AI Damage1993 Lexus SC400: common problems
Owners of the 1993 Lexus SC400 filed 9 complaints with NHTSA, most often about exterior lighting and vehicle speed control. Details by component below, with sources.
Key figures
- Owner complaints
- 9
- involving a crash
- 4
What fails most often
- 1 Exterior lighting 22% of all complaints
- 2 Vehicle speed control 22% of all complaints
- 3 Air bags 11% of all complaints
- 4 Engine and cooling 11% of all complaints
- 5 Equipment 11% of all complaints
- 6 Powertrain 11% of all complaints
- 7 Service brakes 11% of all complaints
- 8 Tires 11% of all complaints
- Exterior lighting: 2 complaints (22% of all).
- Vehicle speed control: 2 complaints (22% of all), 2 of them with a crash reported by the owner.
- Air bags: 1 complaints (11% of all), 1 of them with a crash reported by the owner.
- Engine and cooling: 1 complaints (11% of all), 1 of them with a crash reported by the owner.
- Equipment: 1 complaints (11% of all).
Symptoms owners describe
How many of the 9 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Exterior lighting | 2 | 0 | 0 |
| Vehicle speed control | 2 | 2 | 0 |
| Air bags | 1 | 1 | 0 |
| Engine and cooling | 1 | 1 | 0 |
| Equipment | 1 | 0 | 0 |
| Powertrain | 1 | 1 | 0 |
| Service brakes | 1 | 0 | 0 |
| Tires | 1 | 0 | 0 |
| Other | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
Tl* the contact owned a 1993 lexus sc400. While driving at a low rate of speed, the contact depressed the brake pedal and crashed into a wall. The air bags deployed, which severely burned the contact's chin, lips, and neck. The air bag also burned parts of the contact's chest and torso area.
The transmission failed to drop down to neutral and/or the idle could not drop down to less than 1000 rpm. I realize it is an older vehicle and computer chips could fail due to age but I wonder if this could be a design flaw of the fail safe accelerator assembly.
Consumer was parking vehicle into a parking space when vehicle all of a sudden acceleratted for unknown reason, causing vehicle to rollover two other vehicles, which were damaged. Dealer/ manufacturer notified and informed that nothing could be found.
Vehicle suddenly accelerated to full speed while consumer was coming to a stop. Dealer has been contacted.
Tl* the contact owns a 1993 lexus sc400. The traction control logic program failed and caused loss of stopping power. The contact stated the rear brakes were dragging. The current and failure mileage was 112,000. The dealer has advised the contact that the traction control computer needed to be replaced.
Condensation developed over the right headlight. Consumer contacted the dealer, who stated they didn't know why this was happening .
I have had persistent mold and bad ordor coming from air conditioning system. I'm allergic to mold and other things at times it causes nausea, sore throat, headache and congestion.
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 11,366 of 36,656 model years in the NHTSA data (top 31% most complained about).
On average one model year of the SC400 has 5 complaints (12 years in the data). This year has 9, above average.
What to check before buying
- Exterior lighting. Headlamps, leveling, sensors and mounts after a frontal hit.
- Vehicle speed control. Accelerator pedal, cruise control, throttle codes.
- Air bags. Check the SRS light, stored codes and airbag/curtain status after any impact.
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
Other years of this model
Questions and answers
What are the most common problems with the 1993 Lexus SC400?
Owner complaints to NHTSA most often mention: exterior lighting, vehicle speed control, air bags. Total complaints: 9. The most frequent symptoms in complaint texts: A/C or heater (11%), headlights and tail lights (11%), unintended acceleration (11%).
How many service bulletins (TSB) were issued for the 1993 Lexus SC400?
NHTSA lists 0 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 1993 Lexus SC400 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 1993 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.