What is the cause of the P2A00 fault code in the Infiniti G37s?

1 Answers
DiCamille
07/30/25 3:26am
P2A00 fault code, applicable to all car manufacturers, means oxygen sensor circuit range/performance. The function of the oxygen sensor is to measure the oxygen content in the engine exhaust to correct the fuel injection amount, so that the engine can obtain the optimal air-fuel ratio. Extension: In OBD fault codes, you will often see references to which row and which oxygen sensor. Row 1 refers to the row where cylinder 1 is located, and the remaining row is Row 2. Regardless of the row, the first sensor always refers to the upstream oxygen sensor (before the catalytic converter), and the second sensor always refers to the downstream oxygen sensor (after the catalytic converter).
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