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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
Posts: 935
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Oxygen sensor - extra connector?
'86 Carrera: I was troubleshooting why my license plate lights aren't working (a whole other puzzling matter...) and noticed that there are TWO 3-wire connectors in the engine compartment that the oxygen sensor can plug in to.
One connector is located under the fuel pump and comes from the front of the engine compartment (gray harness). The other connector comes out of the wiring harness underneath the engine compartment fuse/relay panel, and is wrapped in electrical tape. What is this connector? A/C maybe? I'm puzzled... Thx! JB
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'86 Carrera Cabriolet '73 911T Sporto (RIP) '90 Miata LeMons Contender! '71 Datsun 510 (RIP) '67 Fiat 124 Sedan (RIP) '72 Ford Pinto (RIP) '62 Plymouth Valiant '60 Ford Galaxy 500 (RIP) |
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10-07-2010, 11:21 AM
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Get off my lawn!
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The other one is the head temp sensor as I remember. That is pretty important!
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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10-07-2010, 11:36 AM
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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
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The CHT sensor IS important, but that's not it. That sensor has a square connector that plugs into the bracket by the left intake. The 02 sensor has a round three-pin connector, and it's this connector that can go into one of two connectors I located.
Thx! JB
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'86 Carrera Cabriolet '73 911T Sporto (RIP) '90 Miata LeMons Contender! '71 Datsun 510 (RIP) '67 Fiat 124 Sedan (RIP) '72 Ford Pinto (RIP) '62 Plymouth Valiant '60 Ford Galaxy 500 (RIP) |
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10-07-2010, 11:50 AM
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Registered
Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
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Quote:
The connector out of the fuse/relay compartment, may be your rear window de-fogger connector. As I recall, one of the pins is not used. Pin #1 not used. Pin #2 is the first stage defogging. (center element). Pin #3 is the second stage defogging (upper and lower elements). Good luck, Gerry 
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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10-07-2010, 12:20 PM
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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
Posts: 935
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Ah... that makes sense as to why it is not connected to anything - I have a cab! Thx!
Jim
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'86 Carrera Cabriolet '73 911T Sporto (RIP) '90 Miata LeMons Contender! '71 Datsun 510 (RIP) '67 Fiat 124 Sedan (RIP) '72 Ford Pinto (RIP) '62 Plymouth Valiant '60 Ford Galaxy 500 (RIP) |
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10-07-2010, 01:35 PM
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Registered
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I'm not following the comments, so I'll just post some pictures.
Oxygen Sensor:  In the top pic, the black arrow points to the CHT sensor connector. 
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10-07-2010, 01:38 PM
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Registered
Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
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Quote:
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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10-07-2010, 01:44 PM
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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
Posts: 935
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Thx Rusnak - mine looks quite different than that picture - I think it's all conglomerated into one circular 3-wire connector. And 86 - correct - I do not have a relay there...
JB
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'86 Carrera Cabriolet '73 911T Sporto (RIP) '90 Miata LeMons Contender! '71 Datsun 510 (RIP) '67 Fiat 124 Sedan (RIP) '72 Ford Pinto (RIP) '62 Plymouth Valiant '60 Ford Galaxy 500 (RIP) |
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10-07-2010, 02:40 PM
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