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Old 02-11-2013, 05:12 PM   #1
just jhon
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P0401 code in Zetec 16V engine ????

Hi, i have a 2001 - ZX3 with a Zetec 16v engine on it, its has the ckeck ligth on, with a P0401 code , the car run fine, just sometimes only oscillates, and go under 800 rpm when i back to neutral (N) without the A/C, but not both at the same time, , please someone help wiyh this, i really appreciate....


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Old 02-11-2013, 06:42 PM   #2
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Moved to "General Technical Chat".
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Old 02-11-2013, 06:46 PM   #3
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DPFE sensor failure is common on your year. (EGR = Exhaust Gas Recirculation)

P0401 - EGR Flow Insufficient Detected
The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
Causes:
Vacuum supply
EGR valve stuck closed
EGR valve leaks vacuum
EGR flow path restricted
EGRVR circuit shorted to PWR
VREF open to D.P.F. EGR sensor
D.P.F. EGR sensor downstream hose off or plugged
EGRVR circuit open to PCM
VPWR open to EGRVR solenoid
D.P.F. EGR sensor hoses both off
D.P.F. EGR sensor hoses reversed
Damaged EGR orifice tube
Damaged EGRVR solenoid
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Old 02-11-2013, 06:55 PM   #4
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WOW :( and how i know what it is ?????? all this signals is the same code ????
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Old 02-11-2013, 08:38 PM   #5
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Check for a Vacuum leak first, if you dont find one, then your best bet is a trip to the mechanic for a diagnostic to find out exactly what part failed.
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Old 02-12-2013, 11:10 PM   #6
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Most engine codes have that many different things that cause same code. That's why it's so funny when people throw parts at the problem without checking any of the other possibilities.

In this case though, the DPFE sensor like he says, often the cause.
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