Hyundai Sonata: Theta II 2.0T Rod Bearing Failure (NHTSA Recall)

The Theta II 2.0T engine (G4KF) used in the 2009–2014 Sonata is subject to a documented manufacturing defect where metal debris remains in oil passages, starving rod bearings of lubrication and causing failure. Hyundai issued an extended warranty and recall in multiple markets including AU/NZ under the global programme (NHTSA Campaign 17V226000). Engine seizure or sudden power loss can occur without warning, with fire risk in severe cases from oil contact with the exhaust. Any un-remediated Sonata 2.0T is a critical risk.

• Deep knocking or ticking from engine under load or acceleration
• Oil pressure warning light illuminating
• Sudden engine stall or loss of power without warning
• Burning oil smell or smoke from engine bay in severe cases

1. 1

   Verify whether a recall or extended warranty repair has been completed — request documentation showing engine inspection or replacement.

2. 2

   Listen carefully for any knocking at idle or under acceleration.

3. 3

   Check oil level and condition.

4. 4

   Scan for fault codes.

5. 5

   Any sign of bottom-end knock in a Theta II engine must be treated as critical — do not proceed without documented recall completion.

$7,000 to $16,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Has the Theta II recall or extended warranty engine inspection been completed?”
• “Do you have documentation showing the recall repair or engine replacement?”
• “Has the engine ever knocked, ticked, or lost oil pressure?”
• “What oil specification and change interval have been used throughout ownership?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.