AutoCodes – Generic – P1155

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

Quick Answer

Air-Fuel Ratio (A/F)sensor need to reach a minimum operating temperature of 1200 degrees F to produce an accurate voltage signal. Common causes include 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. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1155 indicates Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1.
Common causes: Common causes include 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.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 26,594

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 03, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1155 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 - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1 - AutoCodes.com — P1155 Code - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P1155?

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 to Fix the DTC P1155?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1155 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1155 code?

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

Need Help with the Code?

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

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

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.