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Re: 1998 nissan frontier 4x4
Well since the lights are controlled by the OBD (on board diagnostics), you'll have to reset it. You may be able to do this by simply disconnecting the battery for a few hours. However, a lot of newer vehicles have electronically locked radios which require the manual to be able to be re-enabled.
I'd check out the radio before disconnecting the battery.
The only other ways are to physically disconnect the lights in the dash or get someone with an OBD reader to clear the codes.
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Couple of questions....
when you step on the brakes pedal do the other brake lights work?
does the third brake light go out with the brake switch unplugged?
have you checked for trouble codes in the abs module?
You may need a new fuel level sending unit. Check Nissan's help forum. You can get a free login and than will be able to download upto two files a day. Check their service bulletins out. They had a problem with the older Frontiers and created bulletin NTB99-064 check and see if any thing new has come about. This bulletin details fixing a ground connection under the passengerside kickpanel. Your check engine light may be something else, you might check and see if any of your local part shops do free code reads. FYI My 1998 frontier had a similar problem which I ignored until it started blowing fuel pump fuses. Turned out the fuel level sender started to short out and take the fuses.
With a volt meter and the engine at idle, check the voltage at the battery.It should always be just over 12 up to 14 volts. At idle with no accessorys on (lights, fan, radio ect.) The voltage should stay just over 12 volts. As you turn on all the accessorys the voltage should rise up to between 12-14 volts.
Also, a new battery needs to be fully charge before use. Most new batterys sit on the shelf and lose charge. My last new battery needed 8 hours of chargeing to be fully charged.
I hope this helps.
i had this problem with my 98 nissian frontier it was 2 things  my battery was dead and was not holding charge the belt that runs over the alternator and the radiator fan was really worn i had to replace batter and belt
kenchyke, the shop may have disabled the air bag system to work on the car, and possibly forgot to activate it again. While this seems a bit odd to me that they could overlook this but, since it started after the work was done, you need to return it to the shop asap to have them check it out. Although the car runs fine, the abs system and the air bags won't operate, which could result in injury if you are in an accident (air bag will not deploy, abs probably disconnected).