2002 Sport blows emission fuse

[Tom M]

2002 Explorer Sport, auto, w/65K miles keeps blowing the 15amp fuse that controls the emission control devices (O2 sensor, MAF sensor, EGR valve, etc.) vehicle ran perfectly fine until first fuse popped. Now, it blows them one right after the other. Would like to avoid trial and errorif possible as the money spent starts to pile up fast. Any ideas?

 

[BrooklynBay]

Welcome to this forum! Do you have a wiring diagram? You could check everything that is on the same circuit to analyze where the fault might be. Check Autozone's website for a schematic.

 

[dogfriend]

^^^ What BB said. You need to find a schematic of that circuit and then unplug all of the sensors that are powered by that circuit. If the circuit is blowing before the engine starts (key on engine off), this will be easier to diagnose. If it only blows when the engine is running, you will probably need the MAF plugged in, but you should be able to start with all other sensors unplugged. Again, just start plugging in one at a time until the fuse blows.