It means a fault was detected in one of your emmisions systems. a loose gas cap will turn it on along with a million other things.check to see if cap is on tight give it a couple of turns.it dont hurt it to make the clicking sound when tightening.
if it was loose it will take a while for the light to self eztinguish. it has to have 3 warm up cycles with no leaks from tank to aloww light off
other then the gas cap being loose you will have to have the code pulled at a shop and go from there
Hello
When the service engine
soon light a yellow light (Also called the check engine light or
engine management light) is turned on this is to alert you to the
fact that Powertrain Control Module (computer) has detected a
failure somewhere in the systems it controls you may not feel any
difference in the way the engine runs, this can be the transmission
or the engine or emission system, there are fault codes set in the
modules memory for these faults. What needs to happen now is to have
the powertrain control module scanned with a special tool called an
OBD2 electronic engine control scanner or a OBD2 code reader. Once
the code(s) are read then you must perform the diagnostics for each
code and make the appropriate repairs based on the findings of the
diagnosis that was performed, this is called doing "Pinpoint"
testing.
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