replaced:O2 sensors,spark plugs,wires,intake manifold gasket and head gasket inless than a month;code returns & light comes back on. what now?
Chevrolet Q&AAsk Your Question
2001 Chevrolet Monte Carlo Question: check engine light on;codePO138 set
Answer #1mastertech6371 December 21, 2010, 19:14Master
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.