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If your 2018 Honda Odyssey is experiencing emission issues, there could be a few possible causes. A potential culprit could be a malfunctioning O2 sensor in the vehicle, which may lead to an imbalance in the air-fuel mixture and result in a noticeable gas odor. If you detect this smell and determine that it is not related to a sensor issue, it could indicate a problem with either the catalytic converter or the purge valve. Identifying these specific faults can be challenging, but they are likely to trigger the check engine light, prompting you to have the vehicle examined using an OBD scanner. Additionally, it's advisable to ensure that the gas cap is tightly sealed and free of any cracks, as a loose or damaged cap can also contribute to emission problems.
Typically, emission system issues in a 2018 Honda Odyssey are often connected to the failure of the EGR valve.
I just received the warning sign as well. I did some research, replaced the cabin filter, and the warning sign disappeared.