Either the flasher or the turn signal switch is bad.
check your fuses first, then check your bulbs and then your relay.
Turn signal flasher?
Check fuse,bulbs, flasher
On some cars the bulbs screw in from the rear and you have to take the light assy off to get to it.
Check the fuses and the bulbs.
Faulty light bulbs, damaged engine.
Check fuse, bulbs, and flasher relay.
replace the flasher(underneath driver side dash panel)
Check the bulbs, check the fuse then check the switch.
check your bulbs some bulbs have two filament on them one may be out and the other working.
It could be the turn signal bulbs, some vehicles use separate bulbs for the hazard and turn signals. It could also be a bad switch or wires for the turn signals.
Check for burnt out bulbs and could be a bad flasher as well.