Po401

[Jetta Turbo]

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.

[Keithuk]

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

[Jetta Turbo]

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.

[Keithuk]

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

[Jetta Turbo]

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.