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Re: check engine light on;engine codes p0420 and p0773
I looked up the codes you posted.
P0420 is showing a bad oxygen sensor on bank #1, the one down by the catalytic converter.
P0773 is an electrical problem with the shift solenoid E.
A bad oxygen sensor would cause lower fuel milage.
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Toyota has had problems with their throttle systems, I have never seen an accidental, unwanted acceleration, but I have seen pedal and throttle position sensor codes several times with theses systems. You need to scan the car for codes, as there are several hundred. The VCS and ETS are all part of the same system, that being the power train control. Take it to a Auto zone for a quick scan or you can buy cheap scanner online that will give you just the codes to Google the problem. Since you have an ETS light which is a malfunction with the electronic throttle control, then you will get a check engine and a VSC light as well as they are all dependent on a properly working electronic throttle system. Good Luck :)
That could be a number of issues, lets start with the most common: 1. bad gas or plugged fuel filter 2. needs a tune up 3 clogged catalytic converter 4. weak or leaking spark plug wires 5. weak coil 6. blown head gasket. check your oil and anti-freeze, if they look like chocolate milk 7. If your check engine light is on, take it to a local auto zone or advance auto, they will read your vehicles codes for free and tell you if a sensor is bad!
You need to have a code reader/scan tool hooked up to retrieve the code/s that triggered the engine light. You can have this done at most auto parts stores for free. Try Auto zone, Checkers, Napa, or Murray's. The engine light will eventually go out if the computer does not receive any codes after many cycles turning the ignition on and off. It will not go out if there are codes still present. After you've retrieve the code/s bring them back here and we will have a better understanding of what caused them.
You can expect the check engine light to come on, on any vehicle when it gets close to 40,000 mi. The emission system has to do with the pollution control. There are several sensors that monitor your engines performance. You can still drive the vehicle, it may just not get good gas mileage or you may notice something about the engines performance. I've drove several months before actually having something done. A good garage will have a scanner and can tell you what sensor is acting up. It usually cost around $60 - $70 just to have it checked out. I had an old work van that I drove for years with the light on.
Is it blowing blue smoke out the exhuast pipe or lose of compression? Then that means you have bad rings. What where the codes that they got out of the computer? Sounds like the dealer is trying to rip you off unless you never did oil changes to the truck still yet gas would end up in the oil pan. Take it to a parts store that will scan the computer for free. Auto Zone does it and I think Advance auto parts does it also. Sucking gas like crazy sounds more like its burning rich. It could be a number of things, need the codes. Is this the 4.0L? Or a 4.2L? it could be the vacuum pods on the back of the lower intake which in this cause will cause the truck to burn lean or rich. Need the codes.
You cant adjust it. Your car has a tps sensor " throttle position sensor " and a iac idle air control. these are both on the throttle body. is the check engine light on? The best way to check them is on a scanner at places like auto zone they will let you use one for free. and will help you do it. first check the codes if any then look at live data scroll down till you see tps and look at its values rev the motor up and it should change values are 0% to 100% no throttle to full throttle. at idle it should be 18 to 26 or so. if it doesnt change or its at a high number and no gas is being given then its bad. also look at the iac and see if it changes as well. you can also google the resistence values for each and ohm them out. It does sound like a bad tps. try that first , and the tps is easy to change