2004 Mitsubishi Diamante: Recalls, Problems & MPG
Here are the deets on the 2004 Mitsubishi Diamante: 1 recall, 3 owner complaints and up to 18 mpg combined.

Recalls
1 vehicle recall from the manufacturer. Repairs are free. Check your VIN to see if one is still open on your car.
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, 0 injuries and 0 deaths were reported.
What owners describe
- Transmission & drivetrain (3): the most common themes are stalls / loses power (2).
The 2004 Mitsubishi Diamante has 3 owner complaints, ranking #12 of 12 Diamante model years for complaints (well below the 42 average). Neighboring years: 2003 (56 complaints, 2 recalls).
Engines & fuel economy (EPA)
| Engine | Transmission | Drive | City | Hwy | Comb. | Fuel |
|---|---|---|---|---|---|---|
| 3.5 L 6-cyl | Automatic 4-spd | Front-Wheel Drive | 15 | 23 | 18 | Premium |
| 3.5 L 6-cyl | Automatic (S4) | Front-Wheel Drive | 15 | 23 | 18 | Premium |
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 2004 Mitsubishi Diamante.
Closest thing to the factory manual for most years. Pay once, keep it.
Most $25–$78, one-timePro-shop repair procedures, wiring diagrams and TSBs for your exact car.
From $19.99/mo · $39.99/yrOEM procedures, specs and recall/TSB info, the same source many shops use.
From $19.99/mo · $59.99/yrStep-by-step photos written from a real teardown. Great for first-timers.
Books ~$30–$40 · AllAccess $34.99/moHeads 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 2004 Mitsubishi Diamante have any recalls?
Yes. NHTSA lists 1 vehicle recall for the 2004 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 2004 Mitsubishi Diamante problems?
Owners have filed 3 complaints with NHTSA. The most-reported areas are transmission & drivetrain (3).
What gas mileage does the 2004 Mitsubishi Diamante get?
EPA ratings run up to 18 mpg combined (3.5 L, Automatic 4-spd), across 2 engine and transmission combos.
Where can I get a 2004 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.