Most common 2018 BMW 330i problems
Share of the 32 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
BMW 330i complaints by model year
Best 330i years: 2010, 2011. Years to avoid: 2017, 2020, 2021, 2018, 2019. Compare all years →
2018 BMW 330i recalls (1)
Engine and engine cooling › Engine
BMW of North America, LLC (BMW) is recalling certain 2018 BMW 540d xDrive vehicles. The crankshaft sensor may be equipped with incorrect firmware, preventing the sensor from properly processing input from the crankshaft reluctor ring, possibly resulting in a vehicle stall.
Remedy: BMW will notify owners, and dealers will replace the crankshaft sensor, free of charge. The recall began September 6, 2018. Owners may contact BMW customer service at 1-800-525-7417.
NHTSA defect investigations
Federal safety investigators have looked into a possible defect involving the 2018 BMW 330i:
Desiccated Air Bag Inflator Rupture
From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited.
What 2018 BMW 330i owners say
Engine & cooling
On January 19, 2022 I was driving and then smoked filled inside my car and the outside engine was smoking and a light came on that said check coolant. BMW service took me in that day and they said my coolant broke. They removed it and replaced it. They did not understand how the coolant broke but I paid for the service and parts and moved forward. On November 25, 2022 I went into the same BMW service center to get a routine car service and they stated there was a recall and they would replace my coolant for free. (After I told them I paid for it ($699.63) . They insisted I replace it for free again and reach out to BMW corporate for a reimbursement of previous service. I received a call yesterday stating they would not replace it and reach out and file a report with NHTA.
The contact owns a 2018 BMW 330I. The contact stated that while driving at an undisclosed speed, unknown warning lights were suddenly illuminated, indicating that the engine was overheating. The message instructed the driver to shut off the vehicle immediately. The contact pulled over and turned off the vehicle, and it was discovered that the coolant reservoir was empty. The vehicle was towed to a local dealer, where it was determined that there was a plastic part from the oil cooler housing that needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 40,000.
Fuel & propulsion system
The contact owns a 2018 BMW 330I. The contact stated that while driving at various speeds, the engine overheating message was displayed on the instrument panel with the temperature gauge rising to hot(H). The vehicle was taken to an independent mechanic where the coolant reservoir was topped off however, the failure persisted. The contact then received notification of NHTSA Campaign Number: 21V907000 (Fuel System, Diesel) which was linked to the failure. The vehicle was taken to the dealer where the recall repair was performed. The contact stated that recently the vehicle began to leak coolant. The vehicle was taken back to the dealer and the contact was informed that the manifold needed to be taken off to perform a diagnostic test. The contact was informed that the oil filter housing unit and the water pump both needed to be replaced. …
On January 19, 2022 I was driving and then smoked filled inside my car and the outside engine was smoking and a light came on that said check coolant. BMW service took me in that day and they said my coolant broke. They removed it and replaced it. They did not understand how the coolant broke but I paid for the service and parts and moved forward. On November 25, 2022 I went into the same BMW service center to get a routine car service and they stated there was a recall and they would replace my coolant for free. (After I told them I paid for it ($699.63) . They insisted I replace it for free again and reach out to BMW corporate for a reimbursement of previous service. I received a call yesterday stating they would not replace it and reach out and file a report with NHTA.
Electrical system
The contact owned a 2018 BMW 330I. The vehicle was taken to a local dealer for a Manufacturers Recall: 0017150200 related to the Coolant Leak to be completed. The contact stated that after driving 7 miles to her home at 35 MPH, there was smoke coming from the engine compartment. All the warning lights illuminated. The vehicle was powered off and the smoke extinguished on its own. A fire report was not filed. There were no visible flames. The local dealer was called and the vehicle was towed back to the dealer where it was confirmed that the pressure test was not completed and there was no coolant in the vehicle. The dealer informed the caller that the struts needed to be replaced however the coolant failure was repaired. The vehicle was repaired for the coolant failure however the contact mentioned that the vehicle was not performing as designed. …
While driving on the highway, my vehicle unexpectedly caught fire due to no fault of my own. Upon investigation, it appears the fire originated from a short in the rear window defroster wiring, which led to significant damage in the right rear C-pillar area, headliner, rear window, and rear deck. This event was not only hazardous to my physical safety but also deeply traumatic on a personal level. As someone who suffered severe burns as a child, experiencing a fire while operating a vehicle triggered a powerful emotional response. The trauma of the incident has had a profound impact on my mental health and sense of safety. I have always trusted BMW for its engineering excellence and commitment to safety, which makes this situation even more disheartening because they refuse to fix my vehicle.
2018 BMW 330i engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 2.0L 4-cyl turbo | 8-speed automatic | RWD | 24 / 34 / 27 |
| 2.0L 4-cyl turbo | 6-speed manual | RWD | 21 / 32 / 25 |
EPA ratings. Class: Compact car.
Frequently asked questions
Is the 2018 BMW 330i a good car?
Based on 32 owner complaints filed with NHTSA, the 2018 330i rates avoid: 3.4× as many complaints as a typical year of the 330i at the same age. It is one of the 330i years we suggest avoiding. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2018 BMW 330i?
The engine & cooling — 14 complaints, 44% of all complaints for this model year. Next are the fuel & propulsion system (5) and electrical system (4).
How many recalls does the 2018 BMW 330i have?
There is 1 recall for the 2018 BMW 330i, the most recent from July 11, 2018 (engine). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the BMW 330i?
The best years by complaints, compared at the same age, are 2010 and 2011. Years to avoid or approach with caution: 2017, 2020, 2021, 2018 and 2019. See the full BMW 330i years comparison.
At what mileage do 2018 BMW 330i problems happen?
The median mileage reported in complaints is about 37,000 miles; 67% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.