Toni Rauch

New battery, then ECU problems...

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I own a 2002 IS300.

I had a Battery failure, so I got a new Battery. Since then, the following yellow lights always came on (not flashing), on the dashboard - engine warning, oil warning, failed light bulb. In addition, the small dial indicating miles per gallon has stopped working.

I tried resetting the ECU by disconnecting the negative side of the Battery for an hour - this didn't help. So I removed the EFI and ECTS fuses for a couple of minutes and then reinserted them.

The engine warning yellow light is now off but the other two remain. The MPG dial still doesn't function.

I have plenty of oil in the engine and cannot find any lights/bulbs that need replacing.

Before the Battery failed, there were no problems at all. "...a hell of a coincidence....?"

Any ideas or help will be appreciated....


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I suspect you have a blown fuse or two. Something like the MPX-B or Gauge fuse, but check all of them, engine bay and cabin fuse boxes.

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