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The oxygen sensor in your 2001 Toyota Tundra may one day go bad and need replacement. The oxygen (O2) sensor is responsible for regulating the oxygen and fuel ratio in your vehicle, contributing to the efficiency of gas usage. If the oxygen sensor goes bad, your Tundra may run poorly and get poor gas mileage. Knowing how to replace it yourself can save you money.

Instructions

Instructions

1

Locate the oxygen sensor on the pre-catalytic converter. This is located near the right-front wheel well of your Tundra.

2

Detach the large air intake pipe that is connected to the air box going to the rear turbo. Also remove the two smaller air pipes connected to the air box running to the blow off. This will give you access to reach the sensor. Soak the oxygen sensor in penetrating oil (WD-40 or similar) to loosen it for easier removal.

3

Use the 7/8-inch wrench to remove the old oxygen sensor. Find the stock sensor wire near the engine lift loop by the firewall. Splice the stock sensor wire and connect it with the wires to the new oxygen sensor using crimp connectors.

4

Apply some of the anti-seize paste to the threads of the new sensor. Be caul not to get any of the paste on the sensor itself or it will ruin it. This will make the oxygen sensor easier to remove the next time.

5

Screw the new sensor in by hand. Fully tighten it with the wrench so it can not be loosened by hand. Reattach the air pipes again.

The 2004 Toyota Tundra has had a number of recalls. One such recall is for the Tundra marker lights. A marker light is a blinking light that is produced to indicate the direction the driver is taking; its also known as a turn signal or indicator light. If your Tundras marker lights are constantly blinking, you may have a faulty blinker fuse or light bulb.

Instructions

1

Insert the key into the ignition and turn it clockwise to the "On" position, but do not start the engine.

2

Test the blinker system by inspecting the fuse panel. Look under the cars dashboard, which is located just below the drivers knee. Youll see the fuse box. Locate the tap on the fuse box cover and lift it up to snap the cover off. Remove the cover. On the underside of the cover is a chart that explains each fuse control.

3

Inspect the blinker flasher. Connect a jumper wire to two slots at the top of the fuse panel. Switch the blinker lever to the "Off" position. If the blinkers are still going, you may have a faulty fuse that will need to be replaced.

4

Turn off the Tundra and remove the key. Remove the marker light covers and replace the bulbs. Unscrew the cover and twist off the bulb. Insert another bulb into the housing and screw it in tightly. Insert the key into the ignition. If the lights continue to blink, youll have to turn to a mechanic to repair the fuse box.