Engine-Codes - Generic - P1155

P1155 - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?

P1155 Possible Causes

  • Faulty Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1
  • Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 harness is open or shorted
  • Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How do I fix code P1155

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Cost of diagnosing the P1155 code

Labor: 1.0

The cost of diagnosing the P1155 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1155 Meaning

Air-Fuel Ratio (A/F)sensor need to reach a minimum operating temperature of 1200 degrees F to produce an accurate voltage signal. The faster the air-fuel ratio 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 air-fuel ratio sensor. The ECM controls the air-fuel ratio 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.

P1155 More Information

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Information for specific makes

  • P1155 AUDI Manifold Absolute Pressure Sensor Short To Positive
  • P1155 BMW O2 Sensor Heater Circuit Intermittent Bank 2 Sensor 2
  • P1155 BUICK HO2S Lean Average Bank 2 Sensor 1
  • P1155 CADILLAC HO2S Lean Average Bank 2 Sensor 1
  • P1155 CHEVROLET HO2S Lean Average Bank 2 Sensor 1
  • P1155 CHRYSLER Fuel Rail Pressure Malfunction Rail Pressure Is Too High
  • P1155 DODGE Fuel Rail Pressure Malfunction Rail Pressure Is Too High
  • P1155 FORD Alternative Fuel Controller
  • P1155 GMC HO2S Lean Average Bank 2 Sensor 1
  • P1155 HYUNDAI ETS Limp Home Valve
  • P1155 JEEP Fuel Rail Pressure Malfunction Rail Pressure Is Too High
  • P1155 LEXUS Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1   
  • P1155 MINI O2 Sensor Heater Circuit Intermittent Bank 2 Sensor 2
  • P1155 SCION Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1   
  • P1155 SUBARU HO2S21 Sensor Circuit Range/Performance High
  • P1155 TOYOTA Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1   
  • P1155 VOLKSWAGEN Manifold Absolute Pressure Sensor Short To Positive

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