AI Damage2018 Toyota Mirai: common problems
Owners of the 2018 Toyota Mirai filed 2 complaints with NHTSA, most often about service brakes and forward collision avoidance. The maker issued 87 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 2
- Technical service bulletins (TSB)
- 87
What fails most often
- 1 Service brakes 50% of all complaints
- 2 Forward collision avoidance 50% of all complaints
- 3 Fuel/propulsion system 50% of all complaints
- Service brakes: 1 complaints (50% of all); manufacturer bulletins for this component: 4.
- Forward collision avoidance: 1 complaints (50% of all); manufacturer bulletins for this component: 1.
- Fuel/propulsion system: 1 complaints (50% of all).
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- petrol
- CVT
Drive: FWD
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Service brakes | 1 | 0 | 4 |
| Forward collision avoidance | 1 | 0 | 1 |
| Fuel/propulsion system | 1 | 0 | 0 |
| Equipment | 0 | 0 | 31 |
| Structure | 0 | 0 | 27 |
| Electrical system | 0 | 0 | 17 |
| Backover prevention | 0 | 0 | 7 |
| Engine and cooling | 0 | 0 | 5 |
| Air bags | 0 | 0 | 2 |
| Communication | 0 | 0 | 2 |
| Fuel system | 0 | 0 | 2 |
| Seats | 0 | 0 | 2 |
| Seat belts | 0 | 0 | 1 |
| Steering | 0 | 0 | 1 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
The vehicle relies on hydrogen fuel, but hydrogen stations in California are frequently unavailable or offline. Many stations are closed or out of fuel for extended periods. In addition, the price of hydrogen fuel has increased dramatically (approximately three times higher than when the vehicle was purchased).
On several occasions the Toyota Mirai would slam on the brakes on its own while at a considerable speed with no other cars around. It was very scary and concerning traveling at high speeds and the brakes being applied abruptly automatically.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 19,879 of 36,656 model years in the NHTSA data (among the 46% least complained about).
On average one model year of the Mirai has 3 complaints (11 years in the data). This year has 2, below average.
What to check before buying
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Forward collision avoidance. Radar and camera: calibration after bumper or windshield replacement.
- Fuel/propulsion system. Fuel smell, leaks, rough running, fuel-system codes.
- Structure. Rails, pillars, panel gaps, signs of pulling or welding.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- OBSOLETE NOTICE January 30, 2026
This bulletin is now obsolete. Please see T-SB-0001-26.
- Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System…
Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software.
- Some 2005 – 2026 Toyota vehicles that have undergone water intrusion may exhibit a condition in which a…
Some 2005 – 2026 Toyota vehicles that have undergone water intrusion may exhibit a condition in which a musty odor is present. Follow the procedures in this bulletin to remediate the odor and address this condition…
- The air conditioning dye injection tool kit has been developed to aid in identifying the location of air…
The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service Bulletin aid in locating, inspecting, and…
- Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System…
Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software…
- The condition known as acid rain is caused by airborne chemicals or particles in the atmosphere, which mix…
The condition known as acid rain is caused by airborne chemicals or particles in the atmosphere, which mix with rainwater, nighttime dew, or high humidity to form acidic compounds. If these contaminants settle and…
- To prevent brake rotor rust from forming during transportation and storage, wheel film will be used…
To prevent brake rotor rust from forming during transportation and storage, wheel film will be used instead of a cardboard type of anti-rust cover. The purpose of the wheel film is to shield the disc brake rotor from…
- Acid rain results from rainwater or other airborne moisture that become acidic due to industrial chemical…
Acid rain results from rainwater or other airborne moisture that become acidic due to industrial chemical impurities in the atmosphere. If these acidic compounds settle on an exposed vehicle, especially the horizontal…
- Toyota vehicles are currently protected with RapgardTM protective film designed to protect the horizontal…
Toyota vehicles are currently protected with RapgardTM protective film designed to protect the horizontal painted surfaces. This material protects from acid rain, environmental fallout, and rail contamination. Follow…
- Vehicles may occasionally be subjected to contamination by airborne iron particles shed from railroad…
Vehicles may occasionally be subjected to contamination by airborne iron particles shed from railroad tracks, train wheels, exposure to heavy machinery facilities, grinding, welding, etc. This type of contamination can…
- Some 2005 – 2024 Toyota vehicles that have undergone water intrusion may exhibit a condition in which a…
Some 2005 – 2024 Toyota vehicles that have undergone water intrusion may exhibit a condition in which a musty odor is present. Follow the procedures in this bulletin to remediate the odor and address this condition…
- Toyota vehicles are currently protected with RapgardTM protective film designed to protect the horizontal…
Toyota vehicles are currently protected with RapgardTM protective film designed to protect the horizontal painted surfaces. This material protects from acid rain, environmental fallout, and rail contamination.
NHTSA lists 87 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2018 Toyota Mirai?
Owner complaints to NHTSA most often mention: service brakes, forward collision avoidance, fuel/propulsion system. Total complaints: 2. The most frequent symptoms in complaint texts: brakes on its own (phantom braking) (50%).
How many service bulletins (TSB) were issued for the 2018 Toyota Mirai?
NHTSA lists 87 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2018 Toyota Mirai from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2018 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-05.