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Have codes p0420 and p1399

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I have po420 p1399 code on 2000 honda crv just added oil then started acting like loosing power when go what can I do

Vehicle: 2000 honda crv

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P0420 Catalytic efficiency below threshold Bank1

P1399 Random misfire

Check the engine oil level. if there is a overfilled engine oil you can set this code .

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