DPF pressure sensor irregular error (P0471)

Discussion in 'Mk7 VW Golf, Sportwagen and Audi A3 TDI forums' started by Pongo, Oct 20, 2016.

  1. Pongo

    Pongo New Member

    Apr 14, 2015
    Skoda Fabia Greenline 1,4 TDI 2007, BMS
    Naestved, Denmark
    I have a model BMS engine / 2008 - just had my DPF flushed with Toralin dpf cleaner and replaced the pressure sensor to a new one which has been confirmed to me that it is the right part/number after checking an double checking and after adaptation/calibration I get a negative value ...once in a while I do get the P0471 error code like once a week and the engine light comes on, I guess due to the negative value as I understand it, the pressure sensor measures between 0 - 100 ?
    Please see below, any suggestions as to why and how to fix it would be very appreciated ! Thank you!

    Address 01: Engine Labels: 045-906-013-BMS.clb
    Control Module Part Number: 045 906 013 Q HW: 045 906 013 E
    Component and/or Version: R3 1,4L EDC G000SG 2592
    Software Coding: 0003071
    Work Shop Code: WSC 15937 159 999999
    VCID: 1D36415BC7A269D656-5000
    1 Fault Found:

    001137 - Exhaust Pressure Sensor 1 (G450)
    P0471 - 000 - Implausible Signal
    Freeze Frame:
    Fault Status: 01100000
    Fault Priority: 2
    Fault Frequency: 1
    Reset counter: 255
    Mileage: 260191 km
    Time Indication: 0

    Freeze Frame:
    RPM: 882 /min
    Speed: 0.0 km/h
    (no units): -43.35
    (no units): -15.30
    Mass Flow: 5.69 g/s
    Temperature: 120.0°C
    Temperature: 35.1°C

    Readiness: 0 0 0 0 1
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: (x64)
    Data version: 20150904


    Address 01: Engine (045 906 013 Q)

    -33.15 Press. Difference Particle Filter
    -30.60 Press. Difference Offset
    11.5 % Particle Filter Load Coefficient
    31.0 Particle Filter Carbon Mass
    0.0 Carbon Mass Learned Value
  2. Keithuk

    Keithuk Super Moderator

    Aug 29, 2010
    2010 Golf GTD (170) CBBB
    Stoke on Trent, England
    Just a quick point I see you using 15.7.1 which is 8 versions out of date. I don't know how you've done a scan on that as Ross-Tech don't allow you to use older version. VCDS Release 16.8.3

    VAG Error Code: 16855/001137

    EOBD II Error Code: P0471

    Fault Location:
    Exhaust Gas Pressure Sensor 1 (G450) - Range/Performance Problem/Implausible Signal

    Possible Cause:
    Malfunction Indicator Lamp (MIL)(K83) active.

    Hose from/to Exhaust Gas Pressure Sensor 1 (G450) faulty.
    Exhaust Gas Pressure Sensor 1 (G450) faulty/incompatible.

    Possible Solutions:
    Check/Replace all faulty Wiring/Connector(s).
    Check Hose from/to Exhaust Gas Pressure Sensor 1 (G450).
    Read Measuring Value Blocks (MVB).
    Check/Replace Exhaust Gas Pressure Sensor 1 (G450).
    Check Exhaust Gas Pressure Sensor 1 (G450) Compatibility.
    The new Exhaust Pressure Sensor must be calibrated with VAG-COM\VCDS.
    Exhaust Gas Pressure Sensor 1 (G450) values can be seen in the MVB-102.3 - actual pressure.
    This value must change when the throttle is 'snapped' (quick acceleration), if it does not the sensor could be faulty, you should check the sensor.

    Resetting Exhaust Gas Pressure Sensor 1 (G450):
    In Adaptation channel 083, save [0001] as new Value.
    Once the new Value has been saved, cycle the Ignition Off and wait about 10 Seconds, then turn the Ignition back On and have a look at MVB 102, field 4 is the offset.

    Special Notes:
    This Fault Code often indicates an incorrect/incompatible Exhaust Gas Pressure Sensor 1 (G450) being installed. VAG uses two different types of sensors, 076-906-051-A (formerly 03G-906-051-A) for Engines through MY 2009 and 076-906-051-B for Engines from MY 2010. If in doubt check the Part Number of the Exhaust Gas Pressure Sensor 1 (G450) and compare it against the Parts Catalogue.

    Tech Notes:
    Replacing the exhaust back pressure usually takes care of the problem.

    When is the code detected?:
    An Exhaust Back Pressure (EBP) signal that is detected out of range (high or low) by the Engine Control Module (ECM) will cause the engine to ignore the Exhaust Back Pressure (EBP) signal and disable exhaust back pressure operation.

    The Exhaust Back Pressure (EBP) sensor is a variable capacitance sensor that, when supplied with a 5-volt reference signal from the Engine Control Module (ECM), produces a linear analogue voltage signal that indicates pressure.

    The Exhaust Back Pressure (EBP sensor's primary function is to measure exhaust back pressure so that the Engine Control Module (ECM) can control the Exhaust Back Pressure Regulator (EPR) when needed.

    As taken from my new Free EOBD II Error Codes software

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