Question about 1996 Chevrolet Tahoe
P0138 is a code for an unexpected high voltage in the post cat o2 sensor on the left side (bank 1 sensor 2). It often is a result of an internal short between the oxygen sensor heater and the actual oxygen sensor. I would clear the core and if it returns replace the sensor.
Posted on Oct 06, 2009
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Posted on Jan 02, 2017
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