Long story short. Took my F350 in to a the local Ford dealer. They came back with two codes. P0470 which is a Exhaust back pressure sensor and a p0299 which is a low turbo boost code. Now I am no mechanic and can barely use a wrench as electronics are my game.
Anyway came home and looked at what each code meant. A bad Exhaust back pressure switch can cause a 0299 code because it can cause the turbo to not work as well as other things.
Well this dealer didn't even talk about that code nor what it meant but just jumped at the bad turbo code recommending a 600-1600.00 fix. Someone on this forum suggested why not start with the 0470 code first because it can cause the 0299 code. (Thanks Cheezit for your great help.) I went to Ford this morning and bought the 80.00 EBP sensor and put it in myself. Took the truck on an hour test drive and SO FAR its working great. Even have that nice turbo whistle back. Still may fail but so far so good. If the fix to the EBP sensor keeps working I will never go back to that dealer again because they knew what the codes meant and didn't recommend the fix to the cheap problem but only to the more expensive issue which it looks like it may not have been an issue to begin with. If they had done the expensive turbo job when they were finished I most likely would still have the same problem.

 

Good job, way to research and get the right answers to your questions. Cheezit is a great resource and we are lucky to have some willing to donate their time and knowledge to us. Someone who is honest and on the front lines like others here are huge helps.

 

I also have a P0299 dtc code (Low turbo boost). The trouble is that I have now other codes. I have a OBDII reader and I reset this code two times. It comes back after about 140 miles are driven. I have a 2005 F-250 4X4. I have only had the truck for about six months. Though it has 165K miles on it, it otherwise runs great. The "low Turbo Boost" code started about a month ago. I had my local ford dealer update the computer to the latest calabration. They said it was already calabrated to the latest level. They recommended the turbo be removed and cleaned at a cost of about $500. Is this the only remedy for the P0299 dtc when it is the only code showing? All filters are new and the oil has recently been changed. Any advice would be appreciated.

 

Last post should read " The trouble is I have NO other codes.

 

p0299 can be caused by any number of things. from filters, oil, injectors, fuel pressure, boost/exhaust leaks, etc.

 

Thanks for the reply Cheezit. The fuel filters are three months old (only a few thousand miles), The oil and oil filter were changed last week (after the first time the hard code appeared). My OBDII reader stores a "Freeze Frame" when the code is tripped. I have a printout of some diagnostic data. Here are a few that are listed for this dtc:
Calculated load value = 54.90%, Intake Manifold absolute pressure = 36.72 inHg, Engine rpm = 1779, Vehicle speed = 60.27, intake air temp = 91.40 degrees F, Air flow rate mass air flow sensor = 11.74 lbs/min, Commanded EGR = 5.88%, Fuel Level input 43.14%,
Control Module voltage = 13.04 volts, Barometeric Pressure = 29.61 inHg

Does any of this help isolate the problem?

 

none of it. the p0299 dct is the one I hate to deal with the most. pretty much gotta have the truck if there is no other related codes.

 

Thanks Cheezit. With that in mind, I may be better off having my ford dealer perform the turbo cleaning. Since the motor has 165k miles it can only help the overall performance and hopefully solve the p0299 dtc. One last thing I have to ask you, do you think that replacing the factory air filter system with a K&N unit would be money well spent? Do the performance and fuel economy enhancements justify the cost? If so, would I have to reprogram the pcm with this installation? Should any other bolt-on upgrades be made at this time, keep in mind this is a general-use vehicle. Thanks, your opinion means alot.

 

There are no performance benefits (except more turbo whistle noise) or fuel economy increases with add-on intakes (up to about 500 hp).

 

+1 on this.

 

Bismic and Cheezit, Thank you for your professional opinions. I will be following your advice.

 

anytime