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replaced the upstream Oxygen sensor drove it for a hour then the engine light came back on with the VTM coming on periodically. I also have a P0128 that Autozone machine detected. What could be the problem?
 

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VTM light will come on when the engine has DTCs that may indicate reduced power output. It means that basically it is disabling the AWD features. For instance, mine came on with a bad O2 sensor.



P0128 is a cooling system code. The engine thinks it doesn't get up to normal operating temperature. Could be faulty temp sensor, low coolant, stuck thermostat, or something else. What year is the Pilot?
 
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