P0170 & P0402 Codes
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7th Gear
Joined: Sep 2022
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P0170 & P0402 Codes
I have recently purchased a used 2017 F250 6.7. I pulled the codes off Forscan. The dealership isn't able to get the truck in for over a month to even diagnose the issue. I have attached the DTC text from Forscan.
Is there anything I can do (besides finding another maintenance shop) on my end to solve the problem?
Is there anything I can do (besides finding another maintenance shop) on my end to solve the problem?
Mountain Pass
Joined: Feb 2013
Posts: 147
Likes: 58
From: NH
P0402
One of the three basic problems that produce this error code is:
To begin, the DPFE (differential pressure) sensor may be defective and should be replaced. In this case, the problem is a defective sensor rather than a performance problem. The simplest and best-case situation is as follows.
Second, the EGR could be obstructed. This blockage is most likely caused by carbon build-up, which can happen over time as particles accumulate, but it might also be caused by something else becoming lodged in that portion of the engine.
Finally, due to a lack of suction, the EGR valve could be broken and not open.
One of the three basic problems that produce this error code is:
To begin, the DPFE (differential pressure) sensor may be defective and should be replaced. In this case, the problem is a defective sensor rather than a performance problem. The simplest and best-case situation is as follows.
Second, the EGR could be obstructed. This blockage is most likely caused by carbon build-up, which can happen over time as particles accumulate, but it might also be caused by something else becoming lodged in that portion of the engine.
Finally, due to a lack of suction, the EGR valve could be broken and not open.
Thread Starter
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7th Gear
Joined: Sep 2022
Posts: 7
Likes: 0
P0402
One of the three basic problems that produce this error code is:
To begin, the DPFE (differential pressure) sensor may be defective and should be replaced. In this case, the problem is a defective sensor rather than a performance problem. The simplest and best-case situation is as follows.
Second, the EGR could be obstructed. This blockage is most likely caused by carbon build-up, which can happen over time as particles accumulate, but it might also be caused by something else becoming lodged in that portion of the engine.
Finally, due to a lack of suction, the EGR valve could be broken and not open.
One of the three basic problems that produce this error code is:
To begin, the DPFE (differential pressure) sensor may be defective and should be replaced. In this case, the problem is a defective sensor rather than a performance problem. The simplest and best-case situation is as follows.
Second, the EGR could be obstructed. This blockage is most likely caused by carbon build-up, which can happen over time as particles accumulate, but it might also be caused by something else becoming lodged in that portion of the engine.
Finally, due to a lack of suction, the EGR valve could be broken and not open.
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
The truck is probably trying to perform regens to clear what it thinks is a plugged up DPF. Fix the sensor first, then worry about the DTE display.
Thread Starter
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7th Gear
Joined: Sep 2022
Posts: 7
Likes: 0
P0402
One of the three basic problems that produce this error code is:
To begin, the DPFE (differential pressure) sensor may be defective and should be replaced. In this case, the problem is a defective sensor rather than a performance problem. The simplest and best-case situation is as follows.
Second, the EGR could be obstructed. This blockage is most likely caused by carbon build-up, which can happen over time as particles accumulate, but it might also be caused by something else becoming lodged in that portion of the engine.
Finally, due to a lack of suction, the EGR valve could be broken and not open.
One of the three basic problems that produce this error code is:
To begin, the DPFE (differential pressure) sensor may be defective and should be replaced. In this case, the problem is a defective sensor rather than a performance problem. The simplest and best-case situation is as follows.
Second, the EGR could be obstructed. This blockage is most likely caused by carbon build-up, which can happen over time as particles accumulate, but it might also be caused by something else becoming lodged in that portion of the engine.
Finally, due to a lack of suction, the EGR valve could be broken and not open.
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