P0138 shorted to volts

Tiny
BROKEN19901990
  • MEMBER
  • 2001 JEEP GRAND CHEROKEE
  • 4.7L
  • AUTOMATIC
  • 160,000 MILES
My vehicle is the limited with a v8. I am wanting to know what 02 sensors that code is for? It says bank 1 sensor 2, but I do not know which one that is. I looked them up online but there are several that say bank 1 sensor 2 that look different than each other. Please help
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Tuesday, September 19th, 2017 AT 12:43 PM

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Tiny
CARADIODOC
  • EXPERT
Bank 1 is driver's side. Sensor two is the downstream sensor, after the catalytic converter. That oxygen sensor can be shorted internally, but it is much more common to have wires melted and shorted together in the wiring harness, or there is corrosion built up between two terminals in the connector. The secret is to watch the signal voltage on a scanner, and see what it changes to when the sensor is unplugged. If you do not have a scanner, depending on the model year, the check engine light may turn off when you do something to remove the short, (unplug the sensor or wiggle the harness), or it should turn off after you remove the short, then cycle the ignition switch off and back on. I do not think you need to erase the diagnostic fault code for the check engine light to turn off, but if you do, disconnect the battery negative cable for a minute.
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Tuesday, September 19th, 2017 AT 11:45 PM

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