Why is my 2011 Honda Odyssey check emission system light on?

You're driving Your 2011 Honda Odyssey when You notice a light has appeared on Your dashboard. This happens often, and is usually an indication that it's time for a routine fluid and components check. In the case of the check emission lights, it is usually caused by a gas cap that was left loose, or a leak from the evaporative system. Alternatively, it could be caused by a faulty charcoal canister, fuel pressure regulator malfunction, or a bad or failing throttle position sensor. Any component that is failing will ultimately need to be replaced. A new regulator can cost between $30 and $130, and a new throttle position sensor can run You from $50 to $140.