nvr-enuf

For my issue, i replaced the rear O2 sensor and no more check engine light! Yeah!

Ok - rear sensor installed, I will get the code cleared and see if this fixes the code. Thanks

So do i spend $60 on a rear O2 sensor or a spacer on the rear which would solve the problem "if" the cat is not doing it's job? A univeral CAT is $70. Is there a way I can test the rear O2 sensor?

Really? everyone seemed to state that the lead O2 sensor is the one that typically goes. Are you saying it is the one after the cat due to the code from the Scan gauge or based on your experience?

 

If downstream, where would I get the spark plug fowling fitting that everyone talks about?

I did a search on the dreaded P0420 code so I do know that likely my front O2 sensor could be bad / or I could put a spacer in the rear.

 

The Vag-Com states "P0420 - Catalyst System; Bank 1: Efficiency Below Threshold". Does this tell me which sensor that the car is having issues with which could narrow down my problem?

 

Thanks everyone - I want to fix the problem since we are selling the 2002 subie outback sedan, been a great car but wife needs a mini van. She still wished that Subie made a mini van.