O2 Sensor?
 

Question: does disconnecting the O2 counter behind the speedometer disrupt the funtion of the O2 sensor. I have an 81 SC and the counter was ticking away so I just pulled the whole plug off, about six wires total.
thanks for the help.

Jason
81 SC

No, this box actually has nothing to do with the O2 sensor, but is purely mileage-driven. Mine made noise too and I also made it quiet. I did this by disconnecting a ground connector. I was afraid of injuring other electronics, like the speedo, so this is the reason for just unplugging a ground, not radical surgery. Perhaps radical surgery works just as well.

But the answer is no, your car does not need this mechanism at all. the mechanism is designed to bring you and your car to a dealership with a worried look on your face.

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'83 SC

What is the life expectancy of the O2 sensor?

1984 - 3.2 engine. Pelican is looking for $200 for a new one. Just thinking of preventive maintanace on my 70,000 mile engine. Was going to replace the heat sensor and O2 until I saw how much it costs.

Dave

Other members have explored the question of O2 sensor, and their replacment strategies, and I strongly suggest you do a search. It can save you money.

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'83 SC

The Porsche-specific O2 sensor on our cars is made by Bosch, and if you rewire a Bosch O2 sensor with the Porsche harness, it works the same way. There are models which are an exact fit and simply need the harness change. And they're a fraction of the cost of the Porsche part.

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Mark Szabo
1986 911 Targa 3.2
1987 Escort 5-speed 1.9
The 911 Gallery

if you do a search on 'o2 sensor' threads here on this bbs, you'll find a discussion that talks about replacement using bosch o2 sensors from other cars at a fraction of the cost. you just have to make sure you have a bosch 3 wire sensor, and then you can just splice. i did this on my car last year and cured a pulsing problem when accelerating at lower rpms. i bought a sensor that was from a ford, i believe. i paid $50 at a pep boys. it took a little while to find one, though, cause the salesperson was being a jerk and didn't want to look through any of the sensors. i probably could have found one even cheaper if he would have humored me. if i can find the box from the sensor, i'll post the stock/part number up here for anyone who would like to save some money.

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Adam Nitti
ajnitti@mindspring.com
www.adamnitti.com
'85 911 Carrera Coupe

dave:

found it! the sensor i used was a bosch, part #0 258 003 942 009. the stock # on the box is 13942.

this is a 3 wire sensor with a different connector. you just need to cut and splice. hope this helps-

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Adam Nitti
ajnitti@mindspring.com
www.adamnitti.com
'85 911 Carrera Coupe

Great info here. Thanks! I had heard that this may be possible, but was slightly afraid of making such an effort. Are the colors the same for the splice? Sounds like a great idea at 25% the costs.

Dave

yes, you can splice by color. i believe there are 2 whites and a black. just match either white to white, and black to black...

good luck!

the sensor might be a pain to get off... when you reinstall, take the advice that i was given up here and make sure to apply anti-seize compound to the threads.

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Adam Nitti
ajnitti@mindspring.com
www.adamnitti.com
'85 911 Carrera Coupe

Adam, Mark and Superman,

Thanks!

Dave