AutoCodes – Generic – P118F

P118F Code - Exhaust Gas Temperature Sensor 2 Performance Engine Running

Quick Answer

The exhaust gas temperature sensors are variable resistors that measure the temperature of the exhaust gas. Common causes include Faulty Exhaust Gas Temperature Sensor, Exhaust Gas Temperature Sensor harness is open or shorted, Exhaust Gas Temperature Sensor circuit poor electrical connection. 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: P118F indicates Exhaust Gas Temperature Sensor 2 Performance Engine Running.
Common causes: Common causes include Faulty Exhaust Gas Temperature Sensor, Exhaust Gas Temperature Sensor harness is open or shorted, Exhaust Gas Temperature Sensor circuit poor electrical connection.
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 1,460

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 Mar 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P118F Description

The exhaust gas temperature sensors are variable resistors that measure the temperature of the exhaust gas. The exhaust temperature sensor 1 is the first exhaust temperature sensor on the exhaust system, the following exhaust temperature sensors are counted upward from the engine outlet to the exhaust system end. The Engine Control Module (ECM) supplies 5 V to the exhaust gas temperature signal circuit and supplies a ground to the low reference circuit. The exhaust gas temperature sensor temperature information is used by the ECM during the exhaust gas particulate filter cleaning process. The Diagnostic Trouble Code (DTC) will be set if the ECM detects that the difference between measured exhaust gas temperature and the estimated exhaust gas temperature is greater than a calibrated amount for greater than 1 s.

OBDII Code P118F - Exhaust Gas Temperature Sensor 2 Performance Engine Running - AutoCodes.com — P118F Code - Exhaust Gas Temperature Sensor 2 Performance Engine Running

What does this mean?

What are the Possible Causes of the DTC P118F?

Faulty Exhaust Gas Temperature Sensor
Exhaust Gas Temperature Sensor harness is open or shorted
Exhaust Gas Temperature Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P118F?

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 P118F 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 P118F code?

Need more information on how to fix the P118F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P118F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P118F Buick — Exhaust Gas Temperature Sensor 2 Performance Engine Running
P118F Cadillac — Exhaust Gas Temperature Sensor 2 Performance Engine Running
P118F Chevrolet — Exhaust Gas Temperature Sensor 2 Performance Engine Running
P118F GMC — Exhaust Gas Temperature Sensor 2 Performance Engine Running

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 P118F Code

1. What are the common symptoms of OBDII code P118F (Exhaust Gas Temperature Sensor 2 Performance Engine Running)?

The common symptoms of code P118F may include reduced engine performance, increased fuel consumption, and illuminated Check Engine Light.

2. What can cause OBDII code P118F to trigger?

Code P118F can be triggered by issues such as a faulty exhaust gas temperature sensor, wiring problems, exhaust leaks, or issues with the engine control module.

3. How serious is OBDII code P118F?

While OBDII code P118F may not cause immediate harm to the vehicle, it can lead to reduced engine efficiency and performance if left unresolved. It is recommended to address the issue promptly.

4. What should I do if my vehicle shows OBDII code P118F?

If your vehicle displays code P118F, it is advisable to have the exhaust gas temperature sensor and related components inspected by a qualified mechanic to determine the root cause of the issue.

5. Can I continue driving with OBDII code P118F present?

It is generally not recommended to drive with an unresolved OBDII code like P118F, as it can lead to further damage to the vehicle and potentially affect engine performance.

6. How can I repair OBDII code P118F?

Repairing OBDII code P118F may involve replacing the faulty exhaust gas temperature sensor, repairing any wiring issues, fixing exhaust leaks, or addressing problems with the engine control module.

7. Are there any DIY tips for troubleshooting OBDII code P118F?

While some basic troubleshooting like checking for loose or damaged wiring connections can be done by DIY enthusiasts, diagnosing and repairing code P118F may require specialized tools and expertise.

8. Can a faulty exhaust gas temperature sensor cause other issues besides triggering code P118F?

Yes, a faulty exhaust gas temperature sensor can lead to issues such as poor fuel efficiency, reduced engine power, and increased emissions if not functioning correctly.

9. How much does it typically cost to repair OBDII code P118F?

The cost of repairing OBDII code P118F can vary depending on the root cause of the issue, the cost of parts, and labor charges. It is recommended to obtain a quote from a trusted mechanic.

10. Is it possible for code P118F to be a false alarm?

While rare, there is a possibility of a false alarm triggering code P118F. In such cases, it is advisable to have the vehicle thoroughly inspected to rule out any underlying issues.