P0298 critical

Engine Oil Over Temperature

The P0298 code means the vehicle's onboard diagnostic system has detected: Engine Oil Over Temperature. This is a critical severity code.

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Keep driving?
Yes, but fix soon
DIY difficulty
no
Estimated cost
$50 - $800 (parts and labor)
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Common Symptoms

  • Check Engine Light on or flashing
  • Engine oil temperature warning on dashboard
  • Possible burning oil smell
  • Engine may enter limp mode or shut down

Probable Causes (Ranked by Likelihood)

  • Low engine oil level Very High
  • Faulty engine oil cooler High
  • Clogged oil passages restricting flow Moderate
  • Faulty oil temperature sensor giving false reading Low

Step-by-Step Diagnostic Procedure

  1. Check engine oil level immediately. Top off if low.

  2. Read engine oil temperature PID on scan tool. Normal operating temperature is 200-240F (93-115C).

  3. Inspect engine oil cooler for leaks or blockage.

  4. Verify oil temperature sensor accuracy by comparing to an infrared thermometer reading on the oil pan.

Frequently Asked Questions

Is P0298 a serious code?

Yes, excessive oil temperature can cause rapid engine wear, oil breakdown, and potential engine seizure. Stop driving immediately and check oil level.

What temperature is too hot for engine oil?

Engine oil above 260F (127C) begins to break down rapidly. Above 300F (149C), oil can lose its lubricating properties and cause severe engine damage.

Can low oil cause over-temperature?

Yes, low oil level is the most common cause. Less oil means each molecule cycles through the engine more frequently, absorbing more heat with less time to cool.

Sources

This page is built from documented references. Verify against your own service info before repair work.

P0298 on Diesel, EV & Equipment

The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:

Power Stroke moderate Engine Oil Over Temperature

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