plugged air filter? sounds silly but ive seen it throw rich codes on obd2. too much fuel not enough air.
did you reset the ecu after fixing the coolant wiring? i always pull the 7.5 amp fuse (in the underhood fuse block) for 10 seconds after making any changes or fixing somthing on my hondas. especially if the engine light was on.
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Burn lean and prosper \\ //
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