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P1172 Honda Code - Air Fuel Ratio Sensor Circuit Out of Range High

Quick Answer

The Air/Fuel Ratio (A/F) Sensor 1 is installed in the exhaust system and detects oxygen content in the exhaust gas. Common causes include Faulty Air/Fuel Ratio Sensor Bank 1 Sensor 1, Air/Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted, Air/Fuel Ratio Sensor Bank 1 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
P1172 Honda indicates Air Fuel Ratio Sensor Circuit Out of Range High.
Common causes
Common causes include Faulty Air/Fuel Ratio Sensor Bank 1 Sensor 1, Air/Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted, Air/Fuel Ratio Sensor Bank 1 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.
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Code Popularity 55,718
How popular is this code, among other codes? Medium
What is this?
Table of contents Created and updated by William Orellana on Sep 02, 2025
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Code P1172 Honda Description

The Air/Fuel Ratio (A/F) Sensor 1 is installed in the exhaust system and detects oxygen content in the exhaust gas. The A/F sensor transmits output voltage to the Powertrain Control Module (PCM). If a malfunction causes the A/F Sensor (Sensor 1) signal to the PCM to deviate from the normal control area, the A/F Sensor (Sensor 1) may still become active after the engine starts, but the air/fuel feedback does not start normally, and the emissions deteriorate. When the A/F Sensor (Sensor 1) output is out of the normal area, and this condition continues after the A/F Sensor (Sensor 1) is active, the PCM detects a malfunction and stores a Diagnostic Trouble Code (DTC).
OBDII Code P1172 Honda - Air Fuel Ratio Sensor Circuit Out of Range High - AutoCodes.com
P1172 Honda Code - Air Fuel Ratio Sensor Circuit Out of Range High
What does this mean?

What are the Possible Causes of the DTC P1172 Honda?

  • Faulty Air/Fuel Ratio Sensor Bank 1 Sensor 1
  • Air/Fuel Ratio Sensor Bank 1 Sensor 1 harness is open or shorted
  • Air/Fuel Ratio Sensor Bank 1 Sensor 1 circuit poor electrical connection

How to Fix the DTC P1172 Honda?

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 P1172 Honda 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 P1172 Honda code?

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Need Help with the Code?

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Information for Specific Honda Models

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.

Frequently Asked Questions about P1172 Honda Code

No Frequently Asked Questions about P1172 Honda Code found.

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  • Having problem with p1172 and P2a00 codes popping up also having miss fire's is that do to p0339 code as well

    Reply to Comment

  • What model and year is your Honda? you may have to have a valve adjustment. If the valves are not adjusted properly, the engine may have a misfire and trigger air/fuel ratio codes.

    Reply to Comment

  • My 2017 Honda CR-V Touring is throwing codes P1172, P2A00, PO134, and UO199. Bank 1, Sensor 1 is affected. I also recently got a new battery and had loss of power when installing it. Some of the systems are incomplete as to readiness; however this one is listed as Complete and Fail.

    The problems started in the severe cold and after spinning tires to get up a hill in the ice and snow. (I don’t know if that’s relevant or not.)

    Ideas?

    Reply to Comment

  • All codes point to faulty Air/Fuel Ratio Sensor Bank 1 Sensor 1. Start by checking the sensor connector. If the connector is not damage or disconnected, then you must replace the sensor.

    P1172 HONDA - Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High
    Read more: https://www.autocodes.com/p...

    P2A00 HONDA - Air/Fuel Ratio Sensor 1 Bank 1 Circuit Range/Performance Problem
    Read more: https://www.autocodes.com/p...

    P0134 HONDA - Air/Fuel Ratio Sensor Bank 1, Sensor 1 Heater System Malfunction
    Read more: https://www.autocodes.com/p...

    The U0199 code is not related to the Air/Fuel Ratio Sensor.

    U0199 HONDA - Immobilizer-Keyless Control Unit Lost Communication With Door Multiplex Control Unit
    Read more: https://www.autocodes.com/u...

    Reply to Comment
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