1998 Mitsubishi Diamante Problems
- Complaints
- 27filed with NHTSA
- Median mileage
- 71,750miles, 12 complaints with mileage
- Recalls
- 1campaigns 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 / 23 hwy
Sources: NHTSA records for the 1998 Mitsubishi Diamante (complaints, recalls, investigations), EPA fuel economy. Report an error
NHTSA recorded 27 consumer complaints for the 1998 Mitsubishi Diamante. The part named most often is visibility, with 16 complaints (59% of the total), followed by brakes (3) and vehicle speed control (3). 12 of the complaints include a mileage, and 8% of those were filed for vehicles with under 50,000 miles; the median is 71,750 miles. Of all complaints, 1 involved a crash, 4 an injury, according to the filers. NHTSA lists 1 recall campaign 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 2 technical service bulletins filed under the same part.
Not compared (before 2008). Model years 2008–2023 of the same vehicle that have at least 25 complaints are compared, and a model needs at least 3 of them.
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 11%
- Electrical system2 7.4%
- Engine cooling1 3.7%
- Equipment1 3.7%
- Other or unknown1 3.7%
- Seat belts1 3.7%
- Steering1 3.7%
- Body and structure1 3.7%
Also reported: Tires (1), Wheels (1).
Example complaints
Visibility (wipers, defrost, mirrors): “The heater core has failed (once again) I am not sure of any company that has realeased their cars with such a major failure without taking some kind of responsibility to recall this item in the car. Nearly all of the heater cores from Mitsubishi diamantes that I have seen are all bad. Leaks onto the ecu and causes a whole heck load of problems. Please DOT have Mitsubishi recall this. …”
NHTSA complaint #10715681, filed 2015-05, 171,000 milesVehicle speed control: “We just cleared canadian customs at blaine wa, pacific crossing, and were accelerating to speed limit on I 5 freeway when the car accelerated to near 100 miles an hour. The tach at some point was 7500 and increasing. The accelerator was stuck and eventually we were able to get to the emergency lane area and turned of the ignition key. Full pressure on the brakes would not slow it down much. We were towed 21 miles to davis automotive in bellingham, wa, where a replacement throttle cable and associated structure was severely bent and the cable had cut thru it and stuck. …”
NHTSA complaint #10243812, filed 2008-09, 31,385 milesMileage when problems were reported
8% of the 12 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 56,231 and 91,000 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 1998 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 | 23 | 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…
Recall details for the 1998 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 1998 Mitsubishi Diamante have?
NHTSA recorded 27 consumer complaints for the 1998 Mitsubishi Diamante as of Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
What part of the 1998 Mitsubishi Diamante is reported most often?
Visibility is named most often, in 16 complaints (59% of the total), followed by brakes with 3.
Has the 1998 Mitsubishi Diamante been recalled?
NHTSA lists 1 recall campaign for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.
What gas mileage does the 1998 Mitsubishi Diamante get?
The EPA rates the 1998 Mitsubishi Diamante (Diamante, 3.5L 6-cyl) at 18 mpg combined, 16 city and 23 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 1998 Mitsubishi Diamante reported?
Among the 12 complaints that include a mileage, the median is 71,750 miles and the middle half falls between 56,231 and 91,000 miles; 8% 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.