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If the light were not on before you cleaned, it's highly possible your cleaning caused the problem. Did you wash the engine area off? If so, disconnect negative battery cable and disconnect all engine and computer (ECM) connectors and check for moisture, blow out and dry as needed. Reinstall connectors and cable. Do not use any grease or di-electric grease in connectors.
I currently have the same issue on my 2008 Tundra. I have noticed that one of the 12v acces plugs don't work. The problem is intermittent and started when the air was damp or after it rained. Now the same lights are on, the 12v doesn't work and the remote door locks don't work. Toyota want to run a diagnostic check at $125 an hour. Did you solve your problem?
The maintenance required light lets you know its time for an oil change. Once the oil is changed the light can be reset. The light will usually blink for a few seconds as you approach the 5,000 mile mark and then stay on steady as the 5,000 mile mark is reached or surpassed.
If you have a Owners manual it will tell you. If Not a quick call to a Toyota dealer Service Department with your question will get you an answer. It will be easy to do. Just write the process down and put it in your glove box for next time.
Oil Change Reminder Lamp: Service and Repair
Engine Oil Replacement Reminder Light
This light acts as a reminder to replace the engine oil.
This light will come on when the ignition key is turned to "ON" and will go off after about a few seconds.
When you drive for about 7200 km (4500 miles) after the engine oil replacement, this light illuminates for about 3 seconds and then flashes for about
12 seconds with the ignition key turned to the "ON" position. If you continue driving without replacing the engine oil, and if the distance driven
exceeds 8000 km(5000 miles), the light will come on. The light will remain on thereafter.
If the light is flashing, we recommend that you replace the engine oil at an early opportunity depending on the driving and road conditions. If the light
comes on, replace it as soon as possible.
Resetting the system
The system must be reset after the engine oil replacement. Reset the system by the following procedure:
1. Turn the ignition key to the "OFF" position with the odometer reading shown.
2. Turn the ignition key to the "ON" position while holding down the "TRIP METER" reset button.
Hold down the knob for atleast 5 seconds. The odometer indicates "000000" and the light goes off.
If the system fails to reset, the light will continue flashing.
To reset your maintenance reminder system (even if the light hasn’t come on yet), you’ll need to turn your key to on (but don’t start!) and make sure your odometer is on TRIP A. Then key off. Press and hold the Odometer/Trip button. While holding down on the button, key the ignition to on (Don’t start the engine!) The display panel will count down from “------“ to “-“Continue pressing the button until the Trip A is displayed.
If you mean that the oil light was illuminated on the dash, it means the vehicle has no oil pressure, or it is dangerously low. You should check the oil level immediately, and if it is full, you should have a mechanic look at it. It cannot be run or driven if the oil light is on! Being a 2008 I would assume it is under warranty, atleast the 60 month 60,000 mile powertrain warranty. The old Tundra 4.7 engines had problems with the oil pressure sending units, but I havent seen any new trucks with that problem, and no service bulletins.
Unless your vehicle is driven in what we call "severe" conditions (dusty roads/heavy towing, etc); stay with the reg maint schedule. No reason to do the optional unless you vehicle is really working hard.