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Old 09-29-2011, 09:39 PM   #1
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Join Date: Jul 2010
Location: CT
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o2 sensor

So I have been plagued by a p0420 code for the last 6 months. i was recently going to swap the O2 sensors in an attempt to figure out if it was the O2s or the minicats. I took one sensor out only to realize that the wiring was too short on the other one to switch them. There has not been a check engine light on in nearly two weeks now, which has not happened in months....Why?

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Old 09-29-2011, 11:18 PM   #2
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Could be something as simple as a poor connection on the rear sensor and you unplugging and plugging it back together cleared it up.

And if memory serves me, 0420 would be the rear sensor reading poor performance from the cat. So it shouldn't be the front one.
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