1991 Lexus LS400 problems & reliability
21 owner complaints filed with NHTSA for the 1991 Lexus LS400. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
3 complaints report injuries (5 injured).
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Service Brakes, Hydraulic | 5 | 24% |
| Air Bags | 3 | 14% |
| Unknown OR Other | 3 | 14% |
| Engine and Engine Cooling | 2 | 10% |
| Steering | 2 | 10% |
| Tires | 2 | 10% |
| Vehicle Speed Control | 2 | 10% |
| Wheels | 2 | 10% |
| Electrical System | 1 | 5% |
| Fuel/propulsion System | 1 | 5% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
All 13 reported components →Complaints by incident year
What owners report
“This lexus ls400 caught on fire during smog check and both new catalytic converters were on fire and 2 fire extinguishers were used. The car is still drive-able and only take very short short "stop and go" trips if you really want it go from point a to b. I have attached 2 pics on the smog check place and a report…”
Unknown OR Other · filed Dec 31, 2016
“Tl* the contact owns a 1991 lexus ls 400. The contact was exiting a parking space when the brake pedal was depressed into the floorboard abnormally. In addition, the contact noticed that brake fluid was leaking from the vehicle. The vehicle was at local repair shop where it was diagnosed that the brake lines were…”
Service Brakes, Hydraulic · filed Jul 15, 2011
“Its well known that the power steering/alternator setup on the 1990-1994 lexus ls400s are poorly designed. The power steering pumps are known to spring leaks. They are located directly over the alternator charging system and the leaking fluid shorts out the alternator, leading to failure. I have had two of these and…”
Steering · filed Dec 29, 2008
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Technical service bulletins
25 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 1991 Lexus LS400. The 10 most recent:
Lexus Safety Recall and Service Campaign - Technician Certification Requirements 4.13.2022
Safety Recall 22 · Service Bulletin/Repair Instructions · issued Apr 13, 2022
POL: This consolidated Tire Warranty Guide contains the complete warranty terms for all brands of ground and spare tires currently in use by Lexus. This information must be kept near the point of vehicle sale and be…
Lexus PRO19-02 - · Service Bulletin/Repair Instructions · issued Jan 12, 2022
Safety Recall and Service Campaign - Technician Certification Requirements
Lexus Safety Re · Service Bulletin/Repair Instructions · issued May 1, 2020
TSB: OBSOLETE NOTICE April 06, 2020: This bulletin is now obsolete. Please see L-SB-0008-20. Replacement Certification Labels and VIN Plates
L-SB-0179-17 Obs · Service Bulletin/Repair Instructions · issued Apr 6, 2020
TSB: SUPERSESSION NOTICE The information contained in this bulletin supersedes Service Bulletin Nos. L-SB-0048-08, PG007-07, PG016-01, PG015-01, PG004-97, PG003-97, PG003-93, PG002-90, L-SB-0048-08, PG007-07, PG016-01…
L-SB-0008-20 · Service Bulletin/Repair Instructions · issued Apr 6, 2020
TSB: Replacement Certification Labels. OBSOLETE NOTICE November 28, 2017: This bulletin is now obsolete. Please see L-SB-0179-17.
L-SB-0048-08 Obs · Service Bulletin/Repair Instructions · issued Dec 5, 2017
LSB: When servicing interior electrical switches and components, please note the precautions in this bulletin to avoid damaging electrical components and switches. Many lubricants, cleaners, and automotive chemicals…
L-SB-0066-11 Rev · Service Bulletin/Repair Instructions · issued Apr 10, 2015
LSB: When servicing interior electrical switches and components, please note the precautions in this bulletin to avoid damaging electrical components and switches. Many lubricants, cleaners, and automotive chemicals…
L-SB-0066-11 Rev · Service Bulletin/Repair Instructions · issued Apr 10, 2015
Auto matic Transmission Replacement kPrecautions
LSB008214 · Service Bulletin/Repair Instructions · issued Oct 16, 2014
TSB: OBSOLETE NOTICE-October 16, 2014: This bulletin is now obsolete. Please see L-SB-0082-14.
L-SB-0041-11 Rev · Service Bulletin/Repair Instructions · issued Oct 16, 2014
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
No NHTSA recall campaigns name the 1991 Lexus LS400 in our current data. Recalls may apply only to certain VIN ranges — always confirm with a VIN check.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 1991 Lexus LS400?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.