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-   -   Need help with o2 sensor (

choard 09-30-2012 12:31 PM

Need help with o2 sensor
I have a 2008 Subaru Legacy 2.5i. It threw a code the other day. Forgot the number, but it was one of two problems. o2 senor or catylic convertor. I want to start at the o2 sensor. I know there are 2 sensors on the car, upstream and downstream. How can I go about figuring out which sensor has the problem?

Osei 09-30-2012 05:30 PM

Probably 0420.
More often than not it is the O2 sensor.
Bank one sensor 1 is up, sensor 2 is down.
Denso or Bosch.


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