AutoCodes – Subaru – P0198 Subaru

P0198 Subaru Code - Engine Oil Temperature Sensor 'A' Circuit High

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: P0198 Subaru indicates Engine Oil Temperature Sensor 'A' Circuit High.
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 20,791

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 P0198 Subaru 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 P0198 Subaru - Engine Oil Temperature Sensor 'A' Circuit High - AutoCodes.com — P0198 Subaru Code - Engine Oil Temperature Sensor 'A' Circuit High

What does this mean?

What are the Possible Causes of the DTC P0198 Subaru?

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 P0198 Subaru?

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 P0198 Subaru 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 P0198 Subaru code?

Need more information on how to fix the P0198 Subaru code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0198 Subaru 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 P0198 Subaru Code

1. What are the common symptoms of OBDII code P0198 in a Subaru related to the engine oil temperature sensor?

Symptoms may include the check engine light illuminating on the dashboard, inaccurate oil temperature readings on the gauge, and potential issues with the vehicle's fuel efficiency.

2. What are some possible causes of OBDII code P0198 in a Subaru?

Common causes include a faulty engine oil temperature sensor, damaged sensor wiring or connectors, low engine oil level or poor oil quality, and issues with the vehicle's engine control module (ECM).

3. How can I diagnose the OBDII code P0198 in my Subaru?

Diagnosis typically involves using an OBDII scanner to read the specific trouble code, checking the engine oil temperature sensor for proper operation, inspecting sensor wiring for damage, and verifying oil levels and quality.

4. Can I drive my Subaru with OBDII code P0198 present?

It is generally not recommended to drive the vehicle with this code unresolved, as it can lead to potential engine performance issues and reduced fuel efficiency. It is advisable to address the problem promptly.

5. What are some repair tips for fixing OBDII code P0198 in a Subaru?

Repair options may include replacing the engine oil temperature sensor, repairing or replacing damaged wiring or connectors, ensuring proper engine oil levels and quality, and resetting the ECM to clear the trouble code.

6. Is it possible to reset the OBDII code P0198 in a Subaru without fixing the underlying issue?

While you can clear the trouble code using an OBDII scanner, the underlying issue causing the code will likely persist. It is important to address the root cause of the problem to prevent future issues.

7. How much does it typically cost to repair OBDII code P0198 in a Subaru?

The cost of repair can vary depending on the specific cause of the issue and whether you choose to fix it yourself or take it to a professional mechanic. Costs may include parts, labor, and diagnostic fees.

8. Can extreme temperatures or driving conditions trigger OBDII code P0198 in a Subaru?

Yes, extreme temperatures or driving conditions can sometimes affect the engine oil temperature sensor's performance, leading to the triggering of this trouble code. It's essential to monitor and maintain proper operating conditions.

9. Are there any preventive measures to avoid OBDII code P0198 in a Subaru?

Regularly monitoring engine oil levels and quality, performing routine maintenance checks, and addressing any issues with the engine oil temperature sensor promptly can help prevent the occurrence of this trouble code.

10. Can OBDII code P0198 in a Subaru cause any long-term damage if left untreated?

While the immediate effects may be minimal, prolonged driving with unresolved issues related to this code can potentially lead to engine performance problems, reduced fuel efficiency, and other related issues. Addressing the problem early is advisable.