MotorDeets

2003 Mitsubishi Diamante: Recalls, Problems & MPG

Here are the deets on the 2003 Mitsubishi Diamante: 2 recalls, 56 owner complaints and up to 18 mpg combined.

2vehicle recalls
56owner complaints
1mention a crash
18best combined mpg
2003 Mitsubishi Diamante
Photo: IFCAR · Public domain · Wikimedia Commons. Representative photo of this generation; trim may differ.

Recalls

2 vehicle recalls from the manufacturer. Repairs are free. Check your VIN to see if one is still open on your car.

Equipment Vehicle recall #04V067000 · 2004 · 134,000 vehicles

What's wrong: 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.

Why it matters: If the tether strap is improperly installed to the tether anchor, the child safety seat May not be sufficient restrained. In the event of a crash, the child could be injured.

The fix: A letter outlining the problem will be sent to owners along with a sticker containing the correct instructions as well as instructions on where to affix the sticker in the owner's manual. The recall began on March 29, 2004. Owners should contact Mitsubishi at 1-888-648-7820.

Equipment Vehicle recall #04V428000 · 2004 · 100,432 vehicles

What's wrong: 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.

Why it matters: This does not meet the requirements of the standard.

The fix: Mitsubishi caribbean will mail a customer notification letter containing a written description and a graphic of the bi-lingual dashboard air bag warning label. In addition, all current 2000-2004 nativa owners will also receive replacement air bag alert labels for the sun visors. This recall is…

Most-reported problems

Owner complaints filed with NHTSA, by component. One complaint can list several components. 0 mention a fire, 1 injuries and 0 deaths were reported.

Visibility (wipers, glass)28
Engine & cooling17
Brakes (hydraulic)4
Transmission & drivetrain4
Tires3
Suspension3
Equipment3
Electrical2

What owners describe

The 2003 Mitsubishi Diamante has 56 owner complaints, ranking #3 of 12 Diamante model years for complaints (about average; the typical year has 42). Complaints peaked in 2007 (17 filed that year). The typical problem showed up when the car was about 4 years old, at a median of 57,500 miles. Neighboring years: 2002 (123 complaints, 3 recalls), 2004 (3 complaints, 1 recalls).

Engines & fuel economy (EPA)

EngineTransmissionDriveCityHwyComb.Fuel
3.5 L 6-cylAutomatic 4-spdFront-Wheel Drive162318Premium

Want the full repair deets? Get the factory manual.

Recall and complaint data tells you what goes wrong. A service manual tells you how to fix it: torque specs, wiring diagrams, fluid capacities and step-by-step procedures for the 2003 Mitsubishi Diamante.

eManualOnline Download (PDF), keep forever

Closest thing to the factory manual for most years. Pay once, keep it.

Most $25–$78, one-time
Check 2003 Mitsubishi Diamante manual
Mitchell 1 DIY Online access, factory-level data

Pro-shop repair procedures, wiring diagrams and TSBs for your exact car.

From $19.99/mo · $39.99/yr
Check 2003 Mitsubishi Diamante manual
ALLDATAdiy Online access, factory OEM info

OEM procedures, specs and recall/TSB info, the same source many shops use.

From $19.99/mo · $59.99/yr
Check 2003 Mitsubishi Diamante manual
Haynes Print book or AllAccess online

Step-by-step photos written from a real teardown. Great for first-timers.

Books ~$30–$40 · AllAccess $34.99/mo
Check 2003 Mitsubishi Diamante manual

Heads up: we may earn a commission if you buy through these links, at no extra cost to you. Prices checked 2026-10 and can change. We never host or link to pirated manuals. Disclosure

FAQ

Does the 2003 Mitsubishi Diamante have any recalls?

Yes. NHTSA lists 2 vehicle recalls for the 2003 Mitsubishi Diamante. Recall repairs are free at any dealer, no matter how old the car is. Check your VIN at nhtsa.gov/recalls.

What are the most common 2003 Mitsubishi Diamante problems?

Owners have filed 56 complaints with NHTSA. The most-reported areas are visibility (wipers, glass) (28), engine & cooling (17), brakes (hydraulic) (4).

What gas mileage does the 2003 Mitsubishi Diamante get?

EPA ratings run up to 18 mpg combined (3.5 L, Automatic 4-spd), across 1 engine and transmission combos.

Where can I get a 2003 Mitsubishi Diamante repair manual?

eManualOnline sells downloadable manuals, Mitchell 1 DIY and ALLDATAdiy sell online access to factory repair data, and Haynes sells printed guides and online access. Pick a download if you want to keep it, or a subscription for wiring diagrams and TSBs.

Other Diamante years

199219931994199519971998199920002001200220032004