Hello Scotty,
I have a 2011 Honda Odyssey Touring with 130k miles, about 3 months ago the fuel cap light turned on.
I changed the fuel cap with an original replacement from Honda. Erased the code but then turned on again.
I left it on for a while then the check engine light turned on.
Checked for the error codes and had a P0497 and P145c codes. Cleared the codes but the check engine light came back.
I’ve read that it be may be the EVAP solenoid or purge valve.
I have an Autel autolink AL539.
Could you direct me on the next steps?
Thanks and God bless! Ray
The codes can be set by either a faulty vent valve, fuel tank pressure sensor, or purge valve, and your Autel scanner can't control the evap system valve solenoids to easily diagnose the issue.
But before crawling under the van the easiest place to start (and a likely candidate) is testing the purge valve.
Those codes can be set if the purge valve is sticking closed (when commanded open by the computer) or is crudded up inside and not allowing manifold vacuum to suck fuel vapors into the intake.
Without a bidirectional scan tool you can use a manual hand vacuum pump and a couple of jumper wires to test the operation of the purge valve. (you can get by without the hand vacuum pump and just use your finger to feel if manifold vacuum is getting pulled through the purge valve with engine running and power and ground being "jumpered" to the 2 pins on the purge valve).
Yeah leave them cancer vent valves often go bad on those. But a leak anywhere will do that. The best thing to do is to get a smoke machine hooked up to the evap system and check it for leaks using the scan tool and activating various sections to see what's leaking
