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You need an OBDII reader, I got mine at Auto Zone (can't think of the brand right now, but it's orange and was about $150), I've seen them for less, though and they work on all OBDII cars. Follow the instructions, write down the code incase it keeps returning, then erase the code and the light goes out. Good luck!

You can also try disconnecting the battery for about 20 minutes and then reconnecting it. It should clear it out. It worked for me. However I would go to Auto Zone first and atleast have them check the code. They will do it for free and at least if it comes on again you will know if it is the same problem.

I did the battery thing after having it checked at Auto zone and it cost me nothing. I then went and passed my emisions test.

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9y ago

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You can buy an OBD2 (on board diagnostic 2nd generation) reader that will plug into your truck and read or reset codes. Innova sells one that I just bought and I reset my service engine light with it. I bought it at Canadian tire, reg price $249 Canadian on sale for $149..I also heard if you unplug your battery cables for a half an hour you will reset your computer/engine light but you will lose any radio presets you have.

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13y ago
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well shannon your computer has detected a problem with the emissions system and it will need to be corrected before the light will go out. It can be reset by disconnecting the battery for a few minutes or with a scan tool but it will just come back on if you do not repair the problem that caused it to illuminate in the first place. Have the cars codes scanned and see what needs to be repaired.

Isuzu Rodeos made in or after 1995 have a port under the dash called an OBD-II (On Board Diagnostics) port typically located between the steering wheel and the pedals. You can typically hook up an OBD-II reader that can read the vehicle's OBD codes and tell you why the check engine light is coming on, and most will give you the option to reset the light -- though it's usually a good idea to address the problem. You can buy an ODB-II reader at many stores that sell tools and automotive parts and accessories or you can ask one of your mechanic or car savvy friends if they have an OBD reader and if you can borrow it.

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11y ago
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You go to a reputable shop, pay them 1/2 to 1 hour of shop time for them to plug your Mountaineer into their diagnosis computer, and figure whats wrong, and how to fix the problem. It could be simple or it could be a major problem, but like anything, the longer you ignore, it will most likely get worse and make the repairs later more expensive. OR, you could find a buddy that has purchased an OBD-II code scanner from the local parts store and they can retrieve the codes and reset them also. But, if the problem is not fixed, the light will come on again in due time.

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17y ago
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The 1999 Mercury Mountaineer 02 sensor is secured to the firewall with two retaining screws. Remove the two retaining screws. Remove the O2 sensor hose. Reverse the process to install the new sensor.

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10y ago
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You can reset it with an OBDII scanning tool or by disconnecting the negative post on the battery for about 30 seconds before reconnecting it. Although both of these procedures reset the check engine light (CEL) by erasing the stored trouble code(s), the CEL will illuminate again if the problem that caused it to illuminate hasn't been taken care of.

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15y ago
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Easiest way is to disconnect the battery cable (negative) for a couple of minutes, then reconnect. This clears the computer. If everything is OK, Check Engine will stay off.

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9y ago
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Try disconnecting battery for about 10 mins. If this does not work have vehicle scanned to determine problem or have codes cleared

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Wiki User

17y ago
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Q: How do you reset the check engine light in your Isuzu Rodeo?
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