How to Replace an Oxygen Sensor on a Toyota Tundra

The oxygen sensors in your Toyota Tundra monitor the oxygen levels in the exhaust, thus helping regulate your truck's fuel consumption. If your gas mileage has decreased or your "check engine" light is on, the oxygen sensors may be the cause.

If you have a singe exhaust, your Toyota Tundra will have two sensors; if you have dual exhaust, your truck will have four sensors. Buy replacement oxygen sensors from an auto parts retailer or Toyota dealership.

Difficulty:

Easy

Instructions

things you'll need:

• Oxygen sensor socket
• Ratchet
• Box-end wrench set

1. • 1

     Disconnect the negative battery cable with a wrench and secure the cable away from the battery.

   • 2

     Locate the faulty oxygen sensor. There will be one sensor located in front of the catalytic converter and one located behind the catalytic converter, on the exhaust pipes. If your Tundra is equipped with dual exhaust, you will have four oxygen sensors, two on each pipe.

   • 3

     Remove the wiring harness from the oxygen sensor. The harness will simply unplug from the sensor, pulling free.

   • 4

     Remove the oxygen sensor from the truck. Your approach will depend on which Tundra engine you have: You can use an oxygen sensor socket and ratchet to unthread the sensor or a box-end wrench to remove the mounting nuts and pull it free of the exhaust.

   • 5

     Install the new oxygen sensor and tighten it with an oxygen sensor socket and ratchet--or replace the mounting nuts and tighten them with a box-end wrench, depending on your specific Tundra.

   • 6

     Press the wiring harness connector into the connection on the oxygen sensor socket. Repeat this process for the remaining sensors if you are replacing them all.