oxygen sensors

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=94285
Printed Date: May 11, 2025 at 10:49 PM

Topic: oxygen sensors

Posted By: semperfiguy98
Subject: oxygen sensors
Date Posted: May 27, 2007 at 3:50 PM

Trying to figure something out here. My car has a check engine light "Catalyst inefficiency". I was wondering if there is an inexpensive way to create an O2 sensor simulator using radio shack parts. Here's what I know so far. The upstream sensors should show between 0.1 and 0.9 volts depending on A/F ratio. The downstream sensors should show around 0.45 volts fluctuating slightly between .4 and .5 volts. How can I create something that produces an artificial signal to my ECM showing ~.45 volts? Any help would be appreciated.

Replies:

Posted By: ringojam
Date Posted: May 27, 2007 at 7:43 PM

They sell them on e bay 02 simulators.

-------------
Jamaica home of the worlds fastest man.

Posted By: semperfiguy98
Date Posted: May 27, 2007 at 10:05 PM

Quote-

Semperfiguy98 - "I was wondering if there is an inexpensive way to create an O2 sensor simulator using radio shack parts."

It's not as much fun buying something as it is creating it...

Posted By: KPierson
Date Posted: May 27, 2007 at 11:14 PM

I beleve they send a pulse signal. The longer the pulse the higher the voltage. You can simulate them with a 555 timer and a few parts.

Here's a link I found through google:

https://www.mkiv.com/techarticles/oxygen_sensor_simulator/

-------------
Kevin Pierson