So if you ever change your own oil in your car or get anyone else other than Toyota to service your car, then you need to know how to re-set the annoying flashing yellow spanner light below the fuel gauge.
Put the key in the ignition and turn it up one notch. The dashboard lights will not turn on
Press the button next to the odometer to get it to Trip A (different models require either the ODO, Trip A or Trip B, so try all if Trip A doesnt work)
Hold down your trip meter button next to the odometer
When you are holding the trip meter button down, turn your key to the next notch. So, the dashboard lights will be on, but the car will not be started. Do not start the car.
The spanner shaped light flashes irregularly a few times
Continue holding the trip meter button for about 10-15 seconds or until the spanner light turns off. You have now reset your Maintenance Required light.
I have tried this on a 2009 Toyota Landcruiser Invincible and it works perfectly. If you have other models of Toyota or different Landcruiser years that this also works with, please post a comment!