Originally Posted by Yell88CRXsi

Code 2 is the (O2B) Oxygen sensor. You either have:
- a unplugged O2 sensor.
- a broken wire from the O2 sensor B to the pin C8 on the ECU C plug.
- a unshielded wire that is picking up EMP from another wire. (very common in getto swaps)
- a bad O2 sensor.
- or a O2 sensor that is not in the factory location and not reading in the proper heat range. Remember that the JDM OBD0 ECU's needed 2 (two...meaning 1 + 1) O2 sensors that are reading cylinders 1 & 4 and 2 & 3.

Hope this helps.