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02 Subaru Outback Sport obd2 codes


Casper

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P0328

Knock Sensor 1

Circuit High Input

Bank 1 or 1 Sensor

 

P0420

Catalyst Efficiency

Below Threshold

Bank 1

 

This is a guy at work's car. He's noticed a serious drop in fuel mileage and now these codes are popping up. I'm not sure what these are. Never dealt with knock sensors. The car only has like 80k on it, so I don't see the cat going bad already. Seems more logical that there's a problem with the knock sensor which is putting the computer into some type of safety fuel map. I'm probably way off, but that's my theory. I don't know shit about these cars. Any help is much appreciated.

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I think the car has been running rich because of the knock sensor going bad and now the cat is getting plugged, the cat is under waranty I believe, but the knock sensor is not.

 

Usually the cat's are only covered under warrenty for the first ~80k miles. Put yeah, at the least you have a bad convertor. Knock sensors can get set off unintentionally on some vehicles.

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