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2018 Optima SX Turbo Engine Knocking and Oil Consumption

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Mike T. · rep 0 · May 22, 3:06 AM · 1 replies · solved · Question

Vehicle: 2018 Kia Optima SX Turbo

Hi all,

I'm reaching out about my 2018 Kia Optima SX Turbo. For the past few months, I've noticed a distinct knocking sound coming from the engine, especially when starting cold or under acceleration. It sounds like it's coming from the bottom end.

On top of that, the car has been consuming an excessive amount of oil. I have to add a quart every 1,500-2,000 miles, which seems way too high for a car with only 70,000 miles on it. The check engine light came on last week, and when I scanned it, I got a P1326 code.

I've heard about issues with the Theta II engines in other Kia/Hyundai models. Could this be related? What are my options here? I'm really concerned about the longevity of my engine.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:06 AM

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Hello Mike T.,

Your description of engine knocking, excessive oil consumption, and the P1326 diagnostic trouble code on your 2018 Kia Optima SX Turbo points directly to a known issue with the Theta II GDI engines. This is a serious concern that requires immediate attention.

Understanding P1326 and Theta II Issues:

  • P1326 - Knock Sensor Detection System: This code is specific to Kia and Hyundai vehicles with Theta II engines. It indicates that the Engine Control Unit (ECU) has detected an abnormal pattern of engine knocking, often indicative of connecting rod bearing wear or other internal engine damage. The ECU will typically put the vehicle into a 'limp home' mode to prevent further damage.
  • Theta II Engine Problems: These engines (2.0L and 2.4L GDI) have been subject to recalls and extended warranties due to manufacturing defects that can lead to premature bearing wear, excessive oil consumption, and catastrophic engine failure. The knocking sound you hear is a classic symptom of this internal wear.

When to See a Shop (Immediately):

  1. Stop Driving: If your check engine light is on with P1326, it is strongly advised to stop driving the vehicle immediately. Continuing to drive could lead to complete engine failure.
  2. Contact Kia Dealership: This issue is often covered under extended warranties or recalls related to the Theta II engine. You should contact your local Kia dealership and inform them of the symptoms and the P1326 code. They will perform a specific diagnostic procedure related to this code.
  3. Warranty Check: Provide your VIN to the dealership to check for any active recalls, service campaigns, or extended warranty coverage that applies to your engine. Many owners have had their engines replaced under these programs.
  4. Documentation: Keep records of all oil changes, oil top-offs, and any previous maintenance to demonstrate proper care of the vehicle.

Given the P1326 code and the known history of these engines, it's highly probable that your engine is experiencing internal failure. A dealership visit is crucial for proper diagnosis and potential engine replacement under warranty.

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