1999 Mitsubishi Diamante problems & reliability
23 owner complaints filed with NHTSA for the 1999 Mitsubishi Diamante, alongside 2 safety recall campaigns. Last verified Aug 8, 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.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Visibility → | 10 | 43% |
| Engine and Engine Cooling | 3 | 13% |
| Suspension | 3 | 13% |
| Service Brakes, Hydraulic | 2 | 9% |
| Fuel System, Gasoline | 1 | 4% |
| Seat Belts | 1 | 4% |
| Seats | 1 | 4% |
| Service Brakes | 1 | 4% |
| Steering | 1 | 4% |
| Structure | 1 | 4% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
All 12 reported components →Complaints by incident year
What owners report
“"takata recall" I found the most recent recall on the page, https://driving-tests.org/vin-decoder/ when I try to know more about vin number was. I searched in google search. And that why I found this information. Thans a lot for your help. The vehicle was in motion.”
Service Brakes · filed Feb 5, 2019
“I own a mitsubishi diamante, 1999. I noticed fumes covering the passenger side windshield. In the winter time the problem is worse and it covers both passenger side and driver's side creating very dangerous driving conditions. *tr”
Engine and Engine Cooling · filed Jun 24, 2011
“Rear end unstable. Vehicle backend swerves and fishtails on wet or icy surfaces. Repair shop states back end is frozen and unable to align rear tires causing vehicle to swerve when driven on wet or icy surfaces. Misalignment of rear results in new tires having to be purchased approximately every 2-3 months. *tr”
Suspension · filed Dec 8, 2010
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Technical service bulletins
45 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 1999 Mitsubishi Diamante. The 10 most recent:
This Technical Service Bulletin was sent to dealers to explain the difference between normal dew condensation, which is a natural phenomenon, and water penetration caused by improper sealing or a defective/broken part.
TSB-22-54-003 · Service Bulletin/Repair Instructions · issued Apr 7, 2022
This is a service newsletter (Tech Talk) that was sent out to dealers.
TT253 · Service Bulletin/Repair Instructions · issued Nov 26, 2019
This is a Technical Service Bulletin sent to dealers. This bulletin supersedes TSB-18-00-003, issued April, 2018, to add updated information for Carrying Capacity Reduced Label.
TSB-19-00-008 · Service Bulletin/Repair Instructions · issued Jul 30, 2019
This is a service newsletter (Tech Talk) that was sent out to dealers.
TT237 · Service Bulletin/Repair Instructions · issued Feb 26, 2018
This is a service newsletter (Tech Talk) that was sent out to dealers.
TT218 · Service Bulletin/Repair Instructions · issued Aug 28, 2015
This TSB contains troubleshooting steps for diagnosis of various customer complaints relating to the audio system speakers in Mitsubishi vehicles equipped with original equipment audio components.
TSB-15-54-004 · Service Bulletin/Repair Instructions · issued Jul 29, 2015
This is a service newsletter (Tech Talk) that was sent out to dealers.
TT217 · Service Bulletin/Repair Instructions · issued Jul 22, 2015
This is an index of Tech Talk newsletter articles released in 2012.
TTIndex12 · Service Bulletin/Repair Instructions · issued Mar 5, 2013
This is a service newsletter (Tech Talk) that was sent out to dealers.
TT195 · Service Bulletin/Repair Instructions · issued Mar 5, 2013
This is a service newsletter (Tech Talk) that was sent out to dealers.
TT194 · Service Bulletin/Repair Instructions · issued Feb 6, 2013
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
The 1999 Mitsubishi Diamante has 2 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
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 1999 Mitsubishi Diamante?
- · 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.