2003 Mitsubishi Diamante Fuel system Problems
- Complaints
- 2about this part
- Share
- 4%of 56 total for the year
- Median mileage
- 55,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 2 complaints about the fuel system of the 2003 Mitsubishi Diamante, 4% of the 56 complaints for this model year. Where a mileage was given, the median is 55,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I purchased a used 2003 Mitsubishi Diamante from bankston dodge in 2007. It was clean and ran well. There was an unusual odor inside, but smelled as if it could have been what the dealership used to clean the inside. It turned out to be anti-freeze. The vehicle had a heater core leak prior to our purchase. Recently the gas gauge has stopped working.”
NHTSA complaint #10276190, filed 2009-07, 50,000 miles“The contact owns a 2003 Mitsubishi Diamante. The contact stated the vehicle was consuming excessive amounts of fuel and she was concerned the vehicle would prematurely run out of fuel while driving. The vehicle was taken to an independent repair shop where the contact was told that the intake air temperature sensor would need to be replaced. The vehicle was not repaired. The failure mileage was 60,000 and the current mileage was 70,000.”
NHTSA complaint #10396889, filed 2011-04, 60,000 milesRelated service bulletins
- 10170071Jul 22, 2015This is a service newsletter (Tech Talk) that was sent out to dealers.
- 10170100Feb 6, 2013This is a service newsletter (Tech Talk) that was sent out to dealers.
- 10170097Jan 15, 2013This is a service newsletter (Tech Talk) that was sent out to dealers.
- 10170087Dec 7, 2012This is a service newsletter (Tech Talk) that was sent out to dealers.
Fuel system: other model years
Other parts of the 2003 Mitsubishi Diamante
28 complaintsEngine cooling
17 complaintsBrakes
5 complaintsTransmission and drivetrain
4 complaintsEquipment
3 complaintsSuspension
3 complaintsTires
3 complaintsElectrical system
2 complaintsAir bags
1 complaintsExterior lighting
1 complaintsLatches, locks and linkages
1 complaintsSeats
1 complaints
← All problems reported for the 2003 Mitsubishi Diamante
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.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology