15 STi P0073

[CSF707]

I threw this code right after installing Hella horns lol, I did notice two different connectors by the horn. I used one to plug into the grimmspeed harness to plug into the two horns. This second connector I noticed was just plugged into this dead end.

I'm begining to think its some sort of temp sensor now that ive removed? Thoughts?

I no longer see the outside temp displayed on my top display and cruise light flashing and CEL is on.

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**FIXED ISSUE**

 

[Raven32]

P0073 is ambient air temp sensor.

More information here
https://www.yourmechanic.com/articl...re-sensor-circuit-high-input-by-jamahl-walker

Additionally did you unplug anything else when installing the horns?

Also pics of how you hooked everything up would help also.


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[CSF707]

Only the two plugs where the horn connects to and the other plug that plugs what appears to be a dead end clip. I reused this to plug the hella horns plus keeping the stock which I probably shouldn't have. I've tested all 3 horns individually and all work as plugged in.

Hard to explain but the original horn harness in the center has two cables but is only plugged into 1 horn as I don't see any other one in the center area. After watching some videos, there appears to be a second horn hiding under the left side section under the passenger headlight.

I will need to rip the bumper off again in order to take those pics as I had no issues doing everything while the car was off to test the horns.

I'll post the pics I have soon, I got work tomorrow.

 

[CSF707]

If you see that one wire dangling on the bottom there, thats 1 of 2 connected on the same wrapped stock harness. I used that wire to be plugged into the grimmspeed harness which plugs into both horns. Reused the second into the stock horn(Which I may need to revert and plug back into this dead end plug)

 

[CSF707]

Fixed it!

Put back this plastic piece(far right) back where it belongs as it's apparently a ambient temperature sensor
On top of that I also crossed the wiring, I used the short to the stock horn and the long part to the hella horns grimmspeed harness. Didn't think that small thing was anything special but boy was I wrong! lol
Sad part is, both of them are the same exact plug for the stock horn and sensor. **So just make sure you use the stock horn plug(short side) for the hella horns and long part stays with the sensor**

This is what it looks like up close

Connected the right way this time

And so I ended up deleting the horn(weight reduction right?:lol but keeping the bracket in place for the sensor.

View from the stock horn harness to the Grimspeed wiring harness

And from above (Hella horn pins were bent downward due to the back side of the wires touching the radiator)

Inside cabin before pic (Missing temp on the top left of the middle display, also cruise light will be flashing and SI-Drive is disabled and will also be flashing in S mode. CEL will also be on)
Car feels like its in crippled mode and HVAC will be slightly out of wack when trying to blow hot air.

After putting back the sensor, you will see the temp back on the display

Used this tool to read my code and clear code after fixing my issue using the torque app