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P118F Cadillac Code - Exhaust Gas Temperature Sensor 2 Performance Engine Running

Quick Answer

The P118F diagnostic trouble code (DTC) indicates a performance issue with the Exhaust Gas Temperature (EGT) Sensor 2 while the engine is running. Common causes include Faulty EGT Sensor: The most direct cause is a malfunctioning EGT Sensor 2 that fails to provide accurate readings, Wiring Issues: Damaged or corroded wiring and connectors leading to the sensor can disrupt signal transmission, Exhaust Leaks: Leaks in the exhaust system can lead to incorrect temperature readings at the sensor. 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 Cadillac indicates Exhaust Gas Temperature Sensor 2 Performance Engine Running.
Common causes
Common causes include Faulty EGT Sensor: The most direct cause is a malfunctioning EGT Sensor 2 that fails to provide accurate readings, Wiring Issues: Damaged or corroded wiring and connectors leading to the sensor can disrupt signal transmission, Exhaust Leaks: Leaks in the exhaust system can lead to incorrect temperature readings at the sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 18, 2024
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Code P118F Cadillac Description

The P118F diagnostic trouble code (DTC) indicates a performance issue with the Exhaust Gas Temperature (EGT) Sensor 2 while the engine is running. This sensor plays a crucial role in monitoring the temperature of the exhaust gases as they exit the engine, providing essential data to the Engine Control Module (ECM) for optimizing fuel efficiency and emissions control. When the ECM detects that the readings from EGT Sensor 2 are outside of the expected range or inconsistent with the engine's operating conditions, it triggers this code.

OBDII Code P118F Cadillac - Exhaust Gas Temperature Sensor 2 Performance Engine Running
P118F Cadillac Code - Exhaust Gas Temperature Sensor 2 Performance Engine Running

Common Causes of P118F Cadillac

  1. Faulty EGT Sensor: The most direct cause is a malfunctioning EGT Sensor 2 that fails to provide accurate readings.
  2. Wiring Issues: Damaged or corroded wiring and connectors leading to the sensor can disrupt signal transmission.
  3. Exhaust Leaks: Leaks in the exhaust system can lead to incorrect temperature readings at the sensor.
  4. Contaminated Sensor: Accumulation of carbon deposits or other contaminants on the sensor can affect its performance.
  5. ECM Malfunction: In rare cases, a fault within the Engine Control Module itself may misinterpret sensor data.

Symptoms of P118F Cadillac

  1. Check Engine Light: The most common symptom is the illumination of the check engine light on the dashboard.
  2. Poor Fuel Economy: Drivers may notice a decrease in fuel efficiency due to improper fuel-air mixture adjustments.
  3. Engine Performance Issues: Symptoms such as rough idling, stalling, or hesitation during acceleration may occur.
  4. Increased Emissions: The vehicle may produce higher emissions, potentially leading to failure in emissions testing.
  5. Overheating of the Catalytic Converter: In severe cases, the catalytic converter may overheat, leading to further engine damage.

How to Fix P118F Cadillac

  1. Diagnostic Scan: Begin with a thorough diagnostic scan to confirm the P118F code and check for any additional codes that may provide further insight.
  2. Visual Inspection: Inspect the wiring and connectors associated with EGT Sensor 2 for signs of damage, corrosion, or loose connections.
  3. Sensor Replacement: If the sensor is determined to be faulty, replace EGT Sensor 2 with a new, OEM-quality part.
  4. Exhaust System Check: Inspect the exhaust system for leaks or blockages that could affect sensor performance, and repair as necessary.
  5. ECM Reprogramming: If the ECM is suspected to be at fault, it may require reprogramming or replacement to ensure accurate readings.

Cost to Fix P118F Cadillac

The typical repair costs for addressing a P118F code can vary significantly based on the specific vehicle model, the location of the repair shop, and the extent of the damage. On average, the cost for parts and labor may range from $200 to $600. This estimate includes the price of a new EGT sensor, which can cost between $50 to $150, and labor costs that generally fall between $80 to $150 per hour. It's important to note that labor rates can be higher at dealerships or in metropolitan areas, while independent shops may offer lower rates. For a more precise estimate, it's advisable to consult local repair shops and obtain quotes based on your vehicle's specific needs.

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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 P118F Cadillac Code

1. What are the common symptoms of OBDII code P118F in a Cadillac related to the Exhaust Gas Temperature Sensor 2 Performance Engine Running?

The common symptoms include reduced engine performance, decreased fuel efficiency, and potential issues with the exhaust system.

2. What are the possible causes of OBDII code P118F in a Cadillac?

Possible causes include a faulty exhaust gas temperature sensor, wiring issues, exhaust leaks, or a malfunctioning engine control module.

3. How can I diagnose the OBDII code P118F in a Cadillac related to the Exhaust Gas Temperature Sensor 2 Performance Engine Running?

Diagnosis typically involves using an OBDII scanner to read the code, inspecting the exhaust gas temperature sensor and its wiring, checking for exhaust leaks, and testing the engine control module.

4. What are the repair tips for fixing OBDII code P118F in a Cadillac?

Repair tips may include replacing the faulty exhaust gas temperature sensor, repairing any damaged wiring, fixing exhaust leaks, and reprogramming or replacing the engine control module if necessary.

5. Can I continue driving my Cadillac with the OBDII code P118F related to the Exhaust Gas Temperature Sensor 2 Performance Engine Running?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the engine and exhaust system. It's best to address the issue promptly.

6. How much does it typically cost to repair OBDII code P118F in a Cadillac?

The cost of repairs can vary depending on the exact cause of the code, but it may range from $100 to $500 or more, including parts and labor.

7. Are there any preventive measures to avoid OBDII code P118F in a Cadillac?

Regular maintenance, such as inspecting the exhaust system, checking sensor connections, and addressing any engine performance issues promptly, can help prevent this code from appearing.

8. Can a DIY enthusiast fix OBDII code P118F in a Cadillac?

If you have the necessary tools, knowledge, and experience working on automotive systems, you may be able to address some aspects of the issue yourself, such as sensor replacement or wiring repairs. However, more complex diagnostics and repairs may require professional assistance.

9. How urgent is it to address OBDII code P118F in a Cadillac?

It is recommended to address this code as soon as possible to prevent any further damage to the engine or exhaust system and ensure optimal vehicle performance and fuel efficiency.

10. Will resetting the OBDII code P118F in a Cadillac make it go away permanently?

Simply resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and repair the root cause of the problem to prevent recurrence.

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