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So to help with the Sunload sensor...has the dash ever been out of the car, say for replacement or some sort of repair? If so it is very possible the sunload sensor was unplugged and never plugged back in. That is where I would start first.
To help with the key reprogramming...I have yet to find a locksmith that can program a new key to work with the immobilizer, they can only program the lock/unlock features to the fob. That can only be done with the Subaru Select Monitor-SSM (Dealer scan tool). The Techstream WILL NOT program keys on BRZ's and the Subaru Select Monitor (SSM) WILL NOT program keys on a FR-S/86.
Techstream can be used to pull codes, read some data, etc on the BRZ, but isn't as thorough as what the SSM can do. I use the ECUtek reader more often than the Techstream...and then the SSM for everything else.
If a Subaru dealer is using the SSM and telling you they cannot access the ECU it is likely 1 of 2 things:
1: The ECUtek flash is disrupting the connection
2: The OBD2 port in the car is flakey (easy fix is to use a cheap OBD2 extension cable between the device and the OBD2 port. I bought a cheap one from Amazon to "fix" this issue on my BRZ.
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2020 GMC Canyon Denali Duramax, 2021 Forester Sport, 2000 Subaru Legacy B4 RSK 5MT (JDM Import) and random 86 chassis rebuilds....
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