OBD Guide
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P1521

Incorrect Engine Oil Type

P1521 is an OBD-II diagnostic trouble code meaning: Incorrect Engine Oil Type. Common causes: using oil with the wrong viscosity, using oil that does not meet manufacturer specifications. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Increased engine noise
  • Increased oil consumption
  • Unstable operation at idle

Causes

  • Using oil with the wrong viscosity
  • Using oil that does not meet manufacturer specifications
  • Low quality motor oil
  • Overheating of oil with loss of properties
  • Error when changing oil

How to Fix

  1. Check the type of oil used according to the owner's manual
  2. Change oil and oil filter to proper specifications
  3. Reset the error using an OBD-II scanner
  4. Check the condition of the engine for possible damage

Related codes

P1520P1522P1523

Error P1521 by Vehicle Brand

BuickCadillacChevroletChryslerGMGMCOldsmobileSaturnVolkswagen

FAQ

What does the P1521 code mean?

P1521 is an OBD-II diagnostic trouble code that indicates: Incorrect Engine Oil Type

What causes a P1521 error code?

The most common causes of P1521 include: Using oil with the wrong viscosity; Using oil that does not meet manufacturer specifications; Low quality motor oil; Overheating of oil with loss of properties.

How do I fix a P1521 diagnostic trouble code?

To fix P1521: Check the type of oil used according to the owner's manual. Change oil and oil filter to proper specifications. Reset the error using an OBD-II scanner. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1521?

Limited driving only, diagnose soon

How much does it cost to fix P1521?

The estimated repair cost for P1521 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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