1994 FZJWhat year is your truck?
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1994 FZJWhat year is your truck?
Thanks, so it's OBD1.1994 FZJ
If the CEL is always on and the exhaust smells bad, you're overfueling all the time.
This is why they install the diode or whatever in the O2 sensor harness to fool the ECU into thinking everything is normal. This will improve the gas mileage a bit and should help some with the fuel smell exhaust.
If you like throwing codes, running rich and smelling like a janky old lawnmower, that's your prerogative.
I personally wouldn't do anything to deliberately worsen the air quality where I live, and I hope most of my neighbors feel the same way.