CEL appears then DISAPPEARS?

[PENN]

About 4 days ago I got a CEL, and I stopped by O'Reilly Auto for a free CEL test.

Got code P219A which apparently is a Air/Fuel Ratio Imbalance code.

About an hour later the CEL it no longer there.

Is this normal?

Should I just ignore it, or still get it checked out?

 

[averyislost]

I would get it checked out for sure, even if the CEL isn't on right now I'm sure the code is still sitting in your "pending codes" category. Do you have an aftermarket air filter/crossover pipe/etc? Sounds like a possible vacuum leak somewhere

 

[mk_not_a_robot]

Check the two Oxygen sensors on the catalytic converter as well, that can cause the 219A code as well.

 

[PENN]

I would get it checked out for sure, even if the CEL isn't on right now I'm sure the code is still sitting in your "pending codes" category. Do you have an aftermarket air filter/crossover pipe/etc? Sounds like a possible vacuum leak somewhere

I only have a drop-in Cobb Filter.

 

[PENN]

Got it checked out today, and turns out it was nothing.
Everything is in good order.

Maybe bad gas?