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Ron, ASE Certified Technician
Category: Honda
Satisfied Customers: 36059
Experience:  ASE Certified Tech 34 years.
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Looking solution to CEL, On. Code of P0455 and P0497, 2008

Customer Question

Looking for a solution to CEL
JA: Does the light stay on, or does it blink?
Customer: On. Code of P0455 and P0497
JA: What is the model/year of your Honda?
Customer: 2008 Civic EX, 1.8L
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Replaced gas cap with OEM, replaced Solenoid purge valve.
JA: Anything else you think the mechanic should know?
Customer: Don't have access to a smoke machine.
Submitted: 1 year ago.
Category: Honda
Expert:  Ron replied 1 year ago.

Hello and thank you for your question.

These code indicate you have a large leak detected in the EVAP system , start first with making sure the gas cap is secure and tight and if so the the common cause for this code is a stuck Evaporative Emissions (EVAP) Canister Purge Solenoid/Valve which if so means it will need to be replaced. Before you replace anything start first with running the test steps to determine if in fact thats purge valve has failed. See the steps to do this in the link below.

See the location and replacement steps for the purge valve in this link. Post back if you have more questions and or need more help and we can work from there.

Customer: replied 1 year ago.
If you see in the original question, I have already replaced the purge solenoid valve.
Expert:  Ron replied 1 year ago.

Okay then the next step would be to run the pinpoint test, you have a leak some place and the second usually suspect is the Evaporative Canister Vent Shut Valve. The test steps should verify either way. See its location in the link below.

Customer: replied 1 year ago.
Ok, I will try that next.
Expert:  Ron replied 1 year ago.

I would check it first but these are the two very common parts to fail. The testing will verify. Let me know the results and Im here if you need me.