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Old 01-24-2011, 09:42 PM   #1
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error code 21

Oxygen sensor related. what are the chances it is connections issue it pops after some time of driving, lately rather quicker than normal and highway quicker than on the streets. It starts up fine, works for a while and then comes on. Disappears after restart till next time and it keeps on going like that. No idling issues, accelerates fine, I guess other than the light nothing is out of the ordinary . Any thoughts?

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Old 01-24-2011, 09:54 PM   #2
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How many miles on it, they're only good for so many, 80K i think

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Old 01-24-2011, 09:56 PM   #3
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That sort of explains it - 170K
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95 YJ Rio Grande 2.5L 5-speed (We're at point "A". Where is point "B"? Who gives a sh..!? )
02 Triumph Sprint RS 955i (speed junky)
04 Honda Odyssey EX (parent-mobile)
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Old 11-07-2012, 03:35 PM   #4
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sounds familiar

I'm experiencing the same exact thing in my 95 wrangler...

Very intermittent trouble code 21... Last time I reset the codes, it roll 163 miles for the good to return...

Did replacing the O2 sensor resolve your issue?

I've heard code 21 can be falsely caused by a number of things...

Before I buy a new sensor, I'd like to pinpoint the problem...

Thanks
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