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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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∙ 15y ago

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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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What is code po400?

Code P0400 is an OBD-II trouble code that indicates a malfunction in the EGR (Exhaust Gas Recirculation) system. This code typically means that the EGR flow is insufficient, which can lead to increased emissions and poor engine performance. Common causes include a clogged EGR valve, a faulty EGR sensor, or issues with the vacuum lines. It's important to diagnose and repair the underlying issue to ensure the vehicle operates efficiently and complies with emissions regulations.


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