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85 Targa
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Need Help 02 sensor
Oxygen Sensor for my 85 Porsche 911 Carrera issue.
I had to replace my catalytic converter and the oxygen sensor. The old O2 had seized up in the old Cat.The old O2 had just one black wire to it. I ordered a new Bosch OME Oxygen Sensor and it came with 3 wires (one single black plug….ground I guess) and (one two prong plug white and black). I found where the single (ground wire?) went the ground headed to the DME ground. I would assume that the other two prong plug should go somewhere in the eng compartment. I have look hard for a plug with one green wire and one yellow wire (going by my electrical wiring diagram). I can't even find any wires not being used. Any ideas I forgot to mention that my car is a Euro. Maybe thats why I can't find the yellow and green plug wire. What do you think? Thanks Brian Last edited by BrianW-n-SC; 11-14-2009 at 02:31 PM.. Reason: I forgot to mention that my car is a Euro |
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11-13-2009, 03:18 AM
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Registered
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85 carrera has a 3 wire o2 sensor. One wire is the sensor the other two wires are to heat the sensor. I don't know why your 85 had a 1 wire sensor installed. There should be two plug receptacles in the engine compartment one for the 2 heater wires (two white wires) and one for the sensor wire. Maybe someone installed a 1 wire o2 not knowing it was supposed a three wire sensor.
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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11-13-2009, 01:30 PM
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Registered
Join Date: Sep 2009
Location: North of You
Posts: 9,160
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A one wire sensor should work provided it is connected properly, as should a 'three wire' connected as a 'one wire'. The heater circuit just makes the sensor get to operating temperature more quickly, and therefore cuts emissions when the engine is cold. Once it's warm you should be fine.
So, if you have all three wires there, as you should, connect them all. But alternatively you can use the three wire as a one wire. I think... |
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11-13-2009, 02:23 PM
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grateful user
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a one wire bosch from any parts store will work fine, and will last longer, plus they are only 20 bucks. the heated sensor is not really necc. and some cost big bucks.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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11-13-2009, 02:56 PM
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Registered
Join Date: Sep 2009
Location: North of You
Posts: 9,160
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11-13-2009, 04:15 PM
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Baby
1974 Porsche 911 targa 2.7
75 Porsche 911
bike
1970 porsche E
