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code p 0400 refers to exhaust gas recirculation (EGR) system---flow malfunction===causes hose leak/blockage ---basic setting not carried out--wiring---EGR valve EGR solenoid--ECM
the code has nothing to do with a MAF sensor
The air filter is okay?
Personally, I would look at the MAF sensor - try disconnecting the electrical connector and driving the car. A warning light will appear on your dashboard, yes .. but if the car behaves as it should that points towards a faulty maf sensor.
You can also try disconnecting the O2 sensor - see what the car runs like.
My advice would be to NOT follow all the advice you get. Try things yourself. Your car runs ... but somewhere in the MAF sensor- EGR valve - O2 sensor there's a glitch. Do the simple things first - disconnect the MAF, clean the EGR ..
P1121 Ford Throttle Position Sensor Inconsistent with Mass Air Flow Sensor http://engine-codes.com/p0401_ford.html no they are not related !
Are there any cracks in the rubber hose from air cleaner to throttle body ! That could cause the P1121 air entering after mass air flow sensor !
P1121 - Throttle Position (TP) Sensor Inconsistent with MAF Sensor
The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.
Air leak between MAF sensor and throttle body
TP sensor not seated properly
Damaged TP sensor
Damaged MAF sensor
Drive vehicle and exercise throttle and TP sensor in all gears. A TP PID (TP V PID) less than 4.82 % (0.24 volt) with a LOAD PID greater than 55% or a TP V PID greater than 49.05% (2.44 volts) with a LOAD PID less than 30% indicates a hard fault.
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.
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
Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents
Have to replace egr gaskets that burn away or tubes that rust out
What you have is exhaust system leaks & a lack of fuel control or
fuel trim, where the oxygen sensors are saying one thing and the cars computer doesn't know about the unmetered air getting in after
the maf sensor,thus the poor perfromance
You can not have ANY vacuum leaks-- evap system,intake,exhaust,
you get the idea
Try removing & capping the vacuum hoses to egr
The egr valve may be bad
Replace any oxygen sensors over 100,000,miles
Replace spark plugs in motor over 3 years
Clean Maf Sensor (crc maf cleaner)
P0101 - Mass Air Flow (MAF) Circuit Range/Performance Problem Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds. Other MAF sensor circuit DTC trouble codes are P0100, P0102, P0103, and P0104.
Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms.
Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: * Inspect for the following conditions: An incorrectly routed harness--Inspect the harness of the MAF sensor in order to verify that it is not routed too close to the following components: - The secondary ignition wires or coils - Any solenoids - Any relays - Any motors * A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. Inspect for any vacuum leaks downstream of the MAF sensor. * A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor g/s display on the scan tool to increase rapidly. This increase should be from 6-12 g/s at idle to 230 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system. * The barometric pressure (BARO) that is used in order to calculate the predicted MAF value is initially based on the MAP sensor at key ON. * When the engine is running the MAP sensor value is continually updated near WOT. A skewed MAP sensor will cause the calculated MAF value to be inaccurate. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 103 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude. * A high resistance on the ground circuit of the MAP sensor can cause this DTC to set. * Any loss of vacuum to the MAP sensor can cause this DTC to set.
If you suspect the condition may be related to aftermarket accessories, refer to Checking Aftermarket Accessories in Wiring Systems.
Check this it is here as an aid in resolving your P0101 trouble code (DTC)...
P0401 - Insufficient EGR Flow EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.
Symptoms: You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.
Causes: A code P0401 most likely means one or more of the following has happened: * The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced * There is a blockage in the EGR (tube), most likely carbon buildup * The EGR valve is faulty * The EGR valve may not be opening due to a lack of vaccuum
Possible Solutions: In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit. * Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open * Clean out the EGR valve and/or tubing to remove deposits * Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model) * Replace the DPFE sensor (with a good quality / OEM one) * Replace the EGR valve
Replace the fuel filter and clean the MAF sensor with MAF cleaner. Just fallow the instrction to the MAF cleaner. The other thing to is the 1995 4.3 is know to have the EGR valve getting sluggish due to carbon build up. Remove the EGR valve and use Carb cleaner on it to remove the EGR valve and make sure it moves freely. Good luck and hope this helps.
to check the egr valve take some vacum hose had hook it to the egr valve.By removing the factory hose.next **** on the other end of the hose u should feel a vacum.If not and you can draw air it is no good.Also to check the maf sensor.you will need a ohm meter.a maf sensor messures air temp and turn it into signal for the computer to read.u will need the shop manual for the correct ohms.but just to try a quick test a maf has 3 wires.ok one of them is for the ground the other 2 are postive signal.find the 2 postive signal wires and take a ohm reading at room temp.now put it in the fridge for about 10 minutes and take a nother ohm reading it should be diffrent even if not by a lot. if its the same exact ohm im betting your maf is no good.