AutoCodes – Buick – P22F9 Buick

P22F9 Buick Code - NOx Sensor 1 Performance Slow Response Low To High

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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: P22F9 Buick indicates NOx Sensor 1 Performance Slow Response Low To High.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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 406

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 29, 2024

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

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

Code P22F9 Buick Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within the sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.

OBDII Code P22F9 Buick - NOx Sensor 1 Performance Slow Response Low To High - AutoCodes.com — P22F9 Buick Code - NOx Sensor 1 Performance Slow Response Low To High

What does this mean?

What are the Possible Causes of the DTC P22F9 Buick?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P22F9 Buick?

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 P22F9 Buick 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 P22F9 Buick code?

Need more information on how to fix the P22F9 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22F9 Buick code diagnosed by a professional: Find a repair shop in your area

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 P22F9 Buick Code

1. What are the common symptoms of OBDII code P22F9 (NOx Sensor 1 Performance Slow Response Low To High)?

- Common symptoms include poor engine performance, reduced fuel efficiency, and potential illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P22F9 in a Buick related to the NOx Sensor 1 performance slow response low to high?

- Possible causes may include a faulty NOx sensor, issues with the sensor wiring or connections, exhaust system leaks, or a malfunctioning engine control module.

3. How can I diagnose the cause of OBDII code P22F9 in my Buick?

- Diagnosis typically involves using a diagnostic scanner to retrieve the code, checking the NOx sensor and its wiring for any visible damage, and performing a thorough inspection of the exhaust system for leaks.

4. Can a faulty NOx sensor cause other issues in my Buick besides triggering code P22F9?

- Yes, a faulty NOx sensor can lead to increased emissions, reduced engine efficiency, and potential damage to the catalytic converter over time.

5. Is it safe to continue driving my Buick with OBDII code P22F9 present?

- It is not recommended to continue driving with code P22F9 present, as it can negatively impact the engine's performance and emissions control system.

6. How can I repair OBDII code P22F9 in my Buick related to NOx Sensor 1 performance slow response low to high?

- Repair options may include replacing the NOx sensor, repairing any damaged wiring or connections, fixing exhaust leaks, or reprogramming the engine control module.

7. Are there any maintenance tips to prevent OBDII code P22F9 from reoccurring in my Buick?

- Regular maintenance, such as keeping up with recommended service intervals, using quality fuel, and addressing any engine performance issues promptly, can help prevent the recurrence of code P22F9.

8. Can a DIY enthusiast fix OBDII code P22F9 in a Buick at home?

- While some aspects of diagnosing and repairing code P22F9 can be done at home, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair to ensure the issue is resolved effectively.

9. How long does it typically take to repair OBDII code P22F9 in a Buick?

- The repair time for code P22F9 can vary depending on the exact cause of the issue and the extent of repairs needed. It is advisable to consult with a mechanic for a more accurate estimate of repair time.

10. Will resetting the Check Engine Light make OBDII code P22F9 disappear in my Buick?

- Resetting the Check Engine Light may temporarily turn off the light, but if the underlying issue causing code P22F9 is not addressed, the light is likely to come back on as the system detects the fault again.