Code P0455 and P0441, EVAP failure cannot pass smog?

Tiny
JETTABOYS
  • MEMBER
  • 2008 VOLKSWAGEN JETTA
  • 2.5L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 136,000 MILES
I fixed a leak from a hose connected to the secondary air pump seems to have helped my fuel trims, I think. I smoked the system from the Evap hose in the front next to the fuel line and saw smoke come out of the right rear well. I took off the well cover and smoke was coming out of the leak detection pump filter with the car off. No other signs of smoke coming from anywhere else. Isn’t this system supposed to be closed off until activated? I removed the filter and plugged it with a rubber plug, smoked again, no smoke coming from anywhere else. I removed the smoke machine hose and plug, and it sounded like a lot of pressure was being released.
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Tuesday, January 24th, 2023 AT 3:36 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

As far as the P0455, that is identified as a large leak. If you clear the code, does it return? Is the fuel cap sealing?

As far as the P0441, that is also related to the EVAP incorrect purge. The two most common causes of this code are either a fuel tank cap or the vapor canister purge valve.

Have you checked either of these items? Take a look at the pics below.

Let me know.

Joe

See pics below.
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Tuesday, January 24th, 2023 AT 7:11 PM
Tiny
JETTABOYS
  • MEMBER
Joe, thank you for the quick reply.

Only did a visual inspection on fuel cap and it seemed fine.
In the image I’m providing below I checked figure 8, canister purge regulator valve, I think we might be talking about the same one. Anyway, I activated the solenoid a few times by jumping battery power to it. The harness had battery voltage within spec. And solenoid resistance it was within spec.
I didn’t check the purge valve to intake side for smoke leaks though.
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Tuesday, January 24th, 2023 AT 8:13 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Check the purge valve for operation and for a leak. Also, check the condition of the fuel cap. I have been seeing the filler tubes developing rust where the cap seats. As a result, it doesn't properly seal.

If you do find rust or corrosion, don't use sandpaper to clean it. Use a cloth material-type scuff pad to clean it. You don't want any sparks at that point. LOL

Let me know what you find.

Take care,

Joe
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Wednesday, January 25th, 2023 AT 6:41 PM

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