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Q: check engine light on;codePO138 set on 2001 Chevrolet Monte Carlo

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
replaced:O2 sensors,spark plugs,wires,intake manifold gasket and head gasket inless than a month;code returns & light comes back on. what now?
(1) Answer
i hope this was not for that code. a lot of replacing.
138 indicates rich condition. could be a fuel pressure regulator, mass air flow or coolant sensor.
i think you may need a second opinion from a shop to track it down and help you.

Roy