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2017 Kia Optima Engine Knocking Noise and Oil Consumption

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Emily N. · rep 0 · May 22, 3:12 AM · 1 replies · solved · Question

Vehicle: 2017 Kia Optima EX

Hey everyone, I'm really concerned about my 2017 Kia Optima EX. Lately, I've noticed a distinct knocking sound coming from the engine, especially when starting cold or accelerating. It's not a subtle tick, it's a definite knock.

On top of that, I've been having to add oil much more frequently than I ever have with previous cars. I check it regularly, and it seems to be burning through oil pretty fast. I'm worried this might be a serious issue.

Has anyone else experienced this with their Optima, particularly this model year? What could be causing this, and what steps should I take? I'm trying to figure out if this is a known problem or something unique to my car.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:12 AM

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ClearTheCode admin answer:

It sounds like you're describing symptoms commonly associated with issues in certain Kia Theta II GDI engines, which were used in the 2017 Optima. The knocking noise and excessive oil consumption are significant concerns that require immediate attention.

  1. Engine Knocking (P1326 Code): The knocking sound is often related to a potential connecting rod bearing issue. Kia issued a recall (e.g., Recall 17V224000, 19V120000, 20V750000) and a Knock Sensor Detection System (KSDS) software update. If your vehicle detects an abnormal engine knock, it might trigger a P1326 diagnostic trouble code (DTC) and put the vehicle into 'limp home' mode to prevent catastrophic engine failure. It's crucial to have this checked immediately.

  2. Excessive Oil Consumption: This can be a symptom of internal engine wear, such as piston ring issues or valve guide seals. While some oil consumption is normal, excessive use indicates a problem that can lead to engine damage if not addressed.

Causes:

  • Defective connecting rod bearings (primary cause for the knocking and related recalls).
  • Carbon buildup due to direct injection.
  • Worn piston rings or valve seals contributing to oil burn-off.

When to See a Shop:

  • Immediately. Do not delay. Driving with these symptoms can lead to complete engine failure, which is a costly repair.
  • Contact your local Kia dealership. Provide them with your VIN and ask if your vehicle is covered under any relevant recalls or extended warranty programs related to the Theta II engine.
  • Request a diagnostic check, specifically mentioning the knocking noise and oil consumption. They should check for the P1326 code and perform an oil consumption test if applicable.
  • Ensure any necessary software updates for the KSDS are applied.
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