Service engine soon light came on and later that day turned off

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Need a different mechanic

They never tested anything,
if you got codes

code p 442 refers to evaporative emission (EVAP) system---small leak detected
it also refers to large leak detected --fuel cap off/loose === causes hose/connection,-- intake leak--EVAP canister---EVAP canister purge valve --mechanical fault --- EVAP pressure sensor

it means emission control malfunction, could be one of many causes, have the engine scanned by a competent tech

The check engine light/service engine soon (yellow light) comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system u will seldom feel the car engine run any different, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.

The service engine light is totally safe. If it's just the ABS light, it's safe as long as you don't panic stop on the way to the shop.

that means it needs service. also probly means that something is either loose or broken wise. you were probobly receiving a service engine soon signal when you put the keys in the ignition and turn it one slot to where the car is running on battery so the radio should work. and thats where the idicators would of been going on. and you probobly didnt notice those

there are special tools needed that only dealers and some trans shops will have.Definitely a no-no for back yard mechanic

check the back of the connector of the radio make sure it is connected check ur audio settings and if there is still a problem let me know