Ok so my eg si was a gsr turbo precision t4 kit , now its all motor with a gsr ecu and obd1 to obd2 harness, i got check engine light for the o2 sensor cuz theres no where to connect it , anyway i was wondering is there anyway i can hook up the code reader on it just incase i need to scan for code # ? thanks

 

reading OBD1 codes has been documented multiple times. search the forums, or google.