Mystery Plug found under hood

ECU, Wiring, Sensors
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Mystery Plug found under hood

By KidKRYLON
- Wed Oct 29, 2014 9:30 pm #349495 Theres a random unplugged plug under my intake that I have no idea where it goes. It has a green wire, Yellow wire, black wire, and a white wire going to it but the only thing that doesn't work on my car is the horn... Any ideas if this is the horn wires or something else?
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By KidKRYLON
- Thu Oct 30, 2014 12:33 pm #349508 93 cx with a 97 y8

By HeikDiesel
- Thu Oct 30, 2014 1:49 pm #349517 My guess is IAT but I'd have to look at the schematic
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By teal_dx
- Thu Oct 30, 2014 3:36 pm #349521 What engine harness are you using? If it's the OBD2 harness it may be for the secondary o2 sensor. IAT is 2 or 3 wires. o2 sensor is the only thing I can think of with 4 wires that might be that color.
A pic would be a big help :thumb:

By HeikDiesel
- Thu Oct 30, 2014 6:41 pm #349526 It's usually not G,Y,Bk,W is it?
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By KidKRYLON
- Wed Nov 05, 2014 7:52 am #349628 It's a secondary o2 sensor. Looked at a buddies EL. Is there any use to it tuning wise or should I just tape it off? I'm OBD1 not OBD2.
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