? Did you make sure that it
&gt; was not damaged, tight and clear the faults?

Yes, checked it out, re-set codes. Plus, due to my driving off at the
pump one day with the old cap hanging on the filler door, the cap is
relatively new (doh!) -- it is an OEM cap, bought at the dealer.

&gt; Well it is time to test/check the Evap system.

It sho nuff is. I'll start with the ol' sniff test.

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#9: Re: Evaporative Emission System Question

Posted on 2006-07-22 16:35:41 by One out of many daves

Well I guess that rules out the cap. lol

I usually apply some very low pressure air to the hoses and listen for
leaks. That cannister is usually a little hard to get to on some VWs.
Did you do the Output test yet?

good luck and let us know what you find.
--
later,
dave
(One out of many daves)

&quot;Brian Running&quot; &lt;<a href="mailto:brunning&#64;XXameritechXX.net" target="_blank">brunning&#64;XXameritechXX.net</a>&gt; wrote in message
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&gt;&gt; OK how do you know that it is not your gas cap? Did you make sure that
&gt;&gt; it was not damaged, tight and clear the faults?
&gt;
&gt; Yes, checked it out, re-set codes. Plus, due to my driving off at the
&gt; pump one day with the old cap hanging on the filler door, the cap is
&gt; relatively new (doh!) -- it is an OEM cap, bought at the dealer.
&gt;
&gt;&gt; Well it is time to test/check the Evap system.
&gt;
&gt; It sho nuff is. I'll start with the ol' sniff test.

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