I mailed yesterday about the problem with ouy hibrid prius. The problem is there is a warning light and a triangle sign appear. The problem is that we dont understand what is this sign for, and also the manual of the car is in japanese writings and all wrintings on the car were also in japanese. please do help us because we are worrying so much as our car we just bought it three months ago.

STOP engine light. There is something seriously wrong so do not operate/drive the vehicle before finding and repairing whatever is causing this light to come on!

It is called Master Warning sign. Get the car be scanned to know about the root cause of the problem.

Orange triangle sign is called master warning light. When this happens get your car be scanned with the help of diagnostic computer to get to know the problem in any of the systems.

The Triangle indication:
Description: MASTER WARNING LIGHT.
The battery ECU has a self-diagnosis system. If the computer, High Voltage (HV) battery system or the components are not working properly, the ECU carries out a diagnosis to detect the malfunction, and illuminates the master warning light in the combination meter together with the HV system warning indicator on the multi information display.
NOTE:
The master warning light illuminates when the HV battery system fails and it blinks when in inspection mode.

Click to see.

Hello,
There is absolutely nothing wrong with your car. It's actually keeping you safe! If the outside ambient temperature is +37F or lower, your car knows this and gives a warning for possible black ice conditions. Lots of people wonder the same thing, next time it shows the warning, note the outside temp to see if it's below +37F.

I hope this info helps!
~subyguru~

When this warning light turn on, your vehicle is advise that any foulat in there? You have other syntom about maltfunction there? Low leel fluids, loss power, overheating, etc etc?

I have same engine problem. Triangle signal pop up after I try to start my Prius with a still wet air filter to the car . The engine just run for less than 30 sec. and stopped with the triangle signe pop up. I think this sign will pop up whenever the engine detect certain major function failure. For my case, it was due to retricted air supply to the engine. I have tried Lovebytes suggestion and the triangle sign disappeared with a dry clean filter. My Prius is running good now. This warnig sign may have other implications. Once you try this method and sign still come on. You need to have your car check by garage.
Bellow attach is the answer from Lovebites

posted on Aug 21, 2008 Asker's Rating
Lovebytes
Rank: Apprentice
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I had the same problem. I unplugged the relays from the fuse/relay box under the bonnet. (Top left side) and replaced them. The problem disappeared. (2001 Prius 109,000 miles)

You will need to have this light reset with a scan tool, it is stored in a non-volatile (stays in memory with or without battery voltage) memory. Have the dealer check the cause, better than a tow bill.

My Toyota Prius hybrid warning light has come on three times in eight years. If I turn the car off for 20 minutes, the hybrid light is off but the check engine light is on. After a while, the check engine light goes off. I think this problem is related to moisture somehow entering the hybrid vent on the driver's side. All three times this has happened, the weather was wet. Kevin Cardiff