Engine-Codes.com
Engine-Codes – Generic – P122F

P122F Code - Nitrogen Oxide Sensor Binary Oxygen Sensor Short Circuit

Quick Answer

The P122F diagnostic trouble code (DTC) indicates a problem with the Nitrogen Oxide (NOx) sensor binary oxygen sensor short circuit in the vehicle's exhaust system. Common causes include Wiring Issues: Damaged or corroded wiring connections to the NOx sensor can cause a short circuit, Sensor Malfunction: The NOx sensor itself may be faulty and require replacement, Exhaust System Damage: Physical damage to the exhaust system, such as a leak or crack, can affect the sensor's operation. 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
P122F indicates Nitrogen Oxide Sensor Binary Oxygen Sensor Short Circuit.
Common causes
Common causes include Wiring Issues: Damaged or corroded wiring connections to the NOx sensor can cause a short circuit, Sensor Malfunction: The NOx sensor itself may be faulty and require replacement, Exhaust System Damage: Physical damage to the exhaust system, such as a leak or crack, can affect the sensor's operation.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 05, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P122F Description

The P122F diagnostic trouble code (DTC) indicates a problem with the Nitrogen Oxide (NOx) sensor binary oxygen sensor short circuit in the vehicle's exhaust system. The NOx sensor is responsible for monitoring the levels of nitrogen oxide emissions in the exhaust gases and providing feedback to the engine control module (ECM) to ensure optimal combustion and reduce harmful emissions. A short circuit in the binary oxygen sensor can disrupt the sensor's ability to accurately measure NOx levels, leading to potential performance issues and increased emissions. If left unaddressed, this issue can cause the vehicle to fail emissions tests, reduce fuel efficiency, and potentially harm the environment.

OBDII Code P122F - Nitrogen Oxide Sensor Binary Oxygen Sensor Short Circuit
P122F Code - Nitrogen Oxide Sensor Binary Oxygen Sensor Short Circuit

Common Causes of P122F

  1. Wiring Issues: Damaged or corroded wiring connections to the NOx sensor can cause a short circuit.
  2. Sensor Malfunction: The NOx sensor itself may be faulty and require replacement.
  3. Exhaust System Damage: Physical damage to the exhaust system, such as a leak or crack, can affect the sensor's operation.
  4. ECM Malfunction: A malfunctioning engine control module (ECM) can send incorrect signals to the NOx sensor, triggering the short circuit code.

Symptoms of P122F

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A faulty NOx sensor can cause the engine to run less efficiently, leading to decreased fuel economy.
  3. Increased Emissions: The vehicle may emit higher levels of nitrogen oxide pollutants due to the inaccurate readings from the NOx sensor.
  4. Rough Idling or Misfires: A short circuit in the sensor can cause the engine to idle roughly or experience misfires.

How to Fix P122F

  1. Diagnose the Issue: Use a scan tool to retrieve the DTC and pinpoint the location of the fault in the NOx sensor or wiring.
  2. Inspect Wiring: Check the wiring harness for any signs of damage or corrosion and repair or replace as needed.
  3. Replace NOx Sensor: If the sensor is found to be faulty, replace it with a new OEM or high-quality aftermarket sensor.
  4. Clear DTC: Reset the ECM to clear the DTC and ensure that the repair has resolved the issue.
  5. Test Drive: Take the vehicle for a test drive to verify that the repair has successfully addressed the problem.

Cost to Fix P122F

The cost of repairing a P122F code can vary depending on the specific cause of the issue and the vehicle make and model. On average, the cost of replacing a NOx sensor and addressing wiring issues can range from $200 to $500, including parts and labor. However, it is important to note that labor rates at auto repair shops can vary significantly, with rates typically ranging from $80 to $150 per hour. Additionally, diagnostic time and any additional repairs may increase the overall cost of addressing this code. It is advisable to consult with a qualified mechanic or service center to obtain a more accurate estimate based on the specific circumstances of the vehicle.

Need more information about the P122F code?

Need more information on how to fix the P122F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P122F code diagnosed by a professional: Find a repair shop in your area

Code P122F Information for Specific Makes

  • P122F BMW — Nitrogen Oxide Sensor Binary Oxygen Sensor Short Circuit
  • P122F MINI — Nitrogen Oxide Sensor Binary Oxygen Sensor Short Circuit
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 P122F Code

1. What are the common symptoms of OBDII code P122F (Nitrogen Oxide Sensor Binary Oxygen Sensor Short Circuit)?

- Common symptoms include poor engine performance, decreased fuel efficiency, and illuminated Check Engine Light.

2. What usually causes the OBDII code P122F to trigger?

- The code P122F is typically triggered by a short circuit in the binary oxygen sensor associated with the nitrogen oxide sensor.

3. How can I diagnose the issue related to OBDII code P122F?

- Diagnosing the issue involves using an OBDII scanner to retrieve the code and inspecting the wiring and connections of the nitrogen oxide sensor and binary oxygen sensor.

4. Can a faulty nitrogen oxide sensor cause code P122F?

- Yes, a faulty nitrogen oxide sensor or issues with its wiring can lead to the triggering of code P122F.

5. What repair options are available for fixing OBDII code P122F?

- Repair options may include replacing the nitrogen oxide sensor, repairing any damaged wiring or connections, or resetting the fault code after addressing the issue.

6. Is it safe to continue driving with OBDII code P122F present?

- It is recommended not to drive for an extended period with the code present to avoid potential damage to the vehicle's emissions system.

7. Can a DIY enthusiast fix OBDII code P122F at home?

- Depending on the cause of the code, some DIY enthusiasts may be able to address the issue by replacing the sensor or repairing the wiring themselves.

8. How can I prevent OBDII code P122F from recurring in the future?

- Regularly inspecting and maintaining the nitrogen oxide sensor and its related components can help prevent the recurrence of code P122F.

9. Will resetting the fault code make OBDII code P122F disappear permanently?

- Resetting the fault code may clear the Check Engine Light temporarily, but if the underlying issue is not fixed, the code is likely to reappear.

10. Is it necessary to visit a mechanic for OBDII code P122F diagnosis and repair?

- While some may be able to address the issue themselves, consulting a mechanic for accurate diagnosis and professional repair is often recommended for OBDII code P122F.

Discuss the causes and fixes for P122F OBDII Code

Submit a New Comment

Code P122F comments

No comments found for this page.