This interface board is for 1996 and later Subaru OBDII engines to eliminate seven common fault codes: fuel tank sensor signal, fuel tank pressure valve, fuel tank drain valve, fuel tank pressure solenoid valve, fan relay #1 & #2, fuel temperature, and fuel level.
Some codes may still be present but none of those are the cause of runability issues. If it is ordered with our harness modification kit, the instructions there have a pinout specific to your year and model. If you order this as a standalone you do not get instructions.
Now with built-in LED for check engine light!