AutoCodes – Audi – P0426 Audi

P0426 Audi Code - Catalyst Temperature Sensor Range/Performance Bank 1 Sensor 1

Quick Answer

The Engine Control Module (ECM) monitors the Catalyst Temperature Sensor Circuit Performance, which measures the temperature of the catalyst. Common causes include Faulty Catalyst Temperature Sensor, Catalyst Temperature Sensor harness is open or shorted, Catalyst Temperature Sensor 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: P0426 Audi indicates Catalyst Temperature Sensor Range/Performance Bank 1 Sensor 1.
Common causes: Common causes include Faulty Catalyst Temperature Sensor, Catalyst Temperature Sensor harness is open or shorted, Catalyst Temperature Sensor 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 4,293

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 Aug 20, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0426 Audi Description

The Engine Control Module (ECM) monitors the Catalyst Temperature Sensor Circuit Performance, which measures the temperature of the catalyst. Catalyst Temperature Sensor function by increasing their resistance with increasing exhaust gas temperature. The ECM sets the OBDII code when the Catalyst Temperature Sensor signal is not to factory specifications.

OBDII Code P0426 Audi - Catalyst Temperature Sensor Range/Performance Bank 1 Sensor 1 - AutoCodes.com — P0426 Audi Code - Catalyst Temperature Sensor Range/Performance Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0426 Audi?

Faulty Catalyst Temperature Sensor
Catalyst Temperature Sensor harness is open or shorted
Catalyst Temperature Sensor circuit poor electrical connection

How to Fix the DTC P0426 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 P0426 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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Need more information on how to fix the P0426 Audi code? Get Access to Factory Service Manuals

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Get the P0426 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 P0426 Audi Code

1. What are common symptoms of OBDII code P0426 in an Audi related to the Catalyst Temperature Sensor?

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

2. What can cause the OBDII code P0426 in an Audi?

- The code P0426 in an Audi is typically caused by a faulty catalyst temperature sensor, issues with the sensor wiring, or a malfunction in the sensor circuit.

3. How can I diagnose the Catalyst Temperature Sensor related issues triggering the OBDII code P0426 in my Audi?

- Diagnosis typically involves using a scan tool to retrieve the code, inspecting the sensor and its wiring for any damage or corrosion, and testing the sensor's resistance and voltage output.

4. Can a faulty oxygen sensor trigger the OBDII code P0426 in an Audi?

- Yes, a faulty oxygen sensor can cause incorrect readings that may trigger the P0426 code related to the Catalyst Temperature Sensor.

5. What is the importance of the Catalyst Temperature Sensor in an Audi's emission control system?

- The Catalyst Temperature Sensor helps monitor and regulate the temperature of the catalytic converter, which is crucial for optimal emission control and overall engine performance.

6. Is it safe to continue driving my Audi with the OBDII code P0426 present?

- It is not recommended to drive your Audi with the P0426 code present, as it can lead to further damage to the catalytic converter and potentially impact the vehicle's performance.

7. Can I repair the OBDII code P0426 issue in my Audi myself?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, it is recommended to have a professional mechanic diagnose and repair the underlying cause of the P0426 code to ensure proper resolution.

8. How much does it typically cost to repair the OBDII code P0426 in an Audi?

- The cost of repairing the P0426 code in an Audi can vary depending on the specific issue causing the code, but it may involve replacing the catalyst temperature sensor or repairing the sensor wiring, which can range from a few hundred to over a thousand dollars.

9. Will resetting the Check Engine Light make the OBDII code P0426 disappear permanently?

- Resetting the Check Engine Light may temporarily clear the code, but if the underlying issue triggering the P0426 code is not addressed, the code is likely to reappear once the problem is detected again.

10. How long does it take to repair the OBDII code P0426 issue in an Audi?

- The repair time for the P0426 code in an Audi can vary depending on the specific cause of the issue and the availability of parts, but it may take anywhere from a few hours to a full day to diagnose and fix the problem.