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Many things contribute to codes setting and even not setting. There can be current codes that are active but do not set the MIL light since they haven't met enough criteria. Its also possible that the previous owner converted to obd1.

As others have said, the cause of the plug differences is the broken bolt. Fuel trims tell the tale. You can test your o2 sensors on the vehicle with a scanner. Will a scanner get data if it is hooked up? Lets start there.

Chris
 
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