P0139 Diagnostic Trouble Code Discussion for December 2007
Heated Oxygen Sensor (Bank 1 Sensor 2) Slow Response
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| Help Request | Posted | |
| 1999 Mercury Villager Estate 3.3L MIL Lamp on VIN: 4M2XV11T9X P0139: Heated Oxygen Sensor (Bank 1 Sensor 2) Slow Response. I replaced the rear 02 sensor and of course the problem is still there. Scan tool reads a constant .300 volts, even after 10 minutes of driving. Power to the heater circuit is good, but at no time will the computer ground the heater. Tested front 02 sensor and... |
December 19, 2007 |
