AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Acura - P1172 Acura

P1172 Acura Code - Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High

- Code Popularity: 13,928 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC P1172 Acura?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Air/Fuel Ratio Bank 1 Sensor 1
  • Air/Fuel Ratio Bank 1 Sensor 1 harness is open or shorted
  • Air/Fuel Ratio Bank 1 Sensor 1 circuit poor electrical connection
⚠ Does your Acura have Safety Recalls? → Check here

How to Fix the DTC P1172 Acura?

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

Search for P1172 Acura Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1172 Acura code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

Code P1172 Acura 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 Engine Control Module (ECM). A heater for the sensor element is embedded in the A/F sensor (sensor 1). It is activated and heats the sensor to stabilize and speed the detection of oxygen content by controlling current flowing through the heater. An increase in the current levels off as the applied voltage to the element electrode reaches a certain range because the amount of oxygen which is led through the diffusion layer is limited. The current amperage is proportional to oxygen content in the exhaust gas, so the air/fuel ratio is detected by the measurement of the current amperage. The ECM compares a set target air/fuel ratio with the detected air/fuel ratio and controls the fuel injection timing.
If the A/F sensor (sensor 1) voltage is low, the air/fuel ratio is lean, and the ECM uses A/F feedback control to issue a Rich command. If the A/F sensor (sensor 1) voltage is high, the air/fuel ratio is rich, and the ECM uses A/F feedback control to issue a Lean command.

OBDII Code P1172 Acura - Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High - AutoCodes.com
P1172 Acura Code - Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High

Need More Information on the Code?

Need more information on how to fix the P1172 Acura code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1172 Acura code diagnosed by a professional: Find a repair shop in your area

Code P1172 Acura comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P1172 Acura code? Have you replaced any parts?
Any information is appreciated. Thanks