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2017 Optima Engine Knocking and Oil Consumption Concerns

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Ryan M. · rep 0 · May 22, 3:11 AM · 1 replies · solved · Question

Vehicle: 2017 Kia Optima SX

Hey everyone, I'm reaching out because I'm really worried about my 2017 Kia Optima SX. Lately, I've noticed a distinct knocking sound coming from the engine, especially when I accelerate. It's not constant, but it's definitely there and getting more frequent.

On top of that, I've been adding oil way more often than I should. I check it regularly, and it seems to be burning through oil at an alarming rate. I'm worried this could be a serious issue. Has anyone else experienced this with their Optima, particularly this model year? What steps did you take?

I'm trying to figure out if this is a known problem or if I should be preparing for a major repair. Any advice on what to look for or what to tell the dealership would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:11 AM

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ClearTheCode admin answer:

Your concerns about engine knocking and excessive oil consumption in your 2017 Kia Optima are serious and warrant immediate attention. This issue has been widely reported for certain Kia and Hyundai models from this era, often linked to manufacturing defects in the engine.

Here's what you should do:

  1. Check for Recalls/TSBs: Kia has issued several recalls and Technical Service Bulletins (TSBs) related to engine issues, including connecting rod bearing wear and excessive oil consumption, for various models and years. Use your VIN to check the NHTSA website (nhtsa.gov) or Kia's owner portal for any open recalls or relevant TSBs for your specific vehicle.
  2. Document Everything: Keep meticulous records of your oil top-offs, including dates, mileage, and the amount of oil added. Also, note down when you hear the knocking sound and under what conditions.
  3. Get a Diagnostic Scan: While a knocking sound might not always trigger a standard check engine light, some severe engine issues can. A common diagnostic trouble code (DTC) associated with engine knocking in these vehicles is P1326 (Knock Sensor Detection System). This code indicates that the engine control unit (ECU) has detected an abnormal vibration pattern consistent with engine knocking. Even without a P1326, a comprehensive scan can reveal other underlying issues.
  4. Contact a Kia Dealership: Schedule an appointment with an authorized Kia service center. Explain your symptoms clearly and provide all your documentation. Be prepared for them to perform an oil consumption test and potentially an engine inspection.

Causes: The primary cause for these issues in affected Kia engines (like the 2.4L GDI and 2.0L Turbo GDI) has been identified as premature wear of the connecting rod bearings, which can lead to engine knocking and eventual seizure. This wear can also contribute to increased oil consumption.

When to See a Shop: You should see a shop immediately. Driving with a knocking engine and excessive oil consumption can lead to catastrophic engine failure, which is a significant safety hazard and a much more expensive repair. Do not delay this diagnosis.

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