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Check engine light

JohnKos
in Old Gen.: 80's GL/DL/XT/Loyales...

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Light came on so i went to Autozone for a reading. Code came back P0420, catalyst efficiency below threshold - bank 1

 

possible causes:

 

1. rich a/f ratio

2. ignition system malfunction

3. faulty catalytic converter.

 

Is there anything i can check or do before i take it to the shop for their opinion?

  • Author

Crap, put this in older cars instead of newer. It's a 1997 legacy. i'll repost it there.

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