0401 code on 2001 v-06 f150
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0401 code on 2001 v-06 f150
I have a 2001 f-150 v-6 with a 0401 code.....pull vacuum on egr valve and the engine stalls....on the dpfe sensor the reference voltage is 5.0 volts and on the signal it reads .15 volts. does anybody have anymore suggestions on what thi could be
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For the second time, voltage readings don't mean much on a sensor that has to measure pressure differences across an orface in the metal tube it's attached to by rubber hoses?.
Suppose one side is frozen with combustion by products and/or is plugged or corroded?
Voltage means little for this kind of condition.
Good luck.
Suppose one side is frozen with combustion by products and/or is plugged or corroded?
Voltage means little for this kind of condition.
Good luck.
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replaced dpfe sensor with oem...401 code went away...thank you bluegrass...been gone for a week now...both 0174 and 0420 have popped up .any correlation here or are they different all together, any suggestions would be greatly appreciated
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174 is a lean code for bank 2.
420 is the detection of low Cat efficiency bank 1.
Neither are 'directly' related to the 401 code.
I am surprised you didnn't see these codes before.
.
174 is usually an air leak into the intake after the Mass Air meter.
The 420 results when the computer detects an OX Sensor switching 'ratio' out of limits.
Normally it is a bad cat assembly since the front sensor is switching full time as compaired to the rear that switches slow and less often.
It's this ratio the computer looks at. When the rear switches too often.
It's possible for the rear sensor to be faulty but not likely.
A Scanner looking at live data for the rear sensor should show the action as compaired to the other side that you assume is still good.
Note that what can happen is if left in this condition to long, the computer abandons the reading as useless and a reading of zero might be seen.
Good luck.
420 is the detection of low Cat efficiency bank 1.
Neither are 'directly' related to the 401 code.
I am surprised you didnn't see these codes before.
.
174 is usually an air leak into the intake after the Mass Air meter.
The 420 results when the computer detects an OX Sensor switching 'ratio' out of limits.
Normally it is a bad cat assembly since the front sensor is switching full time as compaired to the rear that switches slow and less often.
It's this ratio the computer looks at. When the rear switches too often.
It's possible for the rear sensor to be faulty but not likely.
A Scanner looking at live data for the rear sensor should show the action as compaired to the other side that you assume is still good.
Note that what can happen is if left in this condition to long, the computer abandons the reading as useless and a reading of zero might be seen.
Good luck.
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