Question about 2000 Mitsubishi Montero Sport

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O2 sensor ihave 2000 sport i chg the sensor but the ck eng light is still on

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You need to have the code read to tell you exactly where the problem is. Also you need to disconnect the batt for about 30 minutes to allow the computer to reset. And last but not least are you sure you replaced the proper O2 sensor, there are 2, one on the header and one behind the exhaust.

Posted on Jul 23, 2009

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How many eng. Sensors on a 2000 GMC safari 4.3L Replaced mass air flow crankshaft sensor and ck eng. Lite still on. What's next O2 sensor? Thanks


Have it scanned so we can try to pinpoint the issue before you spend money on a nonissue. Codes can direct you to the circuit or sensor problem.

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2001 Montero Sport up stream oxygen sensor has failed. My check engine light came on and tried to drive vehicle at night and my lights went dim and the truck quit.


This has nothing to do with you O2 sensor. You have more than one problem. An O2 sensor will not cause what you just described. It will cause a check engine light but not the dimming of lights and a stalling issue. Check your charging sytem ( battery and alternator )

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1 Answer

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Sounds like an O2 sensor, go to An autoparts store like Schuck's, Autozone, or O'Reilys, and they will be able to a free scan for you, and tell you what your check engine light is on for. Or if it isn't on they could still tell you if it's a bad O2 sensor by reading the live data levels. Good Luck! :)

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1 Answer

Open circuit in o2 sensor from the ck eng codes 60000 miles on the trk never had a problem could this be cat w/bad function code


An open circuit code for an O2 sensor would not be a catalytic converter. An open cicuit code would normally indicate a faulty O2 sensor. 60,000 miles would be about right for this sensor to go bad, especially with all the additives in todays fuel. Hope this helps

Jul 18, 2009 | 2002 Chevrolet S-10

1 Answer

No ck eng. lt, but have error codes on scanner


Yes. 1 is a bad O2 sensor and the other a mis-fire.

Best thing to do is a major tune up (replace plugs/wires/fuel filter/PCV valve/etc...) and also replace the Bad O2 sensor.

Running it like this can cause long term damage. Let alone you are losing gas milage as well.

Good luck.

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1 Answer

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IF YOU ARE GETTING AN O2 SENSOR HEATER CIRCUIT PROBLEM IT IS PROBABLY A FAULTY 02 SENSOR POST THE CODE AND WE CAN NARROW DOWN

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sounds like it , the sensor should be on the exhaust somewhere,whith wires on it

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