1992 Mitsubishi Diamante problems & reliability
42 owner complaints filed with NHTSA for the 1992 Mitsubishi Diamante. 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.
2 complaints report injuries (2 injured).
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Engine and Engine Cooling → | 11 | 26% |
| Service Brakes, Hydraulic | 7 | 17% |
| Air Bags | 6 | 14% |
| Electrical System | 6 | 14% |
| Suspension | 5 | 12% |
| Power Train | 4 | 10% |
| Seat Belts | 4 | 10% |
| Visibility | 4 | 10% |
| Equipment | 2 | 5% |
| Steering | 2 | 5% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
All 14 reported components →Complaints by incident year
What owners report
“Mitsubishi has produced 3.0 liter v6 engines from about 1990 through 1996 that exhibit chronic exhasut valve guide function deteroriation after approximately 60,000 miles. This results in heavy oil consumption and eventual engine failure.*ak this engine was utilized in the mitsubishi diamianti, 3000gt, dodge caravan…”
Engine and Engine Cooling · filed Dec 1, 2003
“Hello and thanks first of all for your time, until july 5th of 1999 I truely enjoyed my car. I was driving on i57 on july 5th at 65 mph and my car suddenly lost power. I having roadside service called from my cell phone a tow truck. The tow truck driver arrived who was also a repair person and also owner of the repair…”
Engine and Engine Cooling · filed May 31, 2002
“Consumer states the front and rear engine seal and piston rings are inoperative, the vehicle smokes excessively.*jb”
Engine and Engine Cooling · filed Oct 16, 2001
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Technical service bulletins
14 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 1992 Mitsubishi Diamante. The 10 most recent:
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 Technical Service Bulletin updates the door adjustment procedure in the Body Section of the applicable service manuals.
TSB-13-42A-002 · Service Bulletin/Repair Instructions · issued Jan 29, 2013
Mmsa has determined that under certain conditions, the front lower brake hoses may develop a crack, causing a loss of brake fluid. *tt
96V143 · Service Bulletin/Repair Instructions · issued Aug 28, 1998
Information about improved automatic transaxle end clutch. *tt
TSB9723015 · Service Bulletin/Repair Instructions · issued Dec 1, 1997
Information containing additional glass antenna cautions and inspection procedures. *yc
97110154013 · Service Bulletin/Repair Instructions · issued Nov 1, 1997
Service manual revision on supplemental restraint system (srs) cautions and warnings. *yc
97090152B003 · Service Bulletin/Repair Instructions · issued Sep 1, 1997
Mut-ii scan tool warranty. *tw
TSB9700005 · Service Bulletin/Repair Instructions · issued Jun 1, 1997
Throttle body procedures - service manual revision. *tw
TSB9711006 · Service Bulletin/Repair Instructions · issued May 1, 1997
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 1992 Mitsubishi Diamante 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 1992 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.