It is usually telling you that something is low such as the fluid level on something... Or something is in need of service such as the 02 sensor or something of that nature AutoZone or a Midas will perform a scan on your system for free so long as the service engine light is on.
Brakes lock up on fast stops also horn doesnt work after truck is started.Horn works when key is off...
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Brakes lock up on fast stops also horn doesnt work after truck is started.Horn works when key is off could they be related?