Service Engine Soon

PROBLEM: Service Engine Soon
FIX: Replaced Air Filter. Cost=$20.00
Note: Went to AutoZone and was diagnosed with code P0174. Consulted google and came up with a few possible point of failure. One item mentioned was air flow and air quality…then I remember right away that the air filter needs to be replaced regularly. Replaced the air filter and problem disappeared.
Tip #1. Replace Engine Air Filter regulary.
Tip #2. Try AutoZone [or any Auto supply] to get the diagnostic code and then search the web for any hints on possible point of failure.