The Ultimate Toyota Oxygen Sensor Buyer's Guide

Your exhaust system has up to four oxygen sensors. They are tube-shaped sensors that measure the amount of oxygen in the exhaust gases.

This buyer’s guide will teach you everything you need to know about Toyota oxygen sensors, what to do if one of your oxygen sensors fails, and more.

O2 sensor

What's An Oxygen Sensor, and Why Is It Important?

An oxygen sensor is a small sensor mounted in the exhaust system. It registers the amount of oxygen in the exhaust fumes up to seven times per second and relays the information to the ECU. The ECU then adjusts the air/fuel mixture to ensure that the engine performs optimally. The oxygen sensor is an important part of your engine. If it fails, your ECU will get no feedback on your engine’s emissions, and may end up reducing your engine's performance. Read more about oxygen sensors and how they work here.

How to Diagnose a Failing Oxygen Sensor

It’s not uncommon for an oxygen sensor to fail. Typical symptoms include a rough idle, sluggish acceleration, and the engine running hotter than normal. Even if you’re experiencing all of the symptoms, it’s still a good idea to officially confirm that your oxygen sensor is broken before replacing it. The way to do this is to test all of your oxygen sensors with a digital voltmeter. This comprehensive tutorial covers all the steps of the diagnostic process.

Are OEM Oxygen Sensors Better Than Aftermarket?

Are you on the fence between buying an OEM oxygen sensor or an aftermarket oxygen sensor? This comparison guide should help you reach a decision. In a nutshell, OEM is the safer bet.

How to Replace Your Toyota's Oxygen Sensor

Replacing the oxygen sensor in your Toyota is quite an easy process. It only requires a 22-millimeter wrench and anti-seize lubricant. This tutorial covers all the steps to replace your oxygen sensor safely and efficiently.

Written by Jason Lancaster