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2003 Honda Civic Question: I've scanned the above car and got a trouble code P1166.

 

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koo, 1.7L 4 Cylinder, Hanover, VA, May 29, 2013, 10:16
 Rookie

I've changed the HO1S and HO2S but the light was still on. I've then changed the exhaust gas completely but the light still remained. Can you please advise about what may cause this?

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