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#1
10-19-2011, 05:41 PM
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O2 sensor
I have an 02 Mitsubishi Galant. For the past few months I have been driving around with the check engine light on. I went to the local Autozone and they told me my OBD port didn't work.. But when it came time to get inspected, the OBD came up with a bad Oxygen sensor. I promptly changed out the upstream sensor and the light went away. Then, a couple of weeks later, it came on again and once again it was the sensor that was diagnosed as faulty.
Now my question is: how common is it for an O2 sensor to go bad that quickly, what would be the cause, or could I simply have a sporadic problem with my OBD port?
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If it ain't broke, see how you can complicate it. 2002 Mitsubishi Galant ES 4 cyl Front-wheel-drive. Automatic. 
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#2
10-19-2011, 06:43 PM
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Re: O2 sensor
Sometimes a loose/worn pin in the DLC can cause issues with scanner communication, but it shouldn't set a light or anything.
Do you have the code number by chance? Depending on the code, you could have many issues causing a faulty O2 signal other than the sensor itself.
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