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Diagnostic Codes P0404 and P0405

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Old 03-07-2007, 04:09 PM
Princeton Bill Princeton Bill is offline
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Diagnostic Codes P0404 and P0405

Went to install a HYPERTECH POWER PROGRAMMER III on my truck and subject codes showed up.

The truck is a 2004 F-250 Super Duty with the 6.0 diesel. Curretnly DTCs P0404 and P0405 are showing up in the computer. The definitions for the codes furnished by John Patton on this site are: P0404 is "Exhaust Gas Recirculation Circuit range/Performance' P0405 is "Exhaust Gas RecirculationSensor A Circuit Low"

The local dealer worked on the truck about 6 weeks ago. He worked on the EGR and rebuilt the turbo.

I know less than nothing about the codes, etc. I would like a simple definition of the codes and what they mean as far as performance. Also I would like to know under normal circumstance would the dealer have worked on the truck's EGR and then cleared the codes or would he have left them in the computer. The only info I have is that the codes are in the computer. Can the dealers reader determine what date the codes first entered the computer?

With the HYPERTEK I can clear the codes from the computer. Should I do that and see if they show up again or would the best thing be to take it back to the dealer?

Thanks in advance.
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Old 03-07-2007, 04:12 PM
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OZX1 OZX1 is offline
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Look here for your information on codes
http://www.ford-trucks.com/article/i...sel_Codes.html
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Old 03-07-2007, 04:38 PM
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As stated, he has already read the codes.

I am not a tech but, it has been my experience that the techs clear the codes. If the codes have reappeared I would hazard a guess that you have a recurring EGR Valve problem. They just service the EGR Valve or did they replace it? Also, take a look and see if it is plugged in. Mine never was....
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Old 03-07-2007, 04:52 PM
Princeton Bill Princeton Bill is offline
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Thanks for the quick responses.

Stupid question, where do you look to see if the EGR valve is plugged in?
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Old 03-07-2007, 05:03 PM
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Here you go.....http://www.ford-trucks.com/forums/28...tructions.html
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Old 03-07-2007, 05:05 PM
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Quote:
Originally Posted by kw5413
As stated, he has already read the codes.
Yup. I was too fast to the buzzer and not paying attention. I'm humbled.
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Old 03-07-2007, 06:40 PM
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If the motor is under warranty. Let the dealer do the work and not worry.
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Old 03-08-2007, 11:24 AM
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Quote:
Originally Posted by kw5413
As stated, he has already read the codes.

I am not a tech but, it has been my experience that the techs clear the codes. If the codes have reappeared I would hazard a guess that you have a recurring EGR Valve problem. They just service the EGR Valve or did they replace it? Also, take a look and see if it is plugged in. Mine never was....

EXACTLY!! My 04 gives the same codes when the egr plug fell off . Plugged it back in (just to check) cleared it w/ my edge and code did not come back.
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