2003 Infiniti M45 Sedan Review | Edmunds.com

2003 Infiniti M45 Sedan

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Certified Pre-Owned (CPO) is a category of used car. Often late-model vehicles, they have been inspected, refurbished, if necessary, and are under warranty by the manufacturer.
Infiniti M45 Features and Specs

Features & Specs

  • Engine 4.5 L V 8-cylinder
  • Drivetrain Rear Wheel Drive
  • Transmission 5-speed Automatic
  • Horse Power 340 hp @ 6400 rpm
  • Fuel Economy 16/22 mpg
  • Bluetooth No
  • Navigation No
  • Heated Seats Yes

Review of the 2003 Infiniti M45

  • A capable Japanese sedan that makes a worthwhile alternative to Germany's midsize stalwarts.

  • Safety
  • Pros

    Brawny V8 engine, capable handling, plenty of luxury features, reasonable price.

  • Cons

    Limited rear-seat legroom and trunk space, fussy control layout.

  • What's New for 2003

    The M45 performance sport sedan comes standard with class-leading V8 performance and a long list of world-class amenities.

Full 2003 Infiniti M45 Review

What's New for 2003

The M45 performance sport sedan comes standard with class-leading V8 performance and a long list of world-class amenities.

What Others Are Saying

Customer Reviews

Definitely an all around muscle

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Vehicle: 2003 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

I purchased this car 1 year ago fully loaded with 65k miles on the clock. The car gets loads of attention and compliments, my mechanic always compliments the powerful v8 and many get surprised when they find out the car has 340 horses under the hood. Ive had a few issues with the car, like the fuel gauge inaccuracy which has left me stranded a few times on the road. My camshaft position sensor failed me at around 75k miles. My only complaint is parts are scarce and everything must be special ordered from infiniti. Other than parts issues, recalls, and general maintenance this car is flawless .

2 of 2 people found this review helpful

Nice car bad back seat

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Vehicle: 2003 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

Purchased the car about 8 months ago. It had 124,000 miles on it. I was on a local government auction site and saw it. I wasn't even looking for a car. I was actually looking for something else not car related. It had issues. Needed paint, starter, driver seat and some tlc. I checked for recalls and found that it had 2 recalls that needed to be done. Infiniti fixed them. While at the Infiniti Shop they saw that the gas gauge wasn't working properly. That was a $1000.00+ to repair. So after getting it painted, a new driver seat, starter and putting some tlc in it at an additional cost of $1000.00+ I finally think I have a great running car. Car has some get up to it.

1 of 1 people found this review helpful

Always liked the style and

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Vehicle: 2003 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

I just purchased a 2003 M45 with 70,000 miles on it. I've always liked the style and the power is great. Its a great used car bargain I'm just glad I never bought it new. The quality is below luxury in my book. I also have a Lexus the quality of the material and finish is top notch. The Infiniti not so much trunk struts don't work, center arm rest is cheap and feels loose, sunroof liner coming apart, fuel guage not reading correctly (recalled ), engine doesn't start up on first try sometimes, and airbag light is on. Alot of issues for a car with 70k, but I've always wanted one and I dont regret buying it for $7500. Especially since its not a daily driver. I have a Gs300 and Yaris for that.

2 of 4 people found this review helpful

Don't buy it.

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Vehicle: 2003 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

Obviously all used cars now and if you see one on the lot steer clear and let it rot on the lot. We have owned one now for about 4 years and up til recently have been some what satisfied. It has about 80K on it and everything is falling apart. Like previous poster gas guage is unreliable and it has been in the shop waiting for a part for over a week now. The whole instrument cluster has to be replaced!! A big rig has a tighter turning radius. Interior lights have been replaced a few times too and rarely work correctly. Infinities are not built to last.

03 infiniti m45 best car

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Vehicle: 2003 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

Best car i ever bought.Paid 15,000 with only 88,000 and a full elite Infiniti warranty.had major oil burning issue which Infiniti took care of and replaced L.B. @ 96,000. Fun to drive,very fast,and looks great.

1 of 1 people found this review helpful

Jeckyll and hyde

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Vehicle: 2003 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

I still believe this car is a Jeckyll and Hyde. We're still enjoying the power, but the transmission isn't very responsive and the manual mode is worthless. The seats are comfortable and have nice amenities, but the driver's seat squeaks now. We still love all the gadgets, but they are difficult to use. We've encountered more issues, but we do have 108K miles now. The exhaust manifold was changed under warranty. Now it's cracked again - poorly engineered. We still burn a quart every 1,000 miles (108 quarts so far!) Tire wear is phenomenal. The originals ran 28K miles. The second set were Essenzia and were just changed. The new Hankook Ventas don't feel very good on the car.

Talk About The 2003 M45

2003 Infiniti M45 Discussions See all Started By

M45 Sport with 7,000 miles. Not one single problem with mechanicals or tires. 2003 G35 Coupe, 25,000 miles, not one single problem of any type. 2003 MB SL500, 25,000 miles...not one single problem o...

already announced...its the M45...

The M45 turning 2,300 at 60 was initially a concern for me....

Read more about the 2003 Infiniti M45

Gas Mileage


  • 16
  • cty
  • 22
  • highway
Calculate Yearly Fuel Costs
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