2018 INFINITI Q50 owner complaints

Leak in the turbo causing oil to burn and create smoke from the exhaust

Turbos are starting to work and car is starting to consume anti freeze

The serpentine belt makes consistent noise in all types of weather. Already had the dealer replace it once. Noise came back and the dealer now says it could be the tensioner pulley.

From start into the warm-up, there is a consistent whoreling noise coming from the motor.

On 6/13/2020 the drive belt shredded while driving under 30mph, under light acceleration. At first, the battery light illuminated on the instrument cluster, followed the check engine light. White smoke began to come from the engine. Thankfully, I was nearby my house and made it there safely. Furthermore, the engine overheated due to a coolant hose being knocked off by the shredded belt. Additionally, the water pump and a/c compressor failed. The pulley tensioner assembly and belt were replaced under manufacturer's warranty, along with the aforementioned failed components. All work was done at grubbs Infiniti of grapevine, tx and the repair took exactly three weeks to fix. The failure mileage was 28,660. Previously, on march 6, 2019, Infiniti of van nuys, ca, tightened the pulley tensio

The serpentine belt on my 2018 Infiniti Q50 Sport became contaminated with oil immediately after dealer turbo replacement at the end of August 2025, causing the belt to slip, shred, and be pulled into the engine. This resulted in sudden loss of essential engine functions and poses a significant safety hazard. This failure was caused by improper repair at the dealership.”

Gas mileage is verry bad ! In city only my car give me 14 MPG and hwy 18mpg Infiniti say is. 20mpg city and 29hwy. And combined 22mpg

The phone/bluetooth constantly disconnect devices that are added to bluetooth. Often when calls are made from your cell through bluetooth, there is a frying/static sound that occurs. You have to hang up and place your call again. This happens both while driving and stationary.

I went to Evo Motors to find a car and found a car filled out an application and had to return to the next day because they were closing There was already talk about a down payment but no credit transaction was happening yet. I didn’t even have an offer on the credit yet so I came back the following day and on the way there I got a phone call that the bank was requesting a down payment in the amount of $4500. The salesperson was requesting cash downpayment and I thought that was strange since that was a lot of cash to have on hand. Me and girlfriend had a decent score to acquire the car but the dealer insisted on the cash downpayment and told us the bank was requested the down payment in order to get the car. I was very uncomfortable but I needed the car as I had lost my previous car

The Blindspot on my car needs a sensor to signal a cars presence. I have to turn my neck and head all way around to see which is unsafe for myself and others on the road.

The airbag/srs light is on. I've read on multiple forums that this is a common occurrence with this model and year of Infiniti. It did not come on as a result of any accident/incident.

Airbag light turn on, on my dashboard, I checked it with a professional OBD2 scanner and shows a code which indicates a fault in the Occupant Detection System (ODS), which the scanner says it is very common for my vehicle. This puts my passengers at risk due to an airbag system fault. My vehicle has not been in an accident, nor has my passenger seat been messed with. I have spoken to other individuals with the same vehicle, also checked the forums for my specific vehicle and almost all of them have the same issue with the ODS, with no recalls or warranty resolution from the dealership. This is a common issue. It is concerning because there is a pattern of the ODS being faulty by no fault of our own but no resolution or recall.

Within one month of purchase, the airbag warning light illuminated and has remained on continuously. A separate dealership later confirmed the airbag system is defective and may not deploy in an accident. This is a serious safety defect that was not disclosed to me at the time of sale. Additional Issues: •On July 14, 2025, I dropped the car off for prolonged starting issues. I was told the vehicle had six faulty fuel pumps/injectors. •I have not had possession of the car since July 14. •On August 30, 2025, I received an email from Nissan of Orange Park stating the car was “completed and ready.” When I called the next day, I was told the car was not at Nissan at all, but at Infiniti, with no clear repair status or timeline. Concern: This is a federal safety defect. I request NHTSA’s revie

The Air bag system on a 2018 Infiniti Q50 AWD is malfunctioning. I’d like to get it checked out especially if this could be a tentative recall issue for myself and other owners of the same vehicle. I feel very unsafe for my family and I because the system was never tampered with, yet the light used to go away randomly. Currently, the light is permanently on, and passenger airbag light states the system is off from deploying in case of an accident. This would mean that I would be driving at a risk of airbags being non-deployable and that is truly unsafe. This problem was not addressed with a dealer or any other service center. The vehicle has never been inspected yet, but it is a concern that I’d like to move forward on. The passenger airbag light is illuminated on my dashboard as well a

While I was driving my Infiniti on the highway my serpentine belt snapped 4 different times while in motion. All within one year. Including me getting my car back from the dealer and them letting me have it back that way. Also, the tires are horrendous, from day one, they pulled the car left or right on the car. All the settings were correct on the car. I wanted to have the tires replaced, by the manufacturer, and that can be done because no it's to long and everyone took to long to make things happen. Not to mention dunlop is impossible to get a hold of.

Run flat tires went flat on a pothole that was not even realized on a sunday with no service station open. Even if they were, the tire has to be replaced, cannot be repaired. There is no spare tire option- when contacted, company refused " not possible". This is not safe at all and must be addressed. Must have spare tire esp since run flat tires cannot be repaired and are not in stock at most service stations

Car comes with 19"rims and run flat tires (bridgestone drive guard). Since leasoing the car in november 2018, I have received 8 flat tires all from "potholes" that ripped the side wall. Consumer affairs says this tire should not be on this car in certain states in this case new york. Infiniti dealers do not offer an option and the unsuspecting consumer is left with a hazardous situation. Your eyes can leave the road as you search for even small potholes to avoid. When the tire does go flat and you are more than 25-50 miles away from a repair shop you are in danger of being stranded. I was stranded in a snowy wooded area and had to drive 25 miles in treacherous conditions with a child in the car just to find a replacement. The tire should not be on a car with a heavy front end per the tire

This was a rental vehicle, not my personal vehicle, but is applicable to multiple brands and models. The safety issue is due to the headlight modes. The default mode is off, yet the drl's remain on. These are bright enough that you can drive in the middle of the night and not realize that your actual headlights are off, which means that the tail lights are off. I have been seeing several vehicles every day with people driving with no lights on, even in poor visibility. The default should be for the headlights to be in auto mode or drl's must be off when you select off. I have been surprised several times this fall by drivers driving excessively slow with their lights off on the highway in the rain at night. You cannot see them till you are very close. All of them have these new LED

The contact's son owns a 2018 Infiniti Q50. The contact stated that soon after purchasing the vehicle, there was an abnormal screeching sound coming from the brakes while depressing the brake pedal. There was no warning light illuminated. The contact's son took the vehicle to an independent mechanic to have the brake pads and rotors replaced. However, less than one month after the replacement of the pads and rotors, there was an abnormal grinding sound coming from the front passenger’s side brakes. The mechanic was notified of the issue, and the contact was informed that the brake calipers might also need to be replaced. The contact stated that while driving at various speeds, the engine temperature gauge indicated that the engine was hot(H), with white smoke coming from the exhaust pipes

My car wouldnt start and when it did, it would start shaking and every time I accelerate, The speed wasnt going any faster but only the RPMs were