What does code p0155 mean - 2004 Chevrolet Avalanche

See if this helps... P0155 02 Sensor Heater Circuit Malfunction Bank 2 Sensor 1 Good luck.... boy some of these vague code can drive ya nuts.

This code refers to the front oxygen sensor on Bank 2. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it.

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That's a code for an o2 sensor.bank #2 upstream sensor concern. There are 4 o2 sensors, actually 2 o2 sensors 2 monitors, this ode is for the sensor closest to the motor on bank #2...a o2 code doesn't always mean you have a bad sensor, could be a variety of concerns triggering the o2 to read out of range.avvacuum leak, fuel system concern, misfire.needs to be diagnosed by a mechanic

P0155 = 2/1 O2 Sensor Heater Failure, Oxygen sensor heater element malfunction. logic dictates that you replace your O2 Sensor. DIY car obd2 code scanner online shopping