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You need to diagnose the EGR System Not replace parts in hope of getting it right Codes only indicate an Emissions Malfunction or Fault, thus the code Codes & trouble charts are used to then component test Google the code & study the problem There are many EGR Codes--- study yours ,as it pertains to your vehicle & engine package Try You Tube Video-- to get a basic of what egr system is & does
MAF Sensor Signal Range/Performance
Camshaft Position (CMP) Sensor Performance
EGR Pintle Position
need to do full diagnosis to pin point mutiple codes cause one component can cause the computer to over compensate and throw up additional trouble codes
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
code P0101 it means that MAF meter is out of range .no reprogramming the ECM is not gone fix youre problem, the car may have a vacuum leak check the vacuum hoses check you're EGR valve it may be stuck open with carbon also check fuel pressure regulator for fuel leak out of vacuum hose,and if everything is OK change MAF sensor .before that check MAF connector to make sure is not loose or open
Hello mark...according to the manual for Volkswagen Engine and Transmission Codes...
P0101 Mass or volume air flow circuit performance problem
P3131 Exhaust Gas Recirculation (EGR) System Control Limit Exceeded
Dirt and carbon build up will cause this in some cases. You might try removing and cleaning the MAF sensor with an electrical contact cleaner first. You will still need to clear the error codes with VAG-COM and see if they return.
p0404 is egr flow range, remove and clean egr passage way, it maybe built up with carbon, p0101 remove and clean mass air flow sensor. you can buy the cleaner at any auto parts store. but be carefull of the inside of sensor, follow directions on can. this should help a lot!!