Fiat 124 Spider 2019 Owner's Manual page 77

Under U.S. federal law, any modification
to the original-equipment emission
control system before the first sale and
registration of a vehicle is subject to
penalties. In some states, such
modification made on a used vehicle is
also subject to penalties.
While the engine is off, the sound of a
valve opening and closing can be heard
at the rear of the vehicle, however this
does not indicate an abnormality. The
vehicle has a self-checking device and
it operates while the engine is off.
Warning!
A hot exhaust system can start a fire if you
park over materials that can burn. Such
materials might be grass or leaves coming
into contact with your exhaust system. Do
not park or operate your vehicle in areas
where your exhaust system can contact
anything that can burn.
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