89 Trooper 180,000 O2 Light

[phlux331]

Ok This may be a silly question but here it goes. I know that at 90,000 miles you O2 light comes on and the you are suppose to flip a switch or turn a screw to turn it off, what do I do at 180,000 miles flip the switch back? I have looked under the dash and couldn't see the switch that the mechanic was talking about. Plus now it seems that I am losing power on the acceleration or more to the fact it is sluggish off the start (it is even worse if the AC is on). Any help would be great!

[Charles Linacre]

Where is the reset for the O2 sensor on my 1989 Isuzu Trooper?

[nidansan]

Originally Posted by phlux331

Ok This may be a silly question but here it goes. I know that at 90,000 miles you O2 light comes on and the you are suppose to flip a switch or turn a screw to turn it off, what do I do at 180,000 miles flip the switch back? I have looked under the dash and couldn't see the switch that the mechanic was talking about. Plus now it seems that I am losing power on the acceleration or more to the fact it is sluggish off the start (it is even worse if the AC is on). Any help would be great!

I don't think this applies to the Trooper, I do have a 90 Pickup and there is a screw that you have to remove and insert into another slot. I have an 89 Trooper II 2.8 (6 Cyl) that had the sensor light come on, all I did was replace it and the light went away.

good luck!

[amigo-2k]

http://www.houlster.com/amigo/how-to.htm#O2_light

[ISUZORD]

[demotim00]

I have a 1988 Trooper and it had 96xxx miles on it when I bought it, and the O2 light on when I bought it. All I had to do was take the 4 screws holding the black gauge bezel off, than use the 2 screws holding the speedometer in, to take it out, and theres a switch that I flipped and it took care of it.

[ISUZORD]

"What do I do at 180,000 miles flip the switch back?"[/quote]
YES, that should take care of the light BUT remember that the light is a reminder to change your O2 sensor before it stops working which may be the reason for your loss of power.

"I have looked under the dash and couldn't see the switch that the mechanic was talking about."[/quote]
See photo and other responses; access is NOT from under the dash.

[jmarble]

What does the O2 sensor do? My '93 Trooper just turned 180k and the light popped on. Scared the wits out of my at first until I realized it comes on every 90k. I am trying to decide if I should replace it or not. I have some quirks with my Trooper but I don't know if it could be related to a bad O2 sensor or not. I know that it was NOT replaced at 90k. Just reset. Would a bad O2 sensor cause surging problems when first starting out in the morning? What does it do? Thanks.

[demotim00]

Being an 93 with 180xxx miles, and the O2 sensor not being replaced at 90xxx miles I would recommend replacing the sensor, as they usually arent expensive. I only paid $30 for my O2 sensor and that was for an 88 Trooper(4 cyl, i believe it was a 2.5L, but I already sold it and dont remember). In either case I would change it. O2 sensors can cause many different problems, some signs include surging, hesitation, gas mileage decrease, etc. Also replacing the sensor will not reset the light, so you will still have to reset it yourself afterwards, which on a 93, i am not sure how to do it, so you'll have to check that out for yourself. If your problems are not solved after the sensor is replaced, than it could be plugs or wires, or something causing your problem. Bottom line is since it hasnt been changed for atleast 90k miles, and since O2 sensors dont cost a shit load of money to change, it wouldnt ever hurt to change it at every 90k miles. Hope this helps.