What might cause my 2011 Honda CRV check engine light to come on?

It's the check engine light. It could be a mIS Firing engine, a broken oxygen sensor or simply a loose gas cap. When You see the check engine light it doesn't necessarily mean You need to pull the car over to the side of the road and call a tow truck. It does mean You should get the car checked out as soon as possible. Oxygen sensors are a critical component of the fuel and emissions systems because they monitor the amount of oxygen in the exhaust and transmit that information to the engine computer, which adjusts the air-to-fuELRatio accordingly.If Your vehicle has a bad oxygen sensor, it could run irregularly or sound rough when it idles. A faulty oxygen sensor can impact Your engine's timing, combustion intervals, and other essential functions. You could also notice stalling or slow acceleration.