SOURCE: P0401. P0133, P1131- emmision test
Based on what the tech manuals say I would change the DPFE sensor for the EGR Valve, careful not to tear the special silicone rubber hoses that go to it from the exhaust, as a Ford dealer tech I saw these codes allot, and the DPFE sensor was almost always the issue or the hoses going to it.
SOURCE: i need to know the meaning of code p1131 on 2001 ford escape
P 1131 Oxygen sensor bank 1 sensor 1 lack of switching, You can have a vauum leak causing this sensor to read lean or the sensor went out and doesnt switch
SOURCE: What is check engine light codes P 1401 and P1131?
This is for the P1401
HE - Exhaust Gas Recirculation (EGR) Systems
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This is for teh P1131
H - Fuel Control
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SOURCE: Getting P1151 and P1131 codes on my 98 Ford
No that is it, More then likely your 02 sensor needs to be replaced.
But other possible causes would be excessive fuel pressure, leaking/contaminated fuel injectors, leaking pressure regulator, low fuel pressure or running out of fuel, vapor recovery system.
Other possible causes could be: Air leaks after the MAF, vacuum leaks.
Possible causes PVC system:
improperly seated engine oil dip-stick.
Possible causes EGR system:
Leaking gasket, stuck EGR valve, leaking diaphragm or EVR.
Possible causes Base engine:
Oil over filled, cam timing, cylinder compression, exhaust leaks before or near H02S(s).
I know its a lot of info but it could be anything. Take your time, good luck. Let me know how it is going.
SOURCE: fault codes ''failed smog check''
http://www.bba-reman.com/content.aspx?content=Ford%20P%20Powertrain%20Diagnostic%20Fault%20Codes
from experience the system is to lean not getting enough gas which causes lost of power pinging rough idoling and it clogs your fuel injectors which will cause failed smog test good luck
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