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DTC P0420

A few years ago, on my aging 2001 Subaru Impreza 2.5 RS, I got a check engine light. With the Actron CP9175 OBD II AutoScanner, I pulled the following code:

P0420
Catalyst Efficiency
Below Threshold 
(Bank 1)

I cleared it back then, and it comes back once in a while. But early this month, it started coming back all the time after clearing it. Looks like whatever worn out has finally failed. What could it be?

Chieh Cheng
Fri, 26 Mar 2010 21:31:49 +0000

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