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The O2 sensor automatically comes on after so many miles, doesn't even have to be bad. You have to take the dash down and there is a tiny little screw that you need to move. The light will go out, but it will.still work. It's been awhile since I did this, but I believe it almost directly below it.
I have had a problem like that on my Isuzu Rodeo Turns out the o2 sensor was bad. The computer reads it as not enough fuel. The mass airflow sensor will dump more fuel causing the engine miss fire. You might check the codes again and see if you get the code for the 02 sensor. If so you can try to unplug the 02 sensor, the ck engine light will remain on, however the car should run without any issues. Good Luck!!
The O2 sensor needs to be replaced. There is a screw on the back side of the instrument panel that is removed and switched to another hole in the circuit board to reset the light for another 90,000 miles. Only a shop manual will have the exact location. You can try and obtain one from http://www.helm.com and buy one using print on demand.
what is a o2 light ? sounds like you need to take it to a shop and have some one check it out and stop trying to throw parts at it . sounds like tun up proublems and maybe the check egin lights on because one or more sensors have a proublem
if you follow your exhaust system you will find the o2 sensors they could have one right off the exhaust manifold and your second o2 is going to be behind the catalytic converter. so you will have a o2sensor before and after the catalytic converter on the exhaust hope this helps you out.
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There should be a reset switch that turns the light off. Some vehicles require a code scanner tool to reset the check engine light. On some Isuzu models you have to remove the instrument cluster and move a screw from one hole marked KSW to another hole with the same KSW marking (it may have tape over the second screw hole). Other Isuzu models may have a small switch on teh back of the instrument cluster or may have a different marking on the screw holes (some were marked wit the letter B on both holes). The O2 light usually comes on at 90,000 mile increments which is when Isuzu recommends changing it.