OBD port/ fuse box

2000 Ford Expedition 224000 miles
The fuse that goes into the slot that connects the OBD port and cigarette lighter keeps popping. How do I fix this? I can’t pass a smog. Do I need to replace the whole box? The vehicle runs good nevertheless
Fuse from United States 3 years ago  
FU
3 reports 
Jay c from United States 3 years ago
Could be the relay that is going bad. usually if the relay is bad or faulty it will pop the fuse constantly.
MIKE from United States 2 years ago
My truck does the same tthing... Y
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