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Trouble code P0172 indicates that the engine control module has detected a rich fuel condition in bank 1. To fix this issue, start by checking the fuel system for leaks, inspecting the fuel injectors, and ensuring the fuel pressure is within specifications. Also, examine the mass airflow sensor (MAF) and the oxygen sensors for proper operation, as they can influence the air-fuel mixture. If needed, replace any faulty components and clear the trouble codes to see if the problem reoccurs.
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