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Resources for the Repair and Maintenance of your 2004 Toyota Prius

2004 Toyota Prius

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2004 Toyota Prius Problems

Engine -- Verified

The Check Engine Light may illuminate with a fault code P1121 stored. It is commonly caused by a failed three way coolant control valve. Valve replacement is recommended if this occurs.

Electrical & Lights -- Verified

The center multi-function display may failure. This is commonly caused by poorly soldered internal connection. Our technicians tell us that these display panels can be successfully repaired or reconditioned by a shop specializing in such repairs.

Electrical & Lights -- Verified

The fuel gauge may read incorrectly. Our technicians tell us there is a recalibration procedure which should be performed to correct this issue.

Exhaust & Emissions -- Verified

A no start or loss of power issue may develop if debris falls into the mass air flow sensor when changing or inspecting the air filter. Care should be taken when changing of replacing the air filter in order to avoid this issue.

Engine -- Verified

The power inverter coolant pump may fail resulting in illumination of the Check Engine Light associated with fault code P0A93 stored. Our technicians tell us the power inverter coolant pump should be replaced if this occurs. A revised pump is available for 2004-2006 models, Toyota service bulletin #EG001-07.

2004 Toyota Prius Recalls (Recent)

Body, Interior & Misc., April 6, 2006

RepairPal Expert Overview:

On 133 vehicles, certain airbag inflators were assembled with an insufficient amount of the heating agents necessary for proper airbag deployment.  In the event of a crash, if the airbag does not deploy as expected, the risk of injury will increase. Dealers will replace only the suspect airbags to correct this concern. The Toyota recall number is 60B. The Lexus recall number is 6LB.

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Body, Interior & Misc., December 31, 2009

RepairPal Expert Overview:

Toyota is recalling 2004–2010 models for an accelerator pedal that can get stuck in the wide open position due to problems with the floor mat. This may cause high vehicle speeds that make it difficult to stop the vehicle, which can result in a crash. In order to correct the problem, dealers will replace the pedals, alter the shape of the floor, and/or replace the floor mats. Toyota will also modify software on certain models to ensure that the brake overrides the accelerator in the event that both are applied.

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Electrical & Lights, December 20, 2004


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Suspension & Steering, November 14, 2012

RepairPal Expert Overview:

The affected vehicles have a steering intermediate extension shaft manufactured with metal splines that may have an insufficient hardness. Over time, the splines may wear and eventually fail resulting in a loss of steering ability, increasing the risk of a vehicle crash. Toyota dealers will inspect the extension shaft and replace if necessary. 


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Suspension & Steering, June 9, 2006

RepairPal Expert Overview:

The intermediate steering shaft and slip yoke may crack when large forces are applied and the connection may separate. This could result in a loss of steering control. Dealers will replace the intermediate steering shaft and inspect and replace the sliding yoke if needed. The recall began June 9, 2006. The Toyota recall number is 60C.

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2004 Toyota Prius Questions and Answers

Visitor, 2004 Toyota Prius, 1.5L 4 Cylinder, Lagrange, GA

When I turn on my a/c it says check air-condition connection on display. Now there is NO cold air at all.

Ta Tonka, 2004 Toyota Prius, 1.5L 4 Cylinder, Chantilly, VA

When I bought my wife a new Prius, I decided to keep her old one (2004) as a small run-around and parts getter for my Jeep (my obsession and money-pit). I have noticed that the Prius seems to shudd...

mrtv, 2004 Toyota Prius, 1.5L 4 Cylinder, Salisbury, MD

cost and recharging.

Paul Fredricks, 2004 Toyota Prius, 1.5L 4 Cylinder, Laguna Beach, CA

problem just occurred and it was diagnosed. do you recommend a n independentdealer ?

Doxey, 2004 Toyota Prius, Caledonia, MI

What does the Inverter do?

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2004 Toyota Prius Reviews

Purchased my 2004 Prius used in 2006. Love it 90%. Great mileage - I can get up to 50mpg in summer and 35-40 in winter (Minnesota). Seating could be more comfy - a little stiff. Also, 2004 fog light lenses break easily and they are expensive to replace. We added an after market (installed by Toyota recommended service) heated seats and I LOVE that option. Surprisingly this car carries tons of stuff we haul around. Only car we've had that my husband says he'd buy again.

I love this car (I have had 2 previous Prius's
The only conpaint I have is the body seems to be made from the lightest and cheapest material Toyota could find. By even looking at the car, you seem to get a dent !! Does anyone else have this problem or is it just me?
I would recommend this car to anyone that wants a fun and gas sipper for a car.

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