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I disconnected and reconnected, replaced this sensor 3 months ago, and is popping up again, what now?

Vehicle: 2001 Dodge Ram 1500 v8 5.9L oxy sensor

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Hi there,

The O2 sensor is only one possible cause for this code. Here is a list of other possible causes for you.

P0138 DODGE - O2 Sensor 1/2 Circuit High

Read more: https://www.autocodes.com/p0138_dodge.html

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