P1172 Code - Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High
Quick Answer
The P1172 diagnostic trouble code (DTC) indicates that the Rear Air/Fuel (A/F) Sensor Bank 1 Sensor 1 circuit is registering a high voltage that is out of the expected range. Common causes include Faulty Rear A/F Sensor Bank 1 Sensor 1, Wiring or connector issues, ECU malfunction. 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 indicates Rear A/F Sensor Bank 1 Sensor 1 Circuit Out Of Range High.
- Common causes
- Common causes include Faulty Rear A/F Sensor Bank 1 Sensor 1, Wiring or connector issues, ECU malfunction.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1172 Description
The P1172 diagnostic trouble code (DTC) indicates that the Rear Air/Fuel (A/F) Sensor Bank 1 Sensor 1 circuit is registering a high voltage that is out of the expected range. This sensor is responsible for monitoring the air-fuel mixture in the exhaust system, providing feedback to the engine control unit (ECU) to optimize combustion efficiency. When the sensor detects a voltage that is too high, it can lead to inaccuracies in fuel delivery, affecting the vehicle's performance and emissions.
Common Causes of P1172
- Faulty Rear A/F Sensor Bank 1 Sensor 1
- Wiring or connector issues
- ECU malfunction
- Exhaust system leaks
- Fuel system problems
Symptoms of P1172
- Decreased fuel efficiency
- Rough idling or stalling
- Check Engine Light illuminated
- Poor acceleration or lack of power
- Increased emissions
How to Fix P1172
- Diagnose the issue using a scan tool to verify the P1172 code and pinpoint the source of the problem.
- Inspect the wiring and connectors associated with the Rear A/F Sensor for any damage or corrosion.
- Test the sensor's voltage output and compare it to the manufacturer's specifications to determine if it is functioning correctly.
- Replace the Rear A/F Sensor Bank 1 Sensor 1 if it is determined to be faulty.
- Clear the DTC and reset the ECU to see if the issue has been resolved.
Cost to Fix P1172
The typical repair costs for addressing a P1172 code can vary depending on the cause of the issue and the specific vehicle. In general, replacing a Rear A/F Sensor Bank 1 Sensor 1 can range from $150 to $300 for the part, with additional costs for labor. Overall, the total repair cost including parts and labor may fall in the range of $250 to $500. It is advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model.
Need more information about the P1172 code?
Need more information on how to fix the P1172 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1172 code diagnosed by a professional: Find a repair shop in your area
Code P1172 Information for Specific Makes
- P1172 Acura — Air Fuel Ratio Sensor Circuit Out of Range High
- P1172 Audi — Throttle Actuation Potentiometer Signal 2 Signal Too Low
- P1172 BMW — Ambient Pressure Sensor Rationality Check
- P1172 Chevrolet — Fuel Pump Insufficient Flow
- P1172 Ford — Rotor Control Fault
- P1172 GMC — Fuel Pump Insufficient Flow
- P1172 Honda — Air Fuel Ratio Sensor Circuit Out of Range High
- P1172 Hyundai — Electronic Throttle System Improper Motor Current
- P1172 Land Rover — LH Bank Lambda Control Adaption Over Time Too Small
- P1172 MINI — Ambient Pressure Sensor Rationality Check
- P1172 Suzuki — Lambda Controller Limit Malfunction Bank 1 Too Lean
- P1172 Volkswagen — Throttle Actuation Potentiometer Signal 2 Signal Too Low
- P1172 Volvo — Long Term Fuel Trim
Frequently Asked Questions about P1172 Code
No Frequently Asked Questions about P1172 Code found.
Discuss the causes and fixes for P1172 OBDII Code
Code P1172 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.