Diamante (2003)
Reliability Score
Complaints by Engine Code
6G74
3.5L 6-cyl / 205 hpView details
Complaint Breakdown
Mitsubishi Diamante Unidentified Engine
View details
Complaint Breakdown
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.
What to check on a used 2003 Mitsubishi Diamante
On a used 2003 Mitsubishi Diamante, the systems with the most NHTSA owner complaints are the engine (17), the cooling system (17) and the brakes (5). 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 17 owner complaints on the 2003 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 17 owner complaints on the 2003 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 5 owner complaints on the 2003 Mitsubishi Diamante about the brakes.
- Measure the tread on all four tires, read the date codes and look at each wheel.Safety. NHTSA has 3 owner complaints on the 2003 Mitsubishi Diamante about the wheels and tires.
Recalls (2)
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.
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.
Alternatives in Compact Sedan
Frequently Asked Questions
What are the most common 2003-2003 Mitsubishi Diamante complaints?
Owners have filed 56 complaints with NHTSA about the 2003-2003 Mitsubishi Diamante. The systems they name most often are the engine, the cooling system and the brakes.
Is the 2003-2003 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 56 complaints with NHTSA about the 2003-2003 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 2003-2003 Mitsubishi Diamante have?
NHTSA has 56 owner complaints on file for the 2003-2003 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 2003-2003 Mitsubishi Diamante?
NHTSA lists 2 recalls covering some 2003-2003 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 2003 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. 56 complaints analyzed. Data confidence: moderate. Last updated: 2026-10-12.