For Shop Owners

P0155 - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3 What does this mean?

Possible causes

  • Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
  • Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse
  • Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground
  • Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
What does this mean?

Tech notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The Engine Control Module (ECM) monitors how long it take the sensor to warm up and start sending an adequate signal. The code means the the sensor is taking too long to warm up. Replacing the Front Heated Oxygen Sensor (H2OS) Bank 2 usually takes care of the problem.
What does this mean?

When is the code detected?

The current amperage in the front heated oxygen sensor heater circuit is out of the normal range. (An improper voltage drop signal is sent to ECM through the front heated oxygen sensor heater)

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible higher fuel consumption
  • Possible more smoke from exhaust than usual

P0155 Description

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM). In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground. The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
OBDII Code P0155 - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1 - itimaster.ru

P0155 Information for specific makes

P0155 ACURA A/F Sensor 21 Heater System Malfunction
P0155 AUDI HO2S21 Sensor Heater Circuit
P0155 BMW O2 Sensor Heater Circuit Bank 2 Sensor 1
P0155 BUICK HO2S Heater Performance Bank 2 Sensor 1
P0155 CADILLAC HO2S Heater Performance Bank 2 Sensor 1
P0155 CHEVROLET HO2S Heater Performance Bank 2 Sensor 1
P0155 CHRYSLER O2 Sensor 2/1 Heater Performance
P0155 DODGE O2 Sensor 2/1 Heater Performance
P0155 FORD O2 Heater Circuit Bank 2 Sensor 1
P0155 GMC HO2S Heater Performance Bank 2 Sensor 1
P0155 HONDA A/F Sensor 21 Heater System Malfunction
P0155 HYUNDAI HO2S Heater Circuit Bank 2 Sensor 1
P0155 INFINITI O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1
P0155 JEEP O2 Sensor 2/1 Heater Performance
P0155 KIA HO2S21 Heater Circuit
P0155 LEXUS O2 Sensor Heater Circuit Bank 2 Sensor 1
P0155 MAZDA HO2S21 Heater Circuit Fault
P0155 MERCEDES-BENZ O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1
P0155 MINI O2 Sensor Heater Circuit Bank 2 Sensor 1
P0155 MITSUBISHI HO2S 21 Heater Performance
P0155 NISSAN O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1
P0155 PONTIAC HO2S Heater Performance Bank 2 Sensor 1
P0155 SATURN HO2S Heater Performance Bank 2 Sensor 1
P0155 TOYOTA O2 Sensor Heater Circuit Bank 2 Sensor 1
P0155 VOLKSWAGEN HO2S21 Sensor Heater Circuit

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P0155 Comments

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Any information is appreciated. Thanks
Repair Importance Level: 2
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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