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

replaced:O2 sensors,spark plugs,wires,intake manifold gasket and head gasket inless than a month;code returns & light comes back on. what now?

by in Franklin, VA on December 20, 2010
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1 answer
ANSWER by , December 21, 2010
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