Is there a fuse for the air fuel sensor?

Yes, there is usually a fuse for the air fuel sensor. The fuse is typically located in the engine compartment fuse box. The fuse rating will vary depending on the make and model of the vehicle, but it is typically between 10 and 20 amps. If the air fuel sensor fuse blows, it will prevent the sensor from receiving power and it will not be able to function properly. This can cause the engine to run rich or lean, which can lead to poor performance and increased emissions.