The O2 sensor light came on in my Trooper. The light is on at all times but I notice no difference in performance, mileage, idle, etc. Do I need to buy a new sensor, and does the panel light have to be reset by a mechanic?

I'm kind of "old school" here; anything without a point-type ignition and carburetion is "new fangled" to me.

Thanks in advance,

Tato

im pretty sure there is a screw you need to move on the back of the dash board on the early obd1 rigs it was jsut a milage timmer i rember reading about that for the early rodeos so im assuming its simmiler

Yea you need to take out your dash and behind near where the speedo gauge would be there is a screw i believe its called KSW and you removie it from there and put it into the other KSW hole, it usually has tape over it, then the light will go away, it goes on automatically ever 60,000 miles i think...

Every 90,000.

the light comes on every 90,000 miles to remind you to change the 02 sensor. it has no diagnosis or failure notification duties.

even better than switching that stupid screw from one hole to another, just take out the bulb for the 02sensor idiot light so you don't have to do it again in 90,000 miles <img src="/forums/images/graemlins/rolleyes.gif" alt="" /> that's what i did...now that's old school.

to get to the back of the instrument cluster find and remove the 8 or so screws holding the outside trim piece (that surronds the insturments,radio,ashtray, cdplayer,etc) and remove it as you disconnect the a few wire connectors from the backside as you go. then remove the obvious screws for the instrument cluster and pull it out.

do you need to put a new 02 sensor in there? how old is it. if it's original it's probably not a bad idea, but it's up to you if you want to wait until it starts showing failure symptoms -- like failing smog check. some say 02 sensors degrade over time short of failure and affect performance and fuel mileage....

good luck
//bc

I just left the light on for 90,000 miles, then it went out. THAT'S old school.

DO NOT HAVE TO DO ANY OF THAT STUFF ON THE EARLY TROOPERS TO TURN THE LITE OF, THERE ARE NO SCREWS TO REMOVE OR REPLACE , JUST STICK YOUR HAND UP UNDER THE SPEEDO AND FEEL AROUND ON THE BACK SIDE OF THE SPEED AND YOU WILL FIND A SMALL SLIDER SWITCH, JUST MOVE THE SW TO THE OTHER POSITION AND THE LIGHT WILL GO OFF FOR ANOTHER 90.000 MILES , THIS WAS THE ONLY VEH THAT ISUZU USED THE SW ON ,EVERYTHING ELSE GOT THAT STUPID SCREW REPLACEMENT PROCEDURE WHERE YOU HAVE TO REMOVE THE INSTRUMENT CLUSTER, JUST SHOWS TO GO YA THE TROOPER WAS MADE A PRETTY SIMPLE VEH. JERRY

how early of a trooper, jerry?

cause on my 1992 trooper S sohc manufacture date april 1992, it's the stupid screw and i figure the 1993 has got to be the same. no?


//bc

Well, you learn something new every day!

Problem solved! Thanks, fellas <img src="/forums/images/graemlins/smile.gif" alt="" />