Starting problem for 1999 Lexus GS300

Have you checked the oil,checked to see if dipstick and fuel cap are tight.Do you have oil spots on driveway? Those are the first things I would check,if oil is on driveway is it coming from the oil pan.It 'seems" it May be tied in with the oil change from 2 weeks ago

try to get a re-manufactured head, a valve job is not cheap

When you change your oil is up to you,you set the
months & miles you go. Any car with a reminder
for oil is just a gadget

You were told that your low on a/c refrigerant by the
message

Now the check light related or not has to be addressed,
by checking for codes & diagnosing the effected system

Your a/c system needs repair,not added to, only to leak out
& polute the atmosphere

Every single 2006 gs300 will have this problem, and even after it has been "fixed" it's going to happen again due to the intake valves not being washed by incoming fuel. The design of the engine is a poor design and shouldn't have never been put out to production and sold to anybody. Lexus extended the warranty for this problem for 9 years and will not do a single thing for you if you're even one day out of the 9 years. Every single 06 gs300 should have been replaced with a completely different car under the lemon law the moment they realized the problem, but to save the money lexus just swept it under the rug leaving hundreds of thousands of their customers with a lemon.

It depends. If you are talking about the RED oil pressure warning light, the problem is either that your engine has oil pressure problems or it has a defective oil pressure sending unit. If it is actual oil pressure problems, major engine repair or replacement will be necessary to fix it.

I doubt very much this has anything to do with the tires or alignment. It sounds like you have misfiring in the engine, possibly because of a faulty sensor. The first thing to do is to check whether you still have a warranty with such low mileage - your dealer may fix it for free! If the warranty has expired, get a readout of the engine trouble code. The fix may be as simple as spraying throttle body cleaner into the Mass Airflow Sensor (careful - there are very fragile fine wires inside), or you may have a loose connection on the oxygen sensor (sometimes it gets bumped during an oil change on this model).

cabin filter is behind glove box (make sure u have vacuum handy - lots of debrees will come out)

Make sure u balance front tires

Its a Oil Control Valve most likely. Get the valve. Its like 100 from Lexus. Mine did the exact same thing with that code. GS300

in the winter i'd run castrol 5w30 and in the summer cartrol 10w30 or what ever brand you want if its using oil you may want to use a little thicker oil(10w40 or 20w50)

this light indicate tha oil level is low in engine , make a service oil ,or check the level, this light have an sender in oil pan and could be dirty