AutoCodes – Mercedes-Benz – P0197 Mercedes-Benz

P0197 Mercedes-Benz Code - Engine Oil Temperature Sensor Low

Quick Answer

The engine oil temperature sensor is used to detect the engine oil temperature. Common causes include Faulty Engine Oil Temperature sensor, Engine Oil Temperature sensor harness is open or shorted, Engine Oil 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: P0197 Mercedes-Benz indicates Engine Oil Temperature Sensor Low.
Common causes: Common causes include Faulty Engine Oil Temperature sensor, Engine Oil Temperature sensor harness is open or shorted, Engine Oil 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 4,553

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0197 Mercedes-Benz Description

The engine oil temperature sensor is used to detect the engine oil temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine oil temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

OBDII Code P0197 Mercedes-Benz - Engine Oil Temperature Sensor Low - AutoCodes.com — P0197 Mercedes-Benz Code - Engine Oil Temperature Sensor Low

What does this mean?

What are the Possible Causes of the DTC P0197 Mercedes-Benz?

Faulty Engine Oil Temperature sensor
Engine Oil Temperature sensor harness is open or shorted
Engine Oil Temperature sensor circuit poor electrical connection

How to Fix the DTC P0197 Mercedes-Benz?

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 P0197 Mercedes-Benz 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 P0197 Mercedes-Benz code?

Need more information on how to fix the P0197 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0197 Mercedes-Benz 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 P0197 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0197 in a Mercedes-Benz related to the Engine Oil Temperature Sensor Low?

- Common symptoms include inaccurate oil temperature readings on the dashboard, illuminated check engine light, and potential engine performance issues.

2. What are the typical causes of OBDII code P0197 in a Mercedes-Benz?

- The code P0197 usually indicates a malfunction in the engine oil temperature sensor, wiring issues, or a faulty sensor connector.

3. How can I diagnose the cause of OBDII code P0197 in my Mercedes-Benz?

- Diagnosing the issue involves checking the engine oil temperature sensor and its wiring for any signs of damage, corrosion, or loose connections. It may also require using an OBDII scanner to retrieve and analyze the code.

4. Can a low engine oil level trigger OBDII code P0197 in a Mercedes-Benz?

- Yes, a low engine oil level can indirectly affect the oil temperature sensor readings and potentially trigger the P0197 code. It's important to ensure the engine oil level is within the recommended range.

5. Is it safe to continue driving with OBDII code P0197 in a Mercedes-Benz?

- While the vehicle may still be operable with the P0197 code, it's recommended to address the issue promptly to prevent potential engine damage due to inaccurate oil temperature readings or other related issues.

6. How can I repair OBDII code P0197 in my Mercedes-Benz?

- Repairing the P0197 code typically involves replacing the faulty engine oil temperature sensor, repairing any damaged wiring or connectors, and clearing the trouble code with an OBDII scanner.

7. Are there any DIY tips for resolving OBDII code P0197 in a Mercedes-Benz?

- DIY enthusiasts with automotive experience may attempt to replace the engine oil temperature sensor themselves following manufacturer guidelines. However, it's advisable to consult a professional if unsure.

8. Can extreme weather conditions impact the engine oil temperature sensor and trigger OBDII code P0197 in a Mercedes-Benz?

- Yes, extreme cold or hot weather conditions can affect the accuracy of the engine oil temperature sensor readings and potentially lead to the P0197 trouble code being triggered.

9. Is resetting the check engine light sufficient after addressing OBDII code P0197 in a Mercedes-Benz?

- In addition to resetting the check engine light, it's essential to verify that the issue causing the P0197 code has been successfully resolved by conducting a thorough diagnostic check and ensuring proper sensor functionality.

10. How can regular maintenance help prevent OBDII code P0197 from occurring in a Mercedes-Benz?

- Regular maintenance, including scheduled oil changes, inspection of sensor connections, and monitoring oil levels, can help prevent issues with the engine oil temperature sensor that may trigger the P0197 trouble code.