Well if they quit all together and your signals don't work, then the bulb probably needs replacing. If the lights don't flash and just stay on then that would be a flasher/relay. If it is just the hazards then you are more than likely right, it is just the fuse. Since i don't know which year or model that you have i am not too sure if the fuse is in the vehicle under the steering wheel to the left, or if it is under the hood on the drivers side (will be a black box that you can remove the cover from). Usually there will be a diagram of what fuse goes to what and what size it is (10amp, 20amp, etc.) on the cover of whichever one that you take off. If for some reason that it is not there you can go down to your local parts store and pick up a Chilton or Haynes vehicle specific manual (always good to have anyways, just in case) and that shouls tell you exactly where it is. The cost of one can be anywhere between $15-$30 but well worth it!
Have a good one!
SOURCE: All my blinkers and brake lights stopped working
PO430: Catalyst System Efficiency Below Threshold (Bank 2)
Here is a site that you should go to and further look at the common problems with your catylitic converter, and also your other emissions systems. Hope it helps, and please rate!!!
http://www.discountconverter.com/catalytic_converters_news/news_page.cfm?Key=codes-po420-po421-po430-po431&News=120
SOURCE: 98 mazda b2500-my turning signal/hazard lights no longer work
You need to replace the flasher module, this is the module that controls the "Blinking" function of the lights, its a mostly a common part that you can get at any auto parts store for less than 10 bucks and is located in the Fuse panel under the dash, its round in shape in one corner of the panel. mostly they are green in color.
SOURCE: 2001 jeep Tj pdc diagram trying to locate fuse for
sounds like it is either flasher or switch assembly.
SOURCE: hazard lights do not work fuse good how to replace
If you will look under teh dash at your fuse panel you cannot miss the round relay
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