Skip the auto shop - Our mechanics make house calls

Q: Hello I have a 2006 f150 XLT with a 2v 4.6. It has a cold air intake from k

asked by on

Hello I have a 2006 f150 XLT with a 2v 4.6. It has a cold air intake from k&n high performance coil packs Granatelli and a programmer from Edge. The programmer is mounted on the dashboard. Admittedly this truck used to live in my garage where I would clean the cold air intake and recharge it with oil once every 4 to 6 months. I have not done this in about a year. Approximately six to eight months ago my truck when I would look give me an error code for the throttle position sensor Postion E. thinking about it now this is also when occasionally after driving for a while if I shut the truck off ran into a store or filled up the tank I would go to start it would occasionally give me trouble starting where it wouldn't start right up or it would stall out the first time so I would reset the key to off and then start over and no problem. Last night I got 2 codes 2126 and 2104. No pedal at all. I turned it off and restarted and no issues. No codes. What could be happening

My car has 80000 miles.
My car has an automatic transmission.

A: Hi, thanks for writing in. I’d be happy to ...

Hi, thanks for writing in. I’d be happy to help you. Code P2104 relates the throttle position control actuator, and code P2126 relates to the throttle position sensor. When either of these components is not working properly, this can cause the truck to have intermittent starting issues as you describe.

When the ECU detects that the throttle position control is out of range or not in the position the ECU thinks it should be in, this code will appear. The throttle position sensor is a sensor that monitors the position of this and when it is not functioning correctly, this will cause inaccurate info to be supplied to the computer which will cause an imbalance of air/fuel to be supplied to the motor. This is what causes the intermittent starting and stalling problems.

I would recommend having an expert from YourMechanic come to your home to confirm a diagnosis on the issue and make or suggest the necessary repairs or replacements.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Shake and vibrating when i brake.

This is a common concern and can be tied to one or more of a few problems. If you feel the vibration most while braking, the rotors may be warped. If the vibration is more consistent with high speeds rather...

Q: My car will start and the theft light comes on then car jerks

Hello, and thank you for writing in. When multiple sensors and warning lights appear to fail, the culprit is typically electrical. You may want to start with a basic charging system test, which would include testing the battery and the...

Q: My car is cranking but not starting - 2003 Chevrolet Malibu

Hi there. If you've kept the vehicle in storage for five years and it was not started during that time, it's possible that the fuel inside the tank has gone bad. Gasoline, like anything that is refined for use, has...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.