Results 1 to 5 of 5

Thread: Po401

  1. #1
    Junior Member
    Join Date
    Nov 2019
    Posts
    8
    Post Thanks / Like

    P0401

    Hi.

    I did a search but did not find an answer to my query. I got a 2006 diesel VW Jetta 1.6 TDI auto ( on log book) but insurance company says it's a 1.9. Anyway need a few answers if possible. I wont make this long or drawn out, so i will basically number my problems.

    1) CEL permanently on.

    2) Scan shows P0401 - egr insufficient flow. No other codes showing.

    3) Car was rough idling/smelly exhaust.

    4) Had a hydrogen system clean to clear carbon deposits. ( 2 hours) and codes cleared, including CEL.

    5) Used injection system cleaner.

    6) ran car for advisory 150 or so miles.


    Also
    7) If i do 2 miles it shows i done 5/10 miles on the "fuel mileage counter on the OBC" and does not reset itself. clearly a problem there.


    About 60 miles or so, the CEL come on again and stayed on. Exhaust is not so smelly now and drives really smooth and quieter after the flush out.

    Any ideas will be appreciated why CEL came back on and Incorrect fuel count on OBD

    Thanks.
    Last edited by Jetta Turbo; 08-11-19 at 01:03.

  2. #2
    Administrator Keithuk's Avatar
    Join Date
    Jun 2012
    Location
    Stoke on Trent
    Posts
    14,458
    Post Thanks / Like
    As I've said in your intro they don't do a 2006 Jetta 1.6 TDI. Recheck your logbook?

    VAG Error Code: 16785/001025/4807/7337
    EOBD II Error Code: P0401

    Fault Location:
    Exhaust Gas Recirculation (EGR) System - Insufficient Flow Detected

    Possible Cause:
    Malfunction Indicator Lamp (MIL)(K83) active.
    Reduced Exhaust Gas Recirculation (EGR).
    Reduced Power Output/Engine running rough.
    Increased Emissions.

    Wiring/Connector(s).
    Hose leak/blockage.
    Exhaust Gas Recirculation (EGR) Flow restricted/clogged.
    Exhaust Gas Recirculation (EGR) Valve stuck closed/leaking/faulty.
    Exhaust Gas Recirculation (EGR) System faulty.

    Possible Solutions:
    Check/Replace all faulty Wiring/Connector(s).
    Check/Clean Exhaust Gas Recirculation (EGR) System.
    Read Measuring Value Blocks (MVB).
    Check/Replace Exhaust Gas Recirculation (EGR) Valve.
    Control deviation < limit from map f (engine speed, desired airflow).

    Special Notes:
    When this fault is stored in a 2009-2012 North American Region (NAR) market 2.0L CR TDI (CBEA, CJAA, CKRA) VW Jetta/Golf (1K/AJ) or the NMS Passat (A3) chassis:
    Please see: Technical Service Bulletin (TSB) 26-13-03 | Technical Product Information (TPI) #2031583/3 (formerly know as 26-12-08 | Technical Product Information (TPI) #2031583). When the Exhaust Valve Control Module (J883) is faulty, the engine controller may have any of the following Diagnostic Trouble Codes (DTCs):
    P046F, P0477, P048A, P048B, P048C, P0401.
    Some TDI-CR engines have a filter for the Exhaust Gas Recirculation (EGR) that can become restricted and cause a "Insufficient Flow" code.

    When this fault is stored in a 2009-2014 North American Region (NAR) market 2.0L CR TDI (CBEA or CJAA ) VW Jetta/Golf (1K/AJ).
    Please See Technical Product Information (TPI) 01 14 11 | #2034898
    May also have fault code stored in Engine Control Module (ECM).
    009315/P2463/009315 - Diesel Particulate Filter (DPF) - Excessive Soot Accumulation.
    Restrictions in the Exhaust Gas Recirculation (EGR) Filter may occur after a regeneration, if the soot loads where high before the regeneration.

    Tech Notes:
    Exhaust Gas Recirculation (EGR) flow malfunction could be caused by a clogged Exhaust Gas Recirculation (EGR) valve or Exhaust Gas Recirculation (EGR) tube. Before replacing any parts try cleaning the Exhaust Gas Recirculation (EGR) valve, tube and passages.

    When is the code detected?:
    Restrictions in the EGR Filter may occur after a regeneration, if the soot loads where high before the regeneration.

    As taken from my new EOBD II Fault Codes Software
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  3. #3
    Junior Member
    Join Date
    Nov 2019
    Posts
    8
    Post Thanks / Like
    Thanks for the reply. I checked my logbook and it states 2006 VW Jetta S TDI 1.6 diesel auto. Also the code reader showed 1.6 too. Waiting for a reply from DVLA.
    2006 Jetta 1.9 TDI-PD, DSG

  4. #4
    Administrator Keithuk's Avatar
    Join Date
    Jun 2012
    Location
    Stoke on Trent
    Posts
    14,458
    Post Thanks / Like
    Quote Originally Posted by Jetta Turbo View Post
    Thanks for the reply. I checked my logbook and it states 2006 VW Jetta S TDI 1.6 diesel auto. Also the code reader showed 1.6 too. Waiting for a reply from DVLA.
    Which code reader a generic one or VAG-COM\VCDS?

    As I've said they don't make a 2006 Jetta 1.6 TDI, that's only for later models.

    Manufacturer: VW, Date(s) Used: 06/2009-07/2014, Model: Jetta, Engine Code: CAYC, 77Kw, 105PS, 1.6 Ltr, 4 Cyls, Remarks: Turbocharged Direct Injection Common Rail (TDI-CR) 16v Timing belt
    Manufacturer: VW, Date(s) Used: 12/2009-10/2010, Model: Jetta, Engine Code: CAYB, 66Kw, 90PS, 1.6 Ltr, 4 Cyls, Remarks: Turbocharged Direct Injection Common Rail (TDI-CR) Timing belt

    Manufacturer: VW, Date(s) Used: 01/2005-04/2007, Model: Jetta, Engine Code: BRM, 74Kw, 103PS, 1.9 Ltr, 4 Cyls, Remarks: Canada ("CDN") USA ("USA"): Turbocharged Direct Injection Pumpe Düse (TDI-PD) Timing belt
    Manufacturer: VW, Date(s) Used: 09/2005-07/2006, Model: Jetta, Engine Code: BKC, 77Kw, 105PS, 1.9 Ltr, 4 Cyls, Remarks: Turbocharged Direct Injection Pumpe Düse (TDI-PD) 8v Timing belt
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  5. #5
    Junior Member
    Join Date
    Nov 2019
    Posts
    8
    Post Thanks / Like
    The code was read by the VW dealership near me and my mechanic. Both were done using a laptop and not a handheld generic reader, that's all i know really, But my insurance company said 1.9 when they checked.
    2006 Jetta 1.9 TDI-PD, DSG

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •