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Thread: Fuse 18 Keeps Blowing Reply to Thread
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Topic Review (Newest First)
10-03-2012 03:17 PM
flaurencelle Unless you want your car on fire on the Highway, never replace a Fuse with a higher rated fuse. The Fuse is there to protect the wire from acting like a fuse and burn!

Trust me on this!
10-01-2012 08:13 PM
Telly Did you ever find the problem? I'having the same problem, F18 blowing as soon as I turn on the key, with the O2 unplugged. I'm getting 4 ohms on the terminal coming out of the fuse panel. The wire looks like it runs back into the cab before coming back out to the O2 heater.
07-04-2008 11:36 PM
nickl16 your back one is probably dead as well, both of mine went at the same time and were causing the fuse to blow
07-04-2008 03:47 PM
bwcall I replaced the front sensor (it was a Bosch) with a Motorcraft part today, and the fuse still blows after turning the car off and back on once (still drives fine, however). So I guess it's off to the dealership.
07-04-2008 01:40 PM
RecoilRob The forward O2 sensor is really close to the tranny and it doesn't take much of a hit on the pipe to jam it with resulting damage.

More than likely, it has hit and hurt the wiring on the sensor. Replacement will cure it but make sure the pipe is down where it belongs so the new one won't get ganked.
07-04-2008 01:26 PM
Grich171 if you have a high flow cat or no cat that could throw a CEL on...i would try and get a wiring diagram of the circuit with that fuse in it and see whats goin on and check the wires
07-03-2008 06:45 PM
pat247 First thing I would do is a visual inspection of the wires under the car that plug into the O2 sensor. Look for damaged or burnt spots, if the wires look good then replace the O2 sensor and if the 10A fuse still blows then take it to an authorised dealer.
07-03-2008 06:21 PM
InfraRedSVTF Most likely the heater circuit in the o2 sensor shorted out. Get a new o2, and replace the fuse with one of the proper rating.
07-03-2008 05:47 PM
BlueFocusSVT04 Take it in for service to an authorized Ford SVT dealer. They will probably charge a lot, but they will help you.
07-03-2008 03:28 PM
focusguy87 You could hook up a meter and see what its doing exactly. Guess ford would do that anyway.
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