Engine failure?

2017 HYUNDAI SONATA
138,458 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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SELRUF84
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I own the vehicle listed above SE. When I purchased the vehicle, it had 109,000 miles which is a lot for a vehicle that was purchased in 2021. 25 days after I drove my car off the lot, I started to experience A loss of power that would prevent my car from accelerating past 40 MPH. I had my car towed to the dealership and I was denied a new engine to be installed, if anyone is aware of the Theta engine class action lawsuit that happened in 2019. My car should have had a new engine installed. Instead, a used engine was installed, and I was told that my car did not qualify for a new engine because the number four cylinder having low compression had nothing to do with the rod bearings. I was informed by a few different people that the number four-cylinder having low compression ties to rod bearings and the short and long block. I still continue to have the same issue today of the loss of power, stalling of vehicle while driving poor fuel economy, and knocking noises from the engine. Could I be having the same issue?
Dec 4, 2024 at 10:23 AM
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STRAILER
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Yes, it looks like you got the bad engine. The lawsuit focused on manufacturing defects in Hyundai's Theta II engines, particularly with metal debris in the oil passages and bearing wear. I would call the Hyundai customer service line to see what they can do.

1 (800) 633-5151

Let us know how it goes.
Dec 4, 2024 at 11:43 AM
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SELRUF84
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Hi Ken L,

Thank you for getting back to me.
The attorney handling the first Theta Engine lawsuit has requested a diagnosis of the rod bearing failure. Unfortunately, I only have the documentation provided to me when the engine was replaced with a used one in 2021. I have attached the receipt from the dealership for your reference.
Hyundai Motor America informed me that the low compression in the #4 cylinder did not qualify my vehicle for a new engine replacement. Furthermore, my car did not qualify for a warranty due to its high mileage.
I'm not sure how I will be able to obtain any documentation that would prove that the #4 cylinder is part of the qualified engine failure.
Dec 4, 2024 at 1:11 PM
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STRAILER
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Yep, the O'l dealer loophole. I don't know if you can get them to replace the engine with these kinds of restrictions. Sorry about that, at least you tried. Let me know if I can help with anything else.
Dec 5, 2024 at 1:05 PM