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Service engine soon codes for a Nissan Altima can indicate various issues, ranging from minor problems to more significant concerns. Common codes include P0420 (catalytic converter efficiency), P0300 (random/multiple cylinder misfire), and P0171 (system too lean). To diagnose the issue, it's essential to use an OBD-II scanner to read the specific trouble codes and then investigate the underlying causes. Regular maintenance and timely attention to these codes can help prevent more severe engine problems.

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