I have a 1990 civic si automatic and I'm having a couple of issues:

1. my rear defog is not working (I have replaced the relay and the switch)
2. my marker lights and taillights work intermitently ( I think its the day time running lights relay)
3. I have a O2 sensor fault ( I have replaced the 02 sensor and a broken part of the wire, I have continuity from the computer to the plug for the O2 sensor and I have disconnected the battery to reset the code faults but it still comes back)

I'm now starting to wonder if this all might be related to a bad computer? Please help!!!!

If anybody know what computers (ECU) are compatible with my car can you please let me know.