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2018 Sonata Engine Knocking & Oil Consumption - Is this normal?

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Chris P. · rep 0 · May 22, 3:03 AM · 1 replies · solved · Question

Vehicle: 2018 Hyundai Sonata SEL

Hey everyone,

I've got a 2018 Hyundai Sonata SEL with about 85,000 miles on it, and I've noticed a couple of concerning issues lately. First, there's a distinct knocking sound coming from the engine, especially noticeable when accelerating or at idle. It's not constant, but it's definitely there.

Secondly, I seem to be going through oil much faster than I should. I had an oil change about 3,000 miles ago, and the dipstick is already showing it's quite low. I don't see any obvious leaks under the car.

Are these common problems for this model year? I'm worried about engine reliability. What should I be looking for, or is this something that needs immediate professional attention? Any advice would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:03 AM

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ClearTheCode admin answer:

Your concerns about engine knocking and excessive oil consumption in your 2018 Hyundai Sonata are valid and should be addressed promptly. These symptoms can indicate serious underlying issues, some of which have been subject to extended warranties or recalls for certain Hyundai engines.

  1. Immediate Action: If you hear a persistent knocking sound, especially one that changes with engine RPM, stop driving the vehicle if possible. Continuing to drive could lead to catastrophic engine failure.
  2. Check for Diagnostic Trouble Codes (DTCs): A common code associated with engine knocking in these vehicles is P1326 (Knock Sensor Detection System). This code often triggers a 'limp home' mode to prevent further damage. Even if the check engine light isn't on, a pending code might be present.
  3. Causes of Engine Knocking & Oil Consumption:
    • Connecting Rod Bearing Failure: This is a well-documented issue for certain Hyundai/Kia GDI engines, including those found in the Sonata. The P1326 code is specifically designed to detect this type of damage.
    • Piston Ring Wear/Failure: Can lead to excessive oil consumption as oil bypasses worn piston rings and burns in the combustion chamber.
    • Carbon Buildup: Direct Injection engines can suffer from carbon buildup on intake valves, which can affect combustion efficiency and potentially lead to knocking, though less commonly the primary cause of severe knocking.
    • Low Oil Level: While a symptom, extremely low oil can exacerbate knocking due to lack of lubrication.
  4. When to See a Shop: You should schedule an appointment with a trusted mechanic or a Hyundai dealership immediately. Given the potential severity and the existence of extended warranties/recalls related to these engine issues, a dealership might be the best first step. They can perform a thorough diagnostic, including checking for TSBs (Technical Service Bulletins) or recalls that might apply to your specific VIN. Be prepared to provide your oil change history, as this can be important for warranty claims.
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