The car did not have code P0420. Replaced catalytic converter on this unit. The code came in 200 miles. Replaced the lower cat. The code came back after 200 miles. Now I can no longer return the item. I have to buy a California emissions cat, even though the car is state-issued. Yes, I know how to diagnose a car. I have 15 years experience as a Subaru mechanic. I was just trying to save money and I bought Walker because it's a well known brand.
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