AutoCodes – Volkswagen – P118B Volkswagen

P118B Volkswagen Code - Bank 4 Probe 2 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: P118B Volkswagen indicates Bank 4 Probe 2 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 1,625

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 P118B Volkswagen 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 P118B Volkswagen - Bank 4 Probe 2 Voltage Too Low Leakage Air - AutoCodes.com — P118B Volkswagen Code - Bank 4 Probe 2 Voltage Too Low Leakage Air

What does this mean?

What are the Possible Causes of the DTC P118B Volkswagen?

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

How to Fix the DTC P118B Volkswagen?

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 P118B Volkswagen 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 P118B Volkswagen code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P118B Volkswagen 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 P118B Volkswagen Code

1. What are common symptoms of OBDII code P118B in a Volkswagen related to Bank 4 Probe 2 Voltage Too Low Leakage Air?

The common symptoms include rough idling, poor fuel efficiency, and potential engine stalling.

2. What are the possible causes of OBDII code P118B in a Volkswagen indicating Bank 4 Probe 2 Voltage Too Low Leakage Air?

Potential causes include a faulty oxygen sensor, vacuum leaks, exhaust leaks, or issues with the fuel system.

3. How can I diagnose the OBDII code P118B in a Volkswagen pointing to Bank 4 Probe 2 Voltage Too Low Leakage Air?

Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the oxygen sensor, checking for vacuum and exhaust leaks, and testing the fuel system components.

4. What are the repair tips for resolving OBDII code P118B in a Volkswagen indicating Bank 4 Probe 2 Voltage Too Low Leakage Air?

Repair tips may include replacing the faulty oxygen sensor, fixing any vacuum or exhaust leaks, cleaning or replacing fuel system components, and clearing the error code.

5. Can driving with OBDII code P118B in a Volkswagen showing Bank 4 Probe 2 Voltage Too Low Leakage Air cause further damage?

Continuing to drive with this code may lead to decreased performance, reduced fuel efficiency, and potential damage to the catalytic converter over time.

6. How much does it typically cost to fix OBDII code P118B in a Volkswagen related to Bank 4 Probe 2 Voltage Too Low Leakage Air?

The cost of repairs can vary depending on the specific issue, but it may range from around $100 for a basic oxygen sensor replacement to several hundred dollars for more extensive repairs.

7. Are there any preventive measures to avoid OBDII code P118B in a Volkswagen indicating Bank 4 Probe 2 Voltage Too Low Leakage Air?

Regular maintenance, such as timely replacement of oxygen sensors, checking for leaks during routine inspections, and using high-quality fuel, can help prevent this code from appearing.

8. How long can I safely drive with OBDII code P118B in a Volkswagen showing Bank 4 Probe 2 Voltage Too Low Leakage Air before getting it fixed?

It is recommended to address the issue as soon as possible to prevent further damage to the engine or emissions system. Continuing to drive with the code may worsen fuel efficiency and engine performance.

9. Will resetting the OBDII system clear the P118B code in a Volkswagen related to Bank 4 Probe 2 Voltage Too Low Leakage Air?

Resetting the system may temporarily clear the code, but it will likely reappear if the underlying issue is not fixed. It's essential to diagnose and repair the root cause of the problem.

10. Can a DIY enthusiast fix OBDII code P118B in a Volkswagen indicating Bank 4 Probe 2 Voltage Too Low Leakage Air?

While some simple repairs like replacing an oxygen sensor may be possible for DIY enthusiasts, diagnosing and fixing complex issues related to this code may require professional expertise and specialized tools.