just yesterday, i started to get a vibration while both in park and while driving. sort of feels like a cell phone vibration for both. no unusual noises. is it engine related since it does it while in park? maybe an idle problem? no engine light and no codes. HELP

 

Have you checked for code beside relying on the CEL light?
Sounds like a miss to me.
Perhaps a coil.
Good luck.

 

I did not know that a code could show without a cel. i was thinking along the same lines and if a coil is bad, i hope the code tells me which one.

 

A coil can be faulty and not show a code under specific conditions.
This is the one that's hard to pin down.
The cause is shorted turns causing lowered output that is not a hard fault to set a code.
Often it is intermittant and temperature sensitive in nature.
Good luck.

 

Might also want to take a gander at the fan/fan clutch/water pump for loose or wobble. Might be getting ready to have an issue. No codes will set for those items.

A code without a cel is called a pending code, not quite off enough to set a light. I don't think the Auto Zone readers will pick up pending codes.

Good luck.