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P0155 Diagnostic Trouble Code Discussion for September 2008

Heated Oxygen Sensor (Bank 2 Sensor 1) Heater Performance

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Trouble Ticket Help Requests for DTC P0155
Help Request Posted
1997 Mercury Cougar XR-7 3.8L MIL Lamp on VIN: 1MELM6245V
P0155: o2 Heater Circuit Bank 2 sensor 1 fault. I followed pinpoint charts for testing voltage from and back to computer on vpwr and heater circuits. Battery voltage on both. Checked resistance at o2 heaters and found both to be less than 2ohms.Replaced both bank 2 sensors. Then got bank 1 sensor 1 heater f...
September 10, 2008