I have a 2009 Honda accord 3.5. It has about 130k miles on it and I don't think the oxygen sensors have ever been changed. I got a quote from the local dealer for the following parts 36531-r70-A02 , 36541-R70-A02 , 36532-R70-A02 and 36542-R70-A01 . I see to sensors in the engine compartment from above and one post cat. I cannot seem to locate any info as to the specific installation location of the 4 different sensors .

 

You don't necessarily need to change the air fuel ratio sensors and oxygen sensors if you don't have any issues.

The locations are shown in the parts diagram:




Most of the time, the Honda OE supplier for the air fuel ratio sensors and oxygen sensors are Denso. You can purchase Denso outside the dealer for much less.

These are the Denso part numbers depending on your model. Many retailers sell them, including Amazon.

 

if you don't cell check engine lights or issues, why r u changing?

 

The car has 130k miles on it and they had never been changed

 

Unless you get a code, leave them alone. You can buy them and keep in the garage but i don't see the need to replace them if they're working fine