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You need a diagnostic computer to clear the codes. A po400 refers to a leak in the fuel vapor system. Clearing the code without repairing the problem will do no good as the light will come back on.
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What does the codes po400 and po440 mean for a 96 Nissan maxima and how do you fix this problems does AutoZone have a machine to read these codes for free?
Code P0400 means EGR insufficient or excessive flow detected Code P0440 means Evap system leak
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