2001 Mitsubishi Diamante Reliability Score: 6.5 out of 10

78 NHTSA Complaints

2 Recalls

0 Fire Reports

0 Crash Reports

Reliability Score

6.5 / 10

Reliability score

About as many owner complaints as similar compact sedans

The class average is 7.0. Based on complaints owners filed with NHTSA about the engine, transmission or drivetrain.

Owners filed 17 powertrain complaints. A typical compact sedan fleet of this size and age would have drawn about 12.

Scores this low have often eased: the three years after looked about 0.8 points better in the typical case.

Breakdown

Complaints overall17 complaints against about 12 for similar vehicles

6.5

Last three years

n/aNot enough data

Engine, transmission or drive unit failed or replaced

n/aNot enough data

Oil consumption, fuel in the oil or overheating

n/aNot enough data

Each line scores one view of the same complaints the same way, so the lines overlap. The mark on each bar is the class average. A line needs 20 expected complaints to show a number.

Similar vehicles are others in the same class, compared at the same age and in the same years. The score counts complaints owners filed with NHTSA, per vehicle built, which is different from the share of vehicles that fail. How the score is worked out

On the record

No serious powertrain recall covering 5% or more of this generation and no escalated investigation in NHTSA's files. Warranty extensions and settlements have not been researched.

Complaints by Engine Code

6G74

3.5L 6-cyl / 205 hp

56 complaints 56.0 per year Gasoline

View details

Complaint Breakdown

other

engine

cooling

brakes

transmission

Same engine used in

MITSUBISHI Lancer (2002-2007)

Mitsubishi Diamante Unidentified Engine

22 complaints 22.0 per year

View details

Complaint Breakdown

other

engine

cooling

transmission

wheels tires

Owner Complaints by System

Complaints owners filed with NHTSA about the Mitsubishi Diamante, counted across every engine. A complaint can name more than one system.

Engine: 14 owner complaints

Cooling System: 14 owner complaints

What to check on a used 2001 Mitsubishi Diamante

On a used 2001 Mitsubishi Diamante, the systems with the most NHTSA owner complaints are the engine (14), the cooling system (14) and the brakes (4). Each one has an inspection step below, with counts as of 2026-10-12. A complaint is an owner report, not a confirmed defect, and counts rise with sales.

Start the engine cold and listen for the first 30 seconds, then again at idle once it is warm.Costly repair. NHTSA has 14 owner complaints on the 2001 Mitsubishi Diamante about the engine.
With the engine cold, check the coolant level and color, then watch the temperature gauge on the drive.Costly repair. NHTSA has 14 owner complaints on the 2001 Mitsubishi Diamante about the cooling system.
On an empty road, brake firmly from 40 mph with a light grip on the wheel.Safety. NHTSA has 4 owner complaints on the 2001 Mitsubishi Diamante about the brakes.
Accelerate gently through every gear, then once at full throttle. Shift into Reverse and back to Drive.Costly repair. NHTSA has 4 owner complaints on the 2001 Mitsubishi Diamante about the transmission and drivetrain.

Open the full inspection checklist for the 2001 Mitsubishi Diamante

Recalls (2)

04V428000Sep 1, 2004cosmetic

Equipment

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 THE SIZE REQUIREMENTS OF THE STANDARD.

04V067000Feb 11, 2004serious

Equipment

CERTAIN SPORT UTILITY AND PASSENGER VEHICLES FAIL TO COMPLY WITH FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 225, "CHILD RESTRAINT ANCHORAGE SYSTEMS." THE OWNER'S MANUAL DOES NOT CONTAIN A STEP-BY-STEP DESCRIPTION FOR HEADREST ADJUSTMENT WHEN INSTALLING A CHILD RESTRAINT SYSTEM (CRS) TETHER STRAP.

All Generations

20002000 20012001 20022002 20032003

Alternatives in Compact Sedan

2 engines / 1,030 complaints

3 engines / 16 complaints

3 engines / 66 complaints

Lexus

2014-2025

9.5/10

5 engines / 177 complaints

4 engines / 109 complaints

3 engines / 36 complaints

Frequently Asked Questions

What are the most common 2001-2001 Mitsubishi Diamante complaints?

Owners have filed 78 complaints with NHTSA about the 2001-2001 Mitsubishi Diamante. The systems they name most often are the engine, the cooling system and the brakes.

Is the 2001-2001 Mitsubishi Diamante a good used car?

That depends on the model year, the mileage and the maintenance history of the car in front of you. Owners have filed 78 complaints with NHTSA about the 2001-2001 Mitsubishi Diamante. Check which systems they name most often and whether a recall is still open on that car.

How many NHTSA complaints does the 2001-2001 Mitsubishi Diamante have?

NHTSA has 78 owner complaints on file for the 2001-2001 Mitsubishi Diamante as of the latest data pull. A complaint is an owner's report, not a confirmed defect, and counts rise with sales.

What recalls affect the 2001-2001 Mitsubishi Diamante?

NHTSA lists 2 recalls covering some 2001-2001 Mitsubishi Diamante vehicles. Which ones apply depends on the VIN: enter it at nhtsa.gov/recalls to see the open campaigns on a specific car.

What should I check before buying a used Mitsubishi Diamante?

Run the VIN through NHTSA's recall lookup and confirm every open recall has been done. Look hardest at the engine, the cooling system and the brakes, the systems owners complain about most. Ask for maintenance records, have an independent mechanic inspect the car and run a vehicle history report for prior accidents and title issues.

Does the Diamante have NHTSA crash test ratings?

NHTSA has not published crash test ratings for the 2001 Mitsubishi Diamante. Not all vehicles are tested each year. For the latest NHTSA safety information, visit nhtsa.gov/ratings.

Data from NHTSA federal complaints database. 78 complaints analyzed. Data confidence: moderate. Last updated: 2026-10-12.