two times now my 200 es300 has been jerking when accelerating from a stop sign and when in park the speedometer revves up instead for down.There is a hesitancy to pickup speed.Have already tried the seafoam Treatment

 

The symptoms might be pointing to a defective TPS throttle position sensor. The only way the computer knows you are pressing the gas peddle and opening the throttle plate is through the TPS. A sketchy TPS will usually cause flat spots while accelerating etc. They can be tested with a scan tool (key on, engine off) or a digital multimeter. If yours turns out defective, you should stick with a denso brand replacement.

 

there was some smoke coming from the engine bay earlier when the same thing happened and then when i took it to the first Mechanic he drove it and it sounded Fine,he suggested getting a Fuel injection cleaner.Another Mechanic he suggested a Tune up about 320.00 Total...

 

I REPLACED the TPS sensor in February

 

For my 98es300 it was a defective air fuel ratio sensor. Is your check engine light on by any chance?

 

The saying goes "Where there is smoke, there is fire". If anything else besides a trace of oil on the exhaust is burning, the smoke needs to be identified. Did the smoke have an odor like burning oil, or an electrical smell?
Some professional scan tools have a function that reads "Mode 6" data from the vehicle PCM. Mode 6 is information the PCM stores in hexadecimal code on components that either fall within manufacturer specifications, or are progressively starting to fail and ultimately cause a check engine light. Find a mechanic that is fluent in mode 6 data usage and see if they can pinpoint the problem for you. You can purchase a professional scan too with this feature for around $250.00 or more, but there is a moderately long learning curve to using one. Manufacturers do not easily give out information on mode 6, because that is how they make money.

 

Turns out it was my Oil Valve Control and VT sensor that were out, Mechanic even changed the Spark Plugs for Good measure for no extra Charge.

 

well as i was driving an errand the CEL and VSC came back on WENT TO AUTOZONE and PO171 came back
Ssytem too lean-bank1(cylinder number 1 denotes bank 1)

i have already replaced the O2 sensor towards the front of the car...any ideas

 

System too lean doesn't necessarily mean that the O2 sensor is bad, but instead may mean that the system is actually too lean (too much air). I would try cleaning the MAF Sensor.

 

Which brand O2 sensor did you use, I wouldn't use anything but Denso

 

Bank 1 sensor 1 is the O2 sensor between the engine and the firewall. Sounds like you replaced the wrong sensor.

 

Thanks tomf,i have been thinking the same thing,but what is the part number for these o2 sensor or what do you ask for at a Parts Store say like Autozone.

 

For what you would pay at Auto Zone for one sensor, you could go to RockAuto.com, or Amazon.com and get both bank one and bank 2 o2 sensors. If one is failing, the other one is probably not far behind. Purchase Denso sensors with the connector already attached.