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1997 Honda Civic Question: Why is the monitors reseting to zero after key is turned off?

 

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spheremkr, 1.6L 4 Cylinder, Sun City, CA, May 02, 2012, 15:39
 Rookie

Replaced O2 sensor and air filter box. Re- smoged car after repairs-passed. Customer took to Test only station
failed three incomplete moitors. O2 Cat. and Evap. When I
tested monitors passed. Cust took to T.O. Station turned car off then failed on monitors. Why?

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