2004 Nissan Pathfinder w check engine codes P2122,2138

Hello 2004 Nissan Pathfinder failed to accelerate, on a green light, engine codes were P2122, P2138, V1001. Towed it to the mechanic. By the time the tow truck arrived the car was running. The mechanic checking everything after several test drives, released it. He didn't want to change any parts because it was running normally. Any ideas? Please help.

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