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-   -   O2 sensor madness (http://forums.pelicanparts.com/porsche-928-technical-forum/678231-o2-sensor-madness.html)

alphaseventwo 05-16-2012 08:06 AM
O2 sensor madness
 
Can anyone explain to me the whole 2 wire vs. 3 wire O2 sensor issue? The old O2 sensor is a 2 wire, the new replacement sensor is a 3 wire...

kelanel 05-16-2012 09:55 AM
Good read: Oxygen sensor - Wikipedia, the free encyclopedia

Quote:
The probe typically has four wires attached to it: two for the lambda output, and two for the heater power, although some automakers use a common ground for the sensor element and heaters, resulting in three wires. Earlier non-electrically-heated sensors had one or two wires..
Basically 2 wire sensors had 50,000 wear cycle due to not being heated vs heated being double at around 100k.

alphaseventwo 05-16-2012 09:59 AM
how would you recommend wiring a 3 wire sensor when its replacing a 2 wire sensor then?

kelanel 05-16-2012 11:50 AM
is this for a US or euro 83? euro would be CIS and the 2 wire sensor added in federalizing it might have been jerry rigged. my us 84 uses 3 wire and its the same l-jet system as yours, something seems amiss here.....

alphaseventwo 05-16-2012 02:38 PM
Thanks for the info everyone. I'm just going to say that I am apparantly brain-dead because it turns out that I have a 3 wire system all around, and don't know what I was thinking.

19psi 05-16-2012 03:19 PM
Hey, a local Cheesetown guy! I'm in the Boone Grove/Hebron area.
Are you going to the car show in Valpo on the 27th?

alphaseventwo 05-17-2012 09:48 AM
well i doubt my 928 will be there on the 27th, but i will be...


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