SOURCE: fuel ratio sensor replacement
The air/fuel ratio sensor is just a four wire (pre-heated) O2 sensor. It is right in front of your O2 sensor and can be replaced with only a wrench. The cheapest i found it was for $186 at partsgeek.com and i hear that at the dealer it costs $255.
i hope this is helpful
-matthew
SOURCE: Check engine light
Sometimes can be prematurely dirty air filter, sets off the air flow sensor, which sets off the o2 sensor. So might try new air filter first and erase codes and then see, before you spend more bucks than you need; then if codes return, do the flow mix sensor.
SOURCE: i have a honda 2002
in the fuse box, it may be marked, or in your owners manual. Chefk them all, then you will know if any fuses are bad. Usually its the sensor if the fuses are good.
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