This article describes how to replace the upstream O2 sensor which eliminated the p0133 p0134 error codes.

I was getting a check engine light with error code p0133 and p0134 in the 2004 Toyota Corolla CE with manual transmission. This description also applies to 2003, 2005, 2006, 2007, and 2008 Toyota Corolla’s.

What Causes a p0133 and p0134 Error Code?

It turns out that these error codes refer to the upstream oxygen (o2) sensor not responding and replacing the faulty o2 sensor will fix the problem.

Tools and supplies needed:

Steps to Fix P0133 and P0134 Error Codes

First, locate the upstream o2 sensor. Open the hood, it is near the back against the firewall.

Remove the O2 sensor.

Use a flat screwdriver to pull up the tab and unplug it.

Had to remove the heat baffle (4 bolts 12 mm) to get at the place to unscrew the old sensor.

Initially, I took out the old one and sprayed it with throttle body cleaner, sanded off the roughness, and reinstalled. I reset the error code, and hoped this would solve the problem, but unfortunately it came back the next day.

So bought a new one and replaced it. This is the o2 sensor replaced that fixed the problem.

Error code stays off now.

I’ve had this one in for well over a year now. These error codes have not returned.

Thanks for reading, and I hope someone out there finds this helpful!


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Sensor used in this article:


Denso o2 Sensor from Amazon