Author Topic: O2 sensors  (Read 191 times)

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Online Ch

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O2 sensors
on: June 09, 2020, 07:47:48 PM
does anyone know why has 2 oxygen sensors on the exhaust? I am looking for a dyno auto tune and i am trying to understand how it works.

Anyone experience with tuning?

Offline rcb78

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Re: O2 sensors
Reply #1 on: June 09, 2020, 09:04:18 PM
It's an emissions thing, one before and one after the Cat.  This allows the ECU to monitor that the Cat is functioning properly by comparing readings on both sides.  It also helps prevent people from doing Cat delete exhausts because the ECU will know if it's missing now.

Online Ch

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Re: O2 sensors
Reply #2 on: June 09, 2020, 09:28:09 PM
Thanks for your reactions. I know that they are both oxygen sensors and what an o2 sensor is made for. I think it is not after the cat, it is just on the pipe bith of them.

Offline rcb78

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Re: O2 sensors
Reply #3 on: June 10, 2020, 07:48:39 AM
Take a closer look, one is before the Cat and one is after.  Maybe I don't understand your question, but your tuner should know what to do with two O2 sensors, this is pretty common in newer engines.

 


strongminded