Go back to previous topic
Forum namePerformance/Engine
Topic subjecthey ladies.. whats a code 21 MEAN????
Topic URLhttps://forums.2gnt.com/dcboard.php?az=show_topic&forum=i5&topic_id=77595
77595, hey ladies.. whats a code 21 MEAN????
Posted by tim97rs, Jul-13-04 06:33 PM
its the "upstream o2 sensor stays at center"

WTF does that mean?
77596, RE: hey ladies.. whats a code 21 MEAN????
Posted by Uberingram, Jul-13-04 06:35 PM
Who cares. :shrug Reset the ECU and if it comes back buy a new sensor.
77599, RE: hey ladies.. whats a code 21 MEAN????
Posted by djtrickee, Jul-13-04 07:03 PM
Originally posted by tim97rs
its the "upstream o2 sensor stays at center" WTF does that mean?




Uh-OH!!!!!! we gotta code red here!! thats some serious trouble! or not. lol. I would imagine you should start to look for a new O2 sensor? does your A/f cycle? I know you are running a widband, how does that read?

i see this in your future?!?!

77600, RE: hey ladies.. whats a code 21 MEAN????
Posted by DarkOne, Jul-13-04 07:12 PM
It means exactly what it says. The voltage doesn't swing high and low like it's supposed to - it stays at center. There's also a code for voltage stays low, and voltage stays high.
77603, RE: hey ladies.. whats a code 21 MEAN????
Posted by tim97rs, Jul-13-04 08:32 PM
Originally posted by DarkOne
It means exactly what it says. The voltage doesn't swing high and low like it's supposed to - it stays at center. There's also a code for voltage stays low, and voltage stays high.


so what does that mean in terms of the o2 sensor? its goin tits up?
77607, RE: hey ladies.. whats a code 21 MEAN????
Posted by mcgyvr, Jul-14-04 04:01 AM
its either shot or your wiring has a short.
probaly a bad o2 sensor from you runnin pig rich or something
77608, RE: hey ladies.. whats a code 21 MEAN????
Posted by DR1665, Jul-14-04 05:10 AM
Originally posted by mcgyvr
probaly a bad o2 sensor from you runnin pig rich or something


Yeah. Pouring raw fuel out the tailpipe is pretty rich man. :thumbsup I'd pop for a new O2. If it's still there, then you've more than likely got a wiring issue.