Malfunction Indicator Lamp (MIL): Design/Purpose
WARNING: This page is about a different car, the 2019 Nissan NV3500 HD and 2019 Nissan NV2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
When a malfunction which increases exhaust gases is detected, ECM turns ON MIL and informs the driver of the necessity of inspection and repair.
When a malfunction which causes damage to the catalyst is detected, ECM immediately blinks MIL to alert the driver.
 Courtesy of NISSAN NORTH AMERICA, INC.
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