How to Reset the Computer on a Nissan Sentra

by Don Bowman

When the check engine light illuminates on the dash in a Nissan Sentra, it is an indication that the computer has recognized a problem within its sphere of influence. Once the problem has been addressed and corrective action completed, the computer can be reset by erasing the existing codes.

Step 1

Insert the code scanner's connector into the OBD port located under the dash to the right of the steering column.

Step 2

Turn the ignition key to the run position. Make sure the engine is off.

Step 3

Press the button for "Read" on the code scanner. Within less than 1 minute, the scanner will display all failure codes that are stored in its memory.

Step 4

Write down the failure codes displayed by the scanner. Cross-reference the codes with the code sheet that comes with the scanner. The codes are displayed with a letter followed by a four-digit number code. Deciphering these codes by cross-referencing them with the code sheet offers an explanation of the failure.

Step 5

Turn the key off. Correct the failure so that the computer can be reset.

Step 6

Turn the ignition key on, keeping the engine off. Press the "Erase" button on the scanner. Start the vehicle and allow it to run for 5 minutes. Watch for the check engine light to come back on. If it does, the problem has not been corrected. If it stays off, the problem has been successfully resolved.

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