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Code P0138 is intermittent, that is code comes on after couple of days off and again, what caused that

Vehicle: 2010 Cadillac CTS 3.0L

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P0138 H02S circuit high voltage Bank 1 Sensor 2

Circuit high codes are disconnection or open circuit, when a H02S begins to fail its the heater internal  circuit that begins to develop problems, The fix is more than likely will be replace the H02S sensor

Read more : https://www.autocodes.com/p0138.html

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