In this video I will go over and what it means if you have a flashing check engine light. And typically with a flashing check engine light, it means you have a catalyst damaging misfire.
I was working on a Toyota 4Runner in this video and removed and inspected the ignition coil. The computer was setting a P0304 for a cylinder 4 misfire. But any cylinder misfire can cause a flashing check engine light.
If you have any tracking flashing check engine light you should definitely get it repaired immediately due to the damage it can cause to your catalytic converter. And that is because the unburnt fuel is going into your exhaust system. Which can cause your catalytic converter to overheat and be ruined or damaged. A flashing check engine light is typically usually relatively inexpensive repair though. Most commonly involving spark plugs and or a bad ignition coil.