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OneSlowEclipse
10-02-2002, 05:51 PM
OK so ever since I put the header on my car I have had a check engine light for the upstream o2 sensor. When Brian datalogged the car it said the sensor was bad. But since cooler weather has arrived my CEL went away?!? Why would it do that? I know colder air = denser air but why would that affect the 02 sensor any? TIA
303Racing
10-02-2002, 09:38 PM
I will come back on.

I couldn't say if it was due to the temps outside or not.
OneSlowEclipse
10-02-2002, 10:18 PM
I i have a pretty good guess that is is because of the temps. It has done it three times now, and each time it was when the temp had dropped below 60 degrees during the day. It just doesn't make any sense.
303Racing
10-03-2002, 09:31 AM
Yea it does, its broken.....buy a new one :D

96.77 from Conicelli mitsu.
DlandryTSI
10-03-2002, 09:49 AM
~$60 from mile high :D

--Dave
Hal
10-03-2002, 11:40 AM
I would suspect you damaged the sensor wires during the header installation.

Replace it.

Hal
OneSlowEclipse
10-03-2002, 05:26 PM
Wow those were some helpful answers Dave and Hal. The funny thing is I didn't ask if it needed to be replaced. I know its broken, if I had an extra hundred bucks I would have replaced it a while ago. I am SO sorry I wasted your time with my petty questions.... I forgot real answers are reserved for members of the board that are boosting.
Hal
10-03-2002, 05:43 PM
No problem... glad to be of help
XakEp
10-03-2002, 06:58 PM
Here's why they say its broken... See, when the temps outside drop so low, the aor gets denser. Plain physics... So, when the O2 sensor starts reading more air, it starts seeing readings that seem closer to normal, hense the CE light goes off. The air heats up, it goes off...

Why?

Most likely because the element in the sensor is burned through at some point. Maybe it could be that the element itself got contaminated and as a result isnt reacting with the exhaust gases to produce the needed current.

In other words, its broken, and unless you want to get out a soldering iron and call a chemical supply firm its most likely that you will have to simply replace the unit to get your car running right.

If you want a better explanation from us you should probably contact the engineers that designed the O2 sensor in the first place. ;) But thats just me...
303Racing
10-03-2002, 08:44 PM
:o