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What is the P0138 engine code for a 2002 Infiniti G20?

P0138 is a diagnostic trouble code (DTC) that indicates an oxygen sensor circuit malfunction for bank 1 sensor 2 on the 2002 Infiniti G20. This code is triggered when the oxygen sensor fails to properly monitor the oxygen levels in the exhaust gases, resulting in incorrect air-fuel ratios and potentially impacting the vehicle's performance and emissions.
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