1999 Mitsubishi Diamante Problems
- Complaints
- 23filed with NHTSA
- Median mileage
- 86,450miles, 12 complaints with mileage
- Recalls
- 2campaigns on record
- Trend
- StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.
- NHTSA crash rating
- —overall rating starts with 2011 models
- EPA fuel economy
- 18 mpgcombined, 3.5L 6-cyl FWD · 16 city / 22 hwy
Sources: NHTSA records for the 1999 Mitsubishi Diamante (complaints, recalls, investigations), EPA fuel economy. Report an error
NHTSA recorded 23 consumer complaints for the 1999 Mitsubishi Diamante. The part named most often is visibility, with 11 complaints (48% of the total), followed by brakes (3) and engine cooling (3). 12 of the complaints include a mileage, and 0% of those were filed for vehicles with under 50,000 miles; the median is 86,450 miles. NHTSA lists 2 recall campaigns and 16 technical service bulletins for this model year. Visibility complaints overlap with 2 technical service bulletins filed under the same part. Brakes complaints overlap with 1 recall campaign covering the hydraulic and 2 technical service bulletins filed under the same part.
This model year has fewer than 25 complaints on record, so the numbers below can change a lot with a few new reports.
Which parts are reported most
Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.
- Brakes3 13%
- Engine cooling3 13%
- Suspension3 13%
- Fuel system1 4.3%
- Seat belts1 4.3%
- Seats1 4.3%
- Steering1 4.3%
- Body and structure1 4.3%
- Tires1 4.3%
Example complaints
Visibility (wipers, defrost, mirrors): “The windows fog up so bad that it becomes hard to see. The vents spew out the pungent smell of anti-freeze. I have noticed on more than a few occasions that puffs of vapor shoot out from under the passenger side dash and vents. I know that anti-freeze is poisonous to humans and don't think that its safe for me to be driving the vehicle when I have to breath in the vapors.”
NHTSA complaint #10160835, filed 2006-06, 60,000 milesBrakes: “Rotors warped at 14444 miles, dealer turned them under warranty. They got warped again at 18700 mile, but dealer refused to address the issue, citing driver's driving habits.”
NHTSA complaint #746949, filed 2001-06Engine cooling: “I started to notice an odd smell in the vehicle and noticed a lack of coolant in the reservoir tank. After a few weeks I realized there was coolant accumulating on the passenger side floorwell. My vehicle is at 53,500 miles and was diagnosed by the dealer as having a heater core failure. The estimate they gave is $1,300 to repair. I cannot afford it so it looks like my vehicle will be garaged until a recall is issued.”
NHTSA complaint #10116609, filed 2005-04, 52,500 milesSuspension: “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.”
NHTSA complaint #10369585, filed 2010-12, 210,500 milesMileage when problems were reported
0% of the 12 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 70,000 and 102,590 miles.
Complaints by year filed
Trend: stable. Complaints filed in the last 3 full calendar years are within 25% of the 3 years before.
Fuel economy and running cost
EPA ratings for each 1999 Mitsubishi Diamante version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).
| Version | Engine | Transmission | City | Hwy | Comb. | Fuel / yr |
|---|---|---|---|---|---|---|
| Diamante FWD | 3.5L 6-cyl | 4-speed automatic | 16 | 22 | 18 | $4,550 |
Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.
Recalls and investigations
- 04V428000Sep 1, 2004Equipment › Other › LabelsCovers: Mitsubishi Diamante 1998–2004, Eclipse 1998–2005, Montero 1998–2004 +9 more
Certain passenger vehicles fail to conform to the requirements of federal motor vehicle safety standard no. 208, 'occupant crash protection.' the bilingual english/spanish removable air bag warning labels affixed to the dash and to the sunvisor do not meet…
- 00V132000May 8, 2000Parking brake › Driveline › HydraulicCovers: Mitsubishi Diamante 1999–2000
Vehicle description: passenger vehicles. The head of the screw that holds the retaining clip for the parking brake shoe can become brittle and break off.
Recall details for the 1999 Mitsubishi Diamante → · Check a VIN at nhtsa.gov/recalls
Technical service bulletins
TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 16 on record; the latest 10 are shown.
- 10211530Apr 7, 2022Other or unknown, Exterior lighting. 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…
- 10169006Nov 26, 2019Equipment. This is a service newsletter (Tech Talk) that was sent out to dealers.
- 10163703Jul 30, 2019Equipment. 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.
- 10130469Feb 26, 2018Equipment. This is a service newsletter (Tech Talk) that was sent out to dealers.
- 10170074Aug 28, 2015Transmission and drivetrain, Wheels, Engine cooling…. This is a service newsletter (Tech Talk) that was sent out to dealers.
- 10170070Jul 29, 2015Equipment. 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.
- 10170071Jul 22, 2015Transmission and drivetrain, Fuel system, Suspension…. This is a service newsletter (Tech Talk) that was sent out to dealers.
- 10170099Mar 5, 2013Equipment. This is an index of Tech Talk newsletter articles released in 2012.
- 10170096Mar 5, 2013Wheels, Transmission and drivetrain, Steering, Electrical…. This is a service newsletter (Tech Talk) that was sent out to dealers.
- 10170100Feb 6, 2013Fuel system, Electrical system, Transmission and…. This is a service newsletter (Tech Talk) that was sent out to dealers.
Other model years of the Mitsubishi Diamante
| Year | Complaints | Median mi | Recalls | Crash ★ | MPG | Score (50 = typical) | Trend |
|---|---|---|---|---|---|---|---|
| 2003 | 56 | 57,500 | 2 | — | 18 | Not compared (before 2008) | Stable |
| 2002 | 123 | 60,000 | 3 | — | 18 | Not compared (before 2008) | Stable |
| 2001 | 78 | 59,750 | 2 | — | 18 | Not compared (before 2008) | Stable |
| 2000 | 51 | 57,171 | 3 | — | 18 | Not compared (before 2008) | Stable |
| 1999 | 23 | 86,450 | 2 | — | 18 | — | Stable |
| 1998 | 27 | 71,750 | 1 | — | 18 | Not compared (before 2008) | Stable |
| 1997 | 34 | 111,566 | 0 | — | 19 | Not compared (before 2008) | Stable |
| 1995 | 12 | 137,500 | 0 | — | 19 | — | Not enough data |
| 1994 | 27 | 50,015 | 2 | — | 19 | Not compared (before 2008) | Stable |
| 1993 | 29 | 108 | 3 | — | 18 | Not compared (before 2008) | Stable |
| 1992 | 42 | 120,000 | 2 | — | 19 | Not compared (before 2008) | Stable |
All Mitsubishi Diamante model years · Best and worst years by complaints
Frequently asked questions
How many NHTSA complaints does the 1999 Mitsubishi Diamante have?
NHTSA recorded 23 consumer complaints for the 1999 Mitsubishi Diamante as of Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
What part of the 1999 Mitsubishi Diamante is reported most often?
Visibility is named most often, in 11 complaints (48% of the total), followed by brakes with 3.
Has the 1999 Mitsubishi Diamante been recalled?
NHTSA lists 2 recall campaigns for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.
What gas mileage does the 1999 Mitsubishi Diamante get?
The EPA rates the 1999 Mitsubishi Diamante (Diamante, 3.5L 6-cyl) at 18 mpg combined, 16 city and 22 highway, with an estimated annual fuel cost of $4,550 at 15,000 miles a year. Other engine and drive versions are rated differently.
At what mileage are problems with the 1999 Mitsubishi Diamante reported?
Among the 12 complaints that include a mileage, the median is 86,450 miles and the middle half falls between 70,000 and 102,590 miles; 0% were filed for vehicles with under 50,000 miles.
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Fuel economy is from the EPA and DOE (fueleconomy.gov).
Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.