Remove Oil maintenance required message on 2008 Toyota Highlander

Oil Life Monitor Resetting (KD, KE)
Description
The engine oil life monitor will indicate when to change the engine oil and the engine oil filter - usually between 5 000 km (3,000 miles) and 12 500 km (7,500 miles) since the last oil change. Under severe conditions, the CHANGE OIL message may be displayed before 5 000 km (3,000 miles). The vehicle must not be driven more than 12 500 km (7,500 miles) or 12 months without an oil change.
The engine oil life monitor will not detect dust in the oil. If the vehicle is driven in a dusty area, be sure to change the oil every 5 000 km (3,000 miles) or sooner if the CHANGE ENGINE OIL message is displayed.
Reset the oil life monitor when the oil has been changed.
Resetting Procedure
Press the INFORMATION SKIP button on the DIC control panel in order to display the OIL LIFE LEFT message.
Press and hold the RESET NO button until the display shows 100% ENGINE OIL LIFE.

P0420 & P0430 You need new catalytic converter
The P0430 check engine light code, like P0420, means the catalyst system efficiency is below the required threshold. Simply put, this means your car is adding more pollution into the air than it's supposed to.

You should change your engine oil and oil filter at 3000 miles with a good brand engine oil then change it every 5000 miles or 6 months which ever comes first.
Good luck and thanks for your question and I hope my suggestions help. Don't forget to rate me.
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Hello. Welcome to FIxYa. Please allow us to assist you

The maintenance required light is there to remind you that your oil change is due. This light needs to be reset after the oil ic changed, it is manually reset. If you just had your oil changed, the light will not go off by itself. The light is designed to illuminate after 5,000 miles since the last reset procedure.

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.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

theres no problem, its set to come on every7500 miles just to remind you to do the service, like oil changes etc, all you do is make sure mileage is showing in display, then turn key off, then push the button that shows the trip mileage hold that button in then turn key on but dont start truck make sure dash lights come on like when starting,okay continue to hold button may take 15 -25 seconds until you see maint light go off, done.hope this helps.

It is good for your engine.

You have a good maintenance culture.

Cheers and rate this.

Please email me on [email protected] and I will email you the procedure in printed matter.

Cheers

Replace the spark plugs at 60,000 miles

Replace the timing belt at 90,000 miles

Change the auto trans fluid every 30,000 miles

Change the coolant at 60,000 miles

Replace the air filter every 15,000 miles.

That is about it. Not much else is required.

Thanks for choosing FixYa for assistance, a FixYa rating (4 blue diamonds) would be greatly appreciated. Thanks in advance.

If the fluid smells burnt or is black, replace fluid. Manufacturer suggests that you inspect it at every 30,000 mile interval. I would suggest having it flushed every 75,000 miles as a normal maintenence.