Codes P0171 and P0174 indicate that the engine is running lean on both the bank 1 and bank 2 sides, respectively. Common causes include a vacuum leak, such as a cracked or disconnected hose, a dirty or failing mass air flow (MAF) sensor, or issues with the fuel system, such as a clogged fuel filter or weak fuel pump. Additionally, problems with the oxygen sensors can also lead to these codes. It's important to diagnose the specific cause to ensure proper repairs are made.
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