AutoCodes - OBDII Code List - P1155 TOYOTA

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

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

P1155 TOYOTA 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 TOYOTA?

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 TOYOTA code

Labor: 1.0

The cost of diagnosing the P1155 TOYOTA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected?

The P1155 is set when the Engine Control Module (ECM) detects a heated oxygen sensor heater circuit malfunction

Possible Symptoms

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

P1155 Toyota Description

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.
OBDII Code P1155 Toyota - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1 -

P1155 TOYOTA More Information

Need more information on how to fix the P1155 TOYOTA code?
Get Access to Factory Service Manuals

Information for specific Toyota models

Need more help?

Get the P1155 Toyota code diagnosed by a professional: Find a repair shop in your area


Help us improve Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P1155 Toyota code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧