AutoCodes – Audi – P2431 Audi

P2431 Audi Code - Secondary Air Injection System Air Flow/Pressure Bank 1 Sensor Circuit Range/Performance

Quick Answer

The AIR system refers to an emissions control system used by some vehicle manufacturers. Common causes include Faulty Secondary Air Pressure Sensor, Secondary Air Pressure Sensor harness is open or shorted, Secondary Air Pressure 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: P2431 Audi indicates Secondary Air Injection System Air Flow/Pressure Bank 1 Sensor Circuit Range/Performance.
Common causes: Common causes include Faulty Secondary Air Pressure Sensor, Secondary Air Pressure Sensor harness is open or shorted, Secondary Air Pressure 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 2,067

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 Aug 19, 2020

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 P2431 Audi Description

The AIR system refers to an emissions control system used by some vehicle manufacturers. It is often called secondary air injection, because air, more specifically oxygen, is injected into the exhaust manifold after startup. Vehicles start on a comparatively rich mixture to allow for smoother running conditions. However, this has a significant impact on exhaust gas emissions. A notable increase in hydrocarbon (HC) and carbon monoxide (CO) emissions are found under these rich start conditions. By injecting air into the exhaust manifold the CO and HC can be oxidized. This reaction increases the temperature within the exhaust and the exhaust gas after-treatment system i.e. catalytic converter can begin working earlier due to meeting its light-off temperature.
The system consists of an air pump, a one-way check valve, and associated pipework. The system operates for a predetermined time after startup. Normally this duration is three minutes, when cold.

OBDII Code P2431 Audi - Secondary Air Injection System Air Flow/Pressure Bank 1 Sensor Circuit Range/Performance - AutoCodes.com — P2431 Audi Code - Secondary Air Injection System Air Flow/Pressure Bank 1 Sensor Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P2431 Audi?

Faulty Secondary Air Pressure Sensor
Secondary Air Pressure Sensor harness is open or shorted
Secondary Air Pressure Sensor circuit poor electrical connection

How to Fix the DTC P2431 Audi?

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 P2431 Audi 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 P2431 Audi code?

Need more information on how to fix the P2431 Audi code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2431 Audi 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 P2431 Audi Code

1. What are common symptoms of OBDII code P2431 in an Audi?

- Common symptoms include illuminated check engine light, rough idle, decreased engine performance, and increased emissions.

2. What causes the OBDII code P2431 in an Audi?

- The code is typically triggered by issues with the secondary air injection system, such as a faulty air flow/pressure sensor, wiring problems, or a malfunctioning control module.

3. How serious is OBDII code P2431 in an Audi?

- While the code itself may not cause immediate harm to the vehicle, it can lead to increased emissions and potential long-term damage if left unresolved.

4. How can I diagnose OBDII code P2431 in my Audi?

- Diagnosis typically involves using a scan tool to retrieve the fault code, inspecting the secondary air injection system components, and testing the sensor and related wiring for proper functionality.

5. Can I continue driving my Audi with OBDII code P2431?

- It is not recommended to continue driving with this code as it can lead to poor engine performance, increased emissions, and potential damage to the catalytic converter.

6. How can I repair OBDII code P2431 in my Audi?

- Repairs may involve replacing the faulty air flow/pressure sensor, repairing damaged wiring, or reprogramming the control module. It is recommended to consult a professional mechanic for proper diagnosis and repair.

7. Are there any DIY tips for addressing OBDII code P2431 in an Audi?

- DIY tips may include checking and cleaning sensor connections, inspecting for visible wiring damage, and ensuring proper air flow through the system. However, complex repairs may require professional assistance.

8. Can a dirty air filter cause OBDII code P2431 in an Audi?

- While a dirty air filter can impact engine performance, it is unlikely to directly cause this specific OBDII code. Focus on inspecting the secondary air injection system components for issues.

9. Will resetting the check engine light resolve OBDII code P2431 in an Audi?

- Resetting the check engine light may temporarily turn off the indicator, but it will not address the underlying issue triggering the code. Proper diagnosis and repair are necessary for a permanent solution.

10. How can I prevent OBDII code P2431 from recurring in my Audi?

- Regular maintenance of the secondary air injection system, including timely sensor replacements and inspections, can help prevent the recurrence of this code. Follow manufacturer recommendations for service intervals.