AutoCodes – Audi – P0412 Audi

P0412 Audi Code - Secondary Air Injection System Switching Valve 'A' Circuit Malfunction

Quick Answer

An air pump is used on the vehicle to lower tail pipe emissions on start-up. Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0412 Audi indicates Secondary Air Injection System Switching Valve 'A' Circuit Malfunction.
Common causes: Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 6,302

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0412 Audi Description

An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.

OBDII Code P0412 Audi - Secondary Air Injection System Switching Valve 'A' Circuit Malfunction - AutoCodes.com — P0412 Audi Code - Secondary Air Injection System Switching Valve 'A' Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0412 Audi?

Faulty Air Pump inoperative
Air bypass solenoid harness is open or shorted
Air bypass solenoid circuit poor electrical connection

How to Fix the DTC P0412 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 P0412 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.

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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 P0412 Audi Code

1. What are the common symptoms of OBDII code P0412 in an Audi?

The common symptoms of code P0412 in an Audi include rough idling, decreased engine performance, and an illuminated check engine light.

2. What does the OBDII code P0412 indicate in an Audi?

Code P0412 indicates a malfunction in the Secondary Air Injection System Switching Valve 'A' circuit in an Audi.

3. What are the possible causes of OBDII code P0412 in an Audi?

Possible causes of code P0412 in an Audi include a faulty secondary air injection system switching valve 'A', damaged wiring or connectors, or a problem with the engine control module.

4. How can I diagnose the OBDII code P0412 in my Audi?

Diagnosing code P0412 in an Audi involves using a scan tool to retrieve the code, inspecting the secondary air injection system components, and testing the switching valve 'A' for proper functionality.

5. Can I continue driving my Audi with OBDII code P0412?

It is not recommended to continue driving your Audi with code P0412 as it can lead to further damage to the engine and emissions system. It is best to address the issue promptly.

6. How can I repair OBDII code P0412 in my Audi?

Repairing code P0412 in an Audi may involve replacing the faulty secondary air injection system switching valve 'A', repairing damaged wiring or connectors, or reprogramming the engine control module.

7. Are there any DIY tips for fixing OBDII code P0412 in an Audi?

If you are experienced with automotive repairs, you may attempt to inspect and replace the switching valve 'A' yourself. However, for accurate diagnosis and repair, it is recommended to consult a professional mechanic.

8. Will OBDII code P0412 cause my Audi to fail emissions testing?

Yes, code P0412 can cause your Audi to fail emissions testing as it indicates a malfunction in the secondary air injection system, which is crucial for reducing emissions.

9. How much does it typically cost to repair OBDII code P0412 in an Audi?

The cost of repairing code P0412 in an Audi can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from different mechanics.

10. Can OBDII code P0412 in an Audi be prevented?

Regular maintenance and timely repairs of the secondary air injection system components can help prevent OBDII code P0412 from occurring in an Audi.