Help with P0068 Trouble Code for Check Engine Light

[portiz]

I'm seeking your expert advice to help me get the check engine light off so that my Explorer Sport will pass its inspection test. Here are the dirty details:

Vehicle is a 2003 Ford Explorer Sport – 6 cylinder, 4.0 liter SOHC, 2 Wheel Drive, Automatic transmission, 139,000 miles on it (not a Sport Trac)

Trouble Code that constantly comes up when checked at Auto Zone is P0068
Definition - Throttle position and engine load do not agree
Explanation - The ECM detected that the TPS value and engine load do not agree with the expected TPS value and engine load.
Probable Cause - Check engine for vacuum leak. Check engine condition-mechanical condition, plugged exhaust or intake. Transmission condition.

So far I have replaced the following with new parts:
• Throttle Position Sensor
• EGR Valve Pressure Sensor
• Transmission Speed Sensor
• Vehicle/Wheel Speed Sensor
• Idle Air Control Valve
• Mass Airflow Sensor
• Oxygen Sensors (all 3 of them)

I have also cleaned the intake hoses and housing and had the vehicle professionaly checked for a vacuum leak and none was found.

Each time I replaced one of the above listed parts, I killed the battery to reset the computer and then after driving for about 10 miles, the check engine light would come back on. Other than some rough low idling every now and then, the engine has been running the same since before this check engine light came on back in February.

What do you guys and gals think?

 

[98rojo]

Similar problem

Hi there. This is a long shot, but I read your post and have a similar problem. I've noticed that your post didn't get any response, but was wondering if you resolved the problem since it's been 2 years. I've changed out most of the same parts you did and still after re-setting the check engine light with my scanner, after driving about 10 miles I get the same code P0068. If you or anyone could help, it would greatly be appreciated. Thank you.

 

[Runnin'OnEmpty]

Might be a catalytic converter starting to clog up...?

 

[98rojo]

Re: catalytic converter

Thanks for the suggestion. I had what seemed to be a c.c. problem about a year ago...I had no power and the engine idled weird sometimes cutting off. Then it somehow fixed itself. I must have forgotten all about it. I'll look into replacing the one as it needs it anyways.
With any luck, the check engine light will chill after new c.c.
Thank again!