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PREVIOUS 00DTS,04DTS,04DTS,03CTS,07CTS CURRENT 07STS4 09CTS4
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522 Posts
Discussion Starter · #1 · (Edited)
Hey guys, its been a long time I haven't posted on here I guess because everything has been well hope same for most of you.

about 2 weeks ago I started getting a "check gas cap" msg I tightened the cap and it still showed up then the SES light came on I pulled the codes and got a "PO496 - Evaporative Emission (EVAP) System Flow During Non-Purge" what does that exactly mean? lol

I checked the forums for this code didnt find anything....I'm guessing it just needs a new gas cap but just wanted to know if you guys think any different? I'm selling the car tomorrow afternoon so I need to figure out the problem.

Any help is always appreciated!
 

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2020 XT4, 70 Cougar conv, 2002 DTS
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908 Posts
If new gas cap doesn't fix it, check the EVAP purge valve on the back of the throttle-body. That valve is supposed to be closed at all times when the EVAP system is not purging, but it will leak if broken. You can take it off & try blowing air through it. If it allows air through it needs to be replaced. About $15 on eBay and elsewhere.
 
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