AutoCodes – Generic – P118A

P118A 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 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 4,504

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

What does this mean?

What are the Possible Causes of the DTC P118A?

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

How to Fix the DTC P118A?

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 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 P118A code?

Need more information on how to fix the P118A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P118A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P118A Audi — Bank 3 Probe 1 Voltage Too Low Leakage Air
P118A Volkswagen — Bank 3 Probe 1 Voltage Too Low Leakage Air

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 Code

1. What are the common symptoms of OBDII code P118A (Bank 3 Probe 1 Voltage Too Low Leakage Air)?

The common symptoms of code P118A may include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.

2. What are the possible causes of OBDII code P118A?

Possible causes of code P118A can include a faulty oxygen sensor, vacuum leaks, exhaust system leaks, wiring issues, or a malfunctioning catalytic converter.

3. How can I diagnose OBDII code P118A?

Diagnosing code P118A typically involves using an OBDII scanner to retrieve the specific fault code, performing a visual inspection for leaks, checking the oxygen sensor's wiring and connections, and conducting a smoke test to detect air leaks.

4. Can a DIY enthusiast repair OBDII code P118A at home?

Some DIY enthusiasts may be able to repair code P118A at home by replacing the faulty oxygen sensor, repairing any leaks, or fixing wiring issues. However, complex repairs involving the catalytic converter or extensive wiring may require professional assistance.

5. How urgent is it to address OBDII code P118A?

While the vehicle may still be operable with code P118A present, it is important to address the issue promptly to prevent potential damage to the engine or emissions system and to ensure optimal performance and fuel efficiency.

6. Are there any quick tips to troubleshoot OBDII code P118A?

Quick troubleshooting tips for code P118A include checking for visible leaks, ensuring the oxygen sensor is securely connected, and inspecting the exhaust system for any damage or corrosion.

7. Can OBDII code P118A cause damage to other vehicle components?

If left unresolved, code P118A can potentially cause damage to the catalytic converter, reduce engine performance, and lead to higher emissions levels, impacting the overall drivability of the vehicle.

8. Is it safe to continue driving with OBDII code P118A illuminated?

While it may be safe to drive with the code present, prolonged driving with code P118A can result in reduced fuel efficiency, increased emissions, and potential engine damage, so it is advisable to address the issue promptly.

9. Will resetting the OBDII system clear code P118A?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing code P118A is not addressed, the code is likely to reappear once the vehicle is driven and the system performs another diagnostic check.

10. How much does it typically cost to repair OBDII code P118A?

The cost of repairing code P118A can vary depending on the specific cause of the issue, the labor rates in your area, and whether any parts need to be replaced. Repairs for code P118A can range from relatively inexpensive for minor fixes to more costly for complex issues like catalytic converter replacement.