Introduction
Follow this guide to remove the bulb from the O2 sensor warning light on the dash of a 1989–1994 Isuzu Amigo or Pickup equipped with a tachometer, to disable/turn off the light forever.
The oxygen sensor warning light permanently illuminates after 90,000 miles. It being on does not mean you need to replace your O2 sensor; it's just a reminder, although O2 sensor replacement every 90,000 miles is a good recommendation. It will continue to illuminate after oxygen sensor replacement.
The proper procedure to turn off the light is to move a screw on the rear of the instrument cluster from one hole to another to reset it. Then, the light will re-illuminate at 180,000 miles, and the process is repeated.
An easier solution is to just remove the bulb that illuminates the O2 sensor light. This does not require unscrewing the speedometer cable from the back of the cluster.
Note: Some emissions testing requires proof that the light is functional in order to pass a smog check. Some testers will check if the light illuminates at key-on. If it doesn't, you risk not passing. Keep that in mind before you take apart your dash.
What you need
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Pop the hood.
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Disconnect the negative battery terminal.
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Locate the sheathed speedometer cable. It runs along the firewall, at the back of the engine bay.
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Pry up the metal tab and unlock the speedometer cable, so it has slack and can shift back and forth.
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Inside, use a Phillips #2 screwdriver to remove the two screws holding the cluster surround in place.
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Adjust the steering wheel tilt to the lowest setting.
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Pivot the bottom edge of the cluster surround out towards the steering wheel.
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Pull the surround straight out. Keep in mind that it's still connected with cables on either side.
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Pinch and disconnect the two button connectors on either side of the cluster surround.
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Remove the cluster surround.
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Use a Phillips #2 screwdriver to remove the four screws securing the under-dash cover.
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Pull the under-dash cover straight out and remove it.
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Use a Phillips #2 screwdriver to remove the two screws holding the front of the cluster in place.
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Focus on the yellow marked areas.
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Use a long-shank Phillips #2 screwdriver to remove the two screws securing the bottom of the cluster.
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Slide the instrument cluster out, slowly. Rotate it, pulling the left side more than the right.
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Continue pulling the cluster out, pulling the speedo cable slack you made earlier through the firewall.
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Stop just when you can stick your hand behind the left side.
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Use your fingers to gently twist and remove the O2 sensor bulb.
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To reassemble the dash, follow these steps in reverse order.
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