AutoCodes – Audi – P118A Audi

P118A Audi Code - Bank 3 Probe 1 Voltage Too Low Leakage Air

Quick Answer

The Engine Control Module (ECM) monitors the Oxygen Sensor. Common causes include Exhaust leaks, Faulty Oxygen Sensor, Oxygen Sensor harness is open or shorted. 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: P118A Audi indicates Bank 3 Probe 1 Voltage Too Low Leakage Air.
Common causes: Common causes include Exhaust leaks, Faulty Oxygen Sensor, Oxygen Sensor harness is open or shorted.
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.

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Code Popularity 1,928

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 Jul 27, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P118A Audi Description

The Engine Control Module (ECM) monitors the Oxygen Sensor. The ECM sets the OBDII code when the Oxygen Sensor is not to factory specifications.

OBDII Code P118A Audi - Bank 3 Probe 1 Voltage Too Low Leakage Air - AutoCodes.com — P118A Audi Code - Bank 3 Probe 1 Voltage Too Low Leakage Air

What does this mean?

What are the Possible Causes of the DTC P118A Audi?

Exhaust leaks
Faulty Oxygen Sensor
Oxygen Sensor harness is open or shorted
Oxygen Sensor circuit poor electrical connection

How to Fix the DTC P118A 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 P118A 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 P118A Audi Code

1. What does the OBDII code P118A mean on an Audi?

The code P118A indicates "Bank 3 Probe 1 Voltage Too Low Leakage Air," which typically points to an issue with the upstream oxygen sensor (probe 1) on bank 3 detecting an abnormally low voltage due to air leakage or sensor malfunction.

2. What are the symptoms of the P118A code in an Audi?

Common symptoms include poor fuel efficiency, rough idling, engine misfires, reduced performance, and possibly the illumination of the check engine light.

3. What causes the P118A code to appear in an Audi?

The code can be caused by a faulty oxygen sensor, air leaks in the intake or exhaust system, damaged wiring or connectors, or incorrect fueling due to engine control module (ECM) issues.

4. Where is Bank 3 Probe 1 located in an Audi?

Bank 3 refers to the third set of cylinders in engines with more than two banks, and probe 1 is the upstream oxygen sensor located before the catalytic converter on that bank.

5. How do I diagnose the P118A code in my Audi?

Start by inspecting the oxygen sensor wiring and connectors for damage, check for intake or exhaust leaks, and use a diagnostic tool to monitor real-time sensor voltage readings.

6. Can driving with the P118A code damage my Audi?

Driving with this code for prolonged periods can lead to poor engine performance and potential damage to the catalytic converter due to improper air-fuel mixture.

7. How do I fix the P118A code in an Audi?

Repairs may include replacing the oxygen sensor, fixing any intake or exhaust leaks, repairing wiring issues, or reprogramming the ECM if needed.

8. How much does it cost to fix the P118A code in an Audi?

The cost depends on the issue; replacing an oxygen sensor can range from $150 to $500, while repairing leaks or wiring may vary based on labor and parts.

9. Can a dirty air filter cause the P118A code?

A dirty air filter alone is unlikely to cause this code, but it could contribute to improper airflow, which might exacerbate related issues if combined with other problems.

10. Do I need professional help to resolve the P118A code?

While basic checks like inspecting wiring and connectors can be done at home, diagnosing and resolving more complex issues like intake leaks or sensor replacement may require professional assistance.