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Old 05-09-2008, 10:29 PM   #1
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New o2 sensor, need to retune?

So I've searched with no results. But do I need to go back and re-tune my car if I get a new o2 sensor? I wouldn't think so, knowing what they do and a baisc understanding of how they work. But I want to be 100% certain before I go putting a new one in.

Before anyone says keep the one I have; Yes, I do need a new o2 sensor. When my car was tuned, it did not give a signal until the engine was warmed up (and the o2 was warmed up) and it's signal cut out a few times after it was fully warmed up on the dyno.


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Old 05-09-2008, 10:36 PM   #2
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you dont have to retune after a new o2 sensor. just unhook the batt for 15 mins and then drive the car around for at least a half hour and the car will be like new
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Old 05-09-2008, 11:19 PM   #3
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Correctamundo.
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Old 05-09-2008, 11:27 PM   #4
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even with the "adaptive learning" system shut off (in the tune I have), I'm not seeing why I'd have to disconnect the battery and go for a drive afterwards
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Old 05-10-2008, 02:05 AM   #5
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in essence you dont have to disconnect the battery its just reccomended to do so and then drive around so it relearns everything in case having the bad o2 sensor messed with anything in it
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Old 05-10-2008, 10:09 AM   #6
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Quote:
Originally Posted by jeeptofocus View Post
even with the "adaptive learning" system shut off (in the tune I have), I'm not seeing why I'd have to disconnect the battery and go for a drive afterwards
you are correct there is no point.


if you are running open loop100% of the time you dont even need an o2 sensor...


if you are running in closed loop with the adaptive functions turned off, then there is a slight chance that the tune is based on a fuzzy signal from the o2, the only way to find out is to try it, just watch your A/F and knock
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Old 05-11-2008, 11:17 AM   #7
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Actually even with adaptive turned off there are still portions of the ECU that still... well basically they still use adaptive... stuff like your idle control.

So yes you should still disconnect the battery and reset the ecu. after a day or two you should at least go out and take a datalog.... and keep an eye on your AFR, just in case.
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