Jeep Wrangler Forum

Jeep Wrangler Forum (
-   YJ Tech Forum (
-   -   error code 21 (

60mg 01-24-2011 09:42 PM

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?

Garyk 01-24-2011 09:54 PM

How many miles on it, they're only good for so many, 80K i think

60mg 01-24-2011 09:56 PM

That sort of explains it :D - 170K

orfedj 11-07-2012 03:35 PM

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...


All times are GMT -5. The time now is 12:43 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.