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P0139 Diagnostic Trouble Code Discussion for January 2022

Heated Oxygen Sensor (Bank 1 Sensor 2) Slow Response

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Trouble Ticket Help Requests for DTC P0139
Help Request Posted
2008 Jeep Wrangler Unlimited Sahara 3.8L MIL Lamp on VIN: 1J4GA59168
P0139: B2S1 O2 sensor slow response. We have spent much time and effort on this one. Customer installed a Bosch sensor and the code returned so he brought it to us. We had scopes on all four wires of both front sensors and indeed it would almost flat line after running a bit. Heaters were com...
January 20, 2022