P1521 Code - Incorrect Engine Oil Type

Quick Answer

The P1521 code indicates that the engine oil type being used in the vehicle is incorrect. Common causes include Incorrect oil added during an oil change, Using oil with the wrong viscosity rating, Mixing different types of oil in the engine. 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

P1521 indicates Incorrect Engine Oil Type.

Common causes

Common causes include Incorrect oil added during an oil change, Using oil with the wrong viscosity rating, Mixing different types of oil in the engine.

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.

• Description
• Common Causes
• Symptoms
• How To Fix
• Cost to Fix
• Tech Notes
• FAQs
• Comments
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Common Causes of P1521

Symptoms of P1521

How to Fix P1521

Cost to Fix P1521

Tech Notes for P1521

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Code P1521 Information for Specific Makes

• P1521 Audi — Intake Manifold Changeover Valve 2 Circuit Electrical Malfunction
• P1521 BMW — Oil Condition Sensor
• P1521 Buick — Transmission Engaged At High Throttle Angle
• P1521 Cadillac — Transmission Engaged At High Throttle Angle
• P1521 Chevrolet — Transmission Engaged at High Throttle Angle
• P1521 Chrysler — Incorrect Engine Oil Type
• P1521 Dodge — Incorrect Engine Oil Type
• P1521 GMC — Transmission Engaged at High Throttle Angle
• P1521 Hyundai — Power Steering Switch Circuit
• P1521 Isuzu — Commanded Versus Actual Throttle Position Correlation Small Stop Close
• P1521 Jeep — Incorrect Engine Oil Type
• P1521 KIA — Power Steering Switch Circuit
• P1521 Mazda — Variable Resonance Induction System Solenoid Valve 1 Malfunction
• P1521 MINI — Oil Condition Sensor
• P1521 RAM — Incorrect Engine Oil Type
• P1521 Subaru — Brake Switch Circuit Range
• P1521 Volkswagen — Intake Manifold Changeover Valve 2 Circuit Electrical Malfunction

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 P1521 Code

1. What are the common symptoms of OBDII code P1521 (Incorrect Engine Oil Type)?

- Common symptoms include rough engine operation, reduced power, and illuminated warning lights on the dashboard.

2. What are the possible causes of OBDII code P1521?

- The code P1521 can be triggered by using the wrong type of engine oil, a malfunctioning oil pressure sensor, or issues with the oil pressure control system.

3. How does using the incorrect engine oil type lead to OBDII code P1521?

- Using the wrong engine oil can affect the oil pressure and viscosity, causing the engine to operate improperly and triggering the P1521 code.

4. Can OBDII code P1521 be reset without addressing the underlying issue?

- Resetting the code without addressing the root cause, such as using the correct engine oil, may temporarily clear the code but will likely result in it reoccurring.

5. What should I do if I encounter OBDII code P1521?

- First, check the engine oil type and ensure it meets the manufacturer's specifications. If the correct oil is being used, it's advisable to have the oil pressure system checked by a mechanic.

6. Is it safe to continue driving with OBDII code P1521 present?

- It is not recommended to continue driving with the P1521 code present, as it can lead to engine damage or further complications if not addressed promptly.

7. Can OBDII code P1521 be fixed by simply changing the engine oil?

- In some cases, simply changing to the correct engine oil type may resolve the P1521 code. However, if the issue persists, further diagnosis by a professional may be necessary.

8. Are there any DIY tips for troubleshooting OBDII code P1521?

- DIY tips include checking the engine oil level and type, inspecting for any oil leaks, and ensuring the oil pressure sensor is functioning correctly.

9. How much does it typically cost to repair OBDII code P1521?

- The cost of repairing OBDII code P1521 can vary depending on the underlying cause. Repairs may range from a simple oil change to more complex fixes involving the oil pressure system.

10. Can OBDII code P1521 affect the overall performance of the vehicle?

- Yes, OBDII code P1521 can impact the engine's performance, leading to issues such as decreased power, rough idling, and potential engine damage if left unresolved.