Ford F150 (1997-2004) Fuse Diagram • FuseCheck.com (2024)

FAQs

Where is the o2 sensor fuse on a 2004 Ford f150? ›

On the 2004 Ford Truck F-150 Heritage Pickup with the V6-4.2L engine, the fuse for the oxygen sensors is located in the under-hood fuse block. The fuse is # F1. 23. This is a 15amp fuse.

Engine fuse boxes are typically situated near the battery. In this vehicle, the battery is on the driver's side, and there is a fuse box right above it with a black plastic cover to protect the fuses. On the passenger side, there is also a battery, and the fuse box is located nearby.

Remove the fuse from its holder. In some cases you may need a small screwdriver to unscrew the fuse holder cap. Look at the fuse wire. If there is a visible gap in the wire or a dark or metallic smear inside the glass then the fuse is blown and needs to be replaced.

To answer your question, there is no fuse for the coolant temperature sensor, it is connected directly to the vehicle ECM. The ECM supplies a supply voltage on one wire, and the other wire is the signal wire returning to the ECM .

Four-cylinder engines have two sensors, while V6 and V8 engines have four sensors. The upstream oxygen sensor(s) are located below the exhaust manifold flanges and above the catalytic converter. The downstream oxygen sensor(s) are located in the exhaust pipe, behind the catalytic converter.

Sometimes a fuse is bad but not necessarily blown. In this case, the best way to test it is with a test light or a multimeter. These are both relatively inexpensive tools and provide an easy way of checking if there's a current running through the fuse.

Testing Switch Pin Continuity

The switch pins on a Normally Open (NO) circuit should have no continuity when not energized. Use a multimeter on the ohms setting to measure resistance between the switch pins. Any resistance indicates the pins are stuck closed, signaling a faulty relay.

You can tell a fuse is blown if the glass container holding the fuse in your fuse box is cracked or broken. Non-visual signs of a blown fuse include short circuits, ground faults, damaged outlets or electrical wires, and an overloaded circuit.

A switched fuse is one that only has power when the ignition is turned on, while a constant fuse always has power.

Usually, it will be in your garage or your basem*nt. Open the fuse box and look at the glass containers that hold the fuses. If you can see that the fuse is visibly broken, or there is metallic residue on the glass from the fuse blowing, you will need to replace that particular fuse.

Where is my main fuse? ›

The first thing to do is find your main fuse box (these days called a consumer unit), which will be in the same place as your electricity meter. They're often in the main hallway of a house, in a purpose-built cupboard.

The fuse box is also an electrical distribution board, like the switchboard. The difference is that while the switchboard distributes electrical power around the house, the fuse box protects circuits from overloading. That's why fuse boxes are sometimes referred to as “circuit breakers”.