2011 Kia Optima: engine knocking or ticking

Filed Jul 23, 2026 · Engine · FL

The vehicle's engine had previously been replaced once under Kia's Theta II engine recall/warranty program approximately five years prior to this incident. On the date of failure, the replacement engine catastrophically failed while the vehicle was in operation, resulting in the engine developing a hole in the engine block and becoming inoperable. Prior to the failure, the vehicle exhibited a "check engine" warning and symptoms consistent with connecting rod bearing failure. Diagnostic trouble codes P1326 and P0303 were present upon inspection at an authorized Kia dealership. The failure occurred at approximately 198,000 miles. This is the second engine failure on this vehicle, both consistent with the known Theta II engine defect involving premature bearing wear and connecting rod failure that has been the subject of prior the federal safety agency recalls and a related class action settlement. The failure created a risk of sudden loss of engine power while driving, which can pose a safety hazard in traffic. The vehicle was inspected by the authorized Kia dealership, which confirmed the hole in the engine block and the diagnostic codes noted above. The engine and related repair estimate are available for inspection upon request. A warranty claim for repair coverage was submitted and denied by the manufacturer, citing insufficient maintenance documentation, despite this being the vehicle's second occurrence of the same underlying defect.

Filed Apr 8, 2026 · Engine · GA

I am submitting a complaint regarding my 2011 Kia Optima (VIN: [XXX] ), which is currently experiencing significant engine issues and is undrivable. This issue is currently being reviewed under Kia Case #XXX. This vehicle is part of the Theta II engine group that has been the subject of recalls, service campaigns, and extended warranty coverage due to known engine defects, including rod bearing failure and potential engine seizure. The vehicle has also received the Knock Sensor Detection System (KSDS) update associated with these known issues. My vehicle is currently at the dealership and has been there since March 10, 2026. It is not drivable, and I have been without transportation during this time. The dealership has diagnosed the issue as oil consumption; however, Kia has denied coverage, stating that oil consumption is not related to rod bearing failure. Kia has not confirmed whether a full internal engine inspection was performed to rule out rod bearing damage, nor have they confirmed that a Techline engineering review has been conducted. Given the known history of engine defects in this model, I am concerned that the current condition may be related to internal engine failure that has not been properly evaluated. Oil consumption can be a precursor or symptom of internal engine damage, and I do not believe the issue has been fully or adequately diagnosed. Additionally, my vehicle has an open safety recall related to potential engine compartment fire risk, which further raises concerns about the safety and reliability of this vehicle. I am requesting that this issue be reviewed as a potential safety-related defect, as the vehicle is undrivable and may be at risk for sudden engine failure or fire. I am also concerned that the manufacturer is relying solely on a dealership-level assessment without a thorough engineering evaluation of a known defect condition. Thank you for your review of this matter. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jan 26, 2025 · Engine · CA

Engine is knocking with check engine ligh on. Kia has a recall on my car for metal shaving in the engine during manufacturing process. I took it to Kia dealer but they refused and said they wont cover it because it's a Salvage tile, and I thought Salvage tiles are covered if it's a a safety recall but they said it's not covered because Kia wont pay them for the repairs or the new engine.

Filed Apr 1, 2024 · Brakes, Engine · 157,000 miles · GA

The contact owns a 2011 Kia Optima. The contact stated that while driving at an undisclosed speed, she smelled smoke in the interior of the vehicle. The air bag and check engine warning lights were illuminated. The vehicle was taken to an independent mechanic, who diagnosed a failure with the knock sensor. The vehicle was not repaired. After investigating the failure, the contact related the failure to the federal safety agency Campaign Number:Â 23V652000 (Service Brakes, Hydraulic), and the VIN was included, but parts were not yet available. The manufacturer was not notified of the failure. The failure mileage was 157,000.

Filed Mar 24, 2024 · Engine · CA

On [XXX] while driving my oil light came on. Since I assumed I was low on oil, I proceeded to nearest gas station, approx 10 min.away, and added oil. I let engine remain off for approx.20 min. When I started the car up blue smoke began coming out from front and rear and there was a knocking noise. Since this is an engine that had already been replaced due to a recall, and now symptoms have returned I suspect engine might have failed again. I have always done my oil changes and have not had any issues. I had car towed towed to San Jose and contacted a mobile oil service to have oil drained out and replaced. When he was finished he said there were particles in oil removed and suspected engine had failed and I should not drive. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Dec 26, 2023 · Engine, Lights · NE

Check engine has failed. Glow relay stuck on or knock sensor or engine warranty. I don't know. Kia service will find out what's wrong with my car.

Filed Jul 31, 2023 · Engine · NE

I saw low battery due to fire risk or overheated cause of oil change. I don't know what's wrong with my car. Engine knocking bad if warranty coverage accepts. I hope safety recalls will be approved. Please help me!

Filed Jul 3, 2022 · Engine · AL

My 2011 Kia Optimas engine light started flashing and the car lost all power and had no RPMS over 1000-2000. I took it to the dealership where I was told it had a code P1326 and they replaced a knock sensor. The same day that I picked my car up from them I was going down the interstate and it shut completely off and wouldn’t crank. I had it towed back to the dealership where they said I would most likely need a new engine. A few days later they call and say the engine won’t be covered under the recall because of some hose they claim was leaking for the cooling system. They said it now had a blown head gasket which I’m not sure how because it never ran hot. This is absolutely ridiculous for customers to deal with so many delays and problems just to get the repairs on their vehicle that Kia has agreed to make. If my vehicle needed a knock sensor then obviously the damage to the motor is because of faulty manufacturing of parts and I shouldn’t have to pay for a new motor!

Filed Nov 27, 2021 · Acceleration, Engine · FL

On NOV. 26TH 2021, I was driving my car and upon trying to accelorate, my car felt as if it was about to stall out. I pressed the gas and I barely moved. My engine light went on immediately and it's constantly flashing now. The cars RPM's do not go past 1-1/2 RPM's. I can not pick up speed like before, like I should. My car now hesitates and I'm scared to drive it. I feel that it's dangerous cause I can not keep up with traffic. I found a RECALL letter that I have from July 12, 2017 in which I took it to the dealer at that time I received it. I alo found 2 other recall letters ( see pics ataached). I guess at that time when they checked it nothing was wrong BUT now I am having an issue and I feel it could be related. The recall number is: 17V224 follow up letter of one of the recalls. The recalls prior to that does not have a # on it: it states: ENGINE CONNECTING ROD on of the recalls. I'm hearing some knocking but it just happened and I havent driven it since Nov. 26th. a.m.The code that comes up as P1362, knocking sensor and can be a number of other things. And everything I read says the KNOCK sensor detects vibrations indicating an onset of excessive connecting rod bearing wear. and can severly damage the engine. I'm very concerned and I feel that this recall back in 2017 is now happening to my car. I have uploaded the recall I have in my possession. According to William Garcia( Billy ) the service guy I always usually worked with at Gunther Kia, all of my recalls were checked and soem weere fixed. These particualr ones he said were done and or checked but nothing was repaired as you'll see in my history of service on recalls with them.

Filed Apr 20, 2021 · Engine · 60,000 miles · TX

Tl* the contact owns a 2011 kia optima. The contact previously received notification the federal safety agency campaign number: 17v224000 (engine and engine cooling). The vehicle was taken to bert ogden mission kia (2307 e expressway 83, mission, tx 78572) where they inspected the vehicle and found no fault with the engine. The recall classification was then removed from the vehicle and the vehicle was returned to the contact. Months later, the contact stated that an abnormal knocking sound was coming from the engine. There was no warning light illuminated. The contact also stated that the knocking grew louder, and the vehicle would stall upon acceleration, without warning. The contact called the same dealer and was informed that they were unable to assist him since the recall was already serviced on the vehicle. The manufacturer was not notified of the failure. The vehicle was not yet repaired. The failure mileage was approximately 60,000.

Filed Mar 10, 2021 · Engine · 98,700 miles · WV

Code showing is p1326 - ksds - rod bearing wear. Engine light is flashing and vehicle has went into limp mode/loss of power.

Filed Feb 5, 2021 · Engine · 131,000 miles · NJ

Car started to knock shut off called tow truck.checked code said knock sensor replaced still knocks changed oil again after two months and found pieces of medal in oil that looks like bass and metal I was driving the car on road rt.322 in no