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Loud Engine Knocking in my 2018 Kia Sorento - is this the Theta II issue?

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Mike T. · rep 0 · May 24, 1:24 PM · 1 replies · solved · Question

Vehicle: 2018 Kia Sorento LX

Hey everyone,

I'm reaching out because I'm getting really concerned about my 2018 Kia Sorento LX. Lately, I've noticed a distinct, loud knocking sound coming from the engine, especially when I accelerate or when the engine is under load. It's not constant, but it's definitely getting worse and more frequent.

I've also been checking my oil more often, and it seems like I'm burning through oil faster than usual. I'm having to add a quart or two between oil changes, which never used to happen. I'm worried this might be related to the well-known Kia engine issues I've read about online, specifically the Theta II engine problems.

Has anyone else experienced this with their 2018 Sorento or similar Kia models? I'm trying to figure out if this is something I should be seriously concerned about and if it falls under any extended warranty or recall programs. Any advice on what steps I should take next would be greatly appreciated before I head to the dealership.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 24, 1:24 PM

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ClearTheCode admin answer:

It sounds like you're experiencing symptoms commonly associated with the Kia Theta II engine issues, which primarily affect certain 2.0L and 2.4L GDI engines. The knocking sound and increased oil consumption are significant indicators that warrant immediate attention.

Here's what you should do:

  1. Stop Driving Immediately (if severe): If the knocking sound is very loud and persistent, or if your check engine light is flashing, it's safest to stop driving the vehicle to prevent further damage. Have it towed to a reputable service center or Kia dealership.
  2. Check for Recalls/TSBs: Kia has issued several recalls and extended warranties related to the Theta II engine, including a Knock Sensor Detection System (KSDS) software update (Recall SC176/SC200) and an extended warranty for connecting rod bearing failure. Your 2018 Sorento likely falls within the affected model years. You can check your VIN on the NHTSA website or Kia's owner portal to see if your specific vehicle is covered.
  3. Diagnostic Scan: A professional diagnostic scan will be crucial. While there might not be a specific OBD-II code for 'engine knock,' the KSDS update, if applied, is designed to detect early signs of rod bearing wear and may trigger a P1326 code. Other codes related to misfires (P030X) or engine performance could also be present.
  4. Causes: The primary cause of concern here is potential connecting rod bearing wear, which can lead to catastrophic engine failure. The increased oil consumption can also be related to internal engine wear or issues with piston rings.
  5. When to See a Shop: You should schedule an appointment with a Kia dealership as soon as possible. Explain your symptoms clearly, mentioning the knocking sound and oil consumption. Inquire about the Theta II engine recall (SC176/SC200) and any extended warranties for engine replacement. Be prepared for a thorough inspection, which may include an engine tear-down to assess internal components.

It's important to act quickly, as these issues can escalate. Document all your service visits and communications with the dealership.

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