AK_92_V8

I just fund out that my o2 fuse is blown out. It takes a 10 fuse but all I have is a 20 and a 30 can I use a 30 or 20?

Kneale Brownson

The fuse is sized to the size wire it serves. You take a chance on burning the wire by installing a higher amperage fuse. Figure out why it blew instead and then use a properly sized fuse.

Blue44

I'd like to add too that it's not only wiring that you can alter/melt if you use a higher amp fuse. What about solid state electronics? For the $.99 it costs for a few 10 amp fuses it's well worth not burning up your engine computer or something similiar which costs much more $$$ and probably easy a day or two of diagnosis and parts locating.

AK_92_V8

ok then i will just keep replacing the fuses. I don't know why it blows fuses. I have no idea how to tell.

Blue44

When fuses blow it always means there is more electrical current running through the circuit. This is usually caused by a grounded out positive wire or an intermitently grounded out positive wire. Often a wire has the rubber coating shaved off somewhere and exposes the wire to the body of the car. The body is always connected to ground/neg - battery terminal. When the car is driven wires bounce and touch stuff (in this example the body of the car).

This could also be corrosion in an electrical connector causing more resistance and in turn more amperage in that particular circuit.

It could be many things. I would start to look around the wiring which corresponds to that fuse circuit; what ever that fuse circuit is labeled as. Check electrical connections for corrosion or water in this particular wiring system. If it's O2 "something or other" I would check the engine control unit connection for sure.

Hope this helps, best of luck,

Alex