What did you san the car with VAG-COM\VCDS or a generic scanner?

VAG Error Code: 16787/001027/4891/4892/7461/7462
EOBD II Error Code: P0403

Fault Location:
Exhaust Gas Recirculation (EGR) Recirculation Valve [N18] - Malfunction

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Rough Idle Speed and/or Engine stalling.
Loss of Power.

Fuse(s).
Wiring/Connector(s).
Exhaust Gas Recirculation (EGR) Recirculation Valve [N18] stuck/faulty.

Possible Solutions:
Check/Replace Fuse(s).
Check/Replace all faulty Wiring/Connector(s).
Read Measuring Value Blocks (MVB).
Check/Replace Exhaust Gas Recirculation (EGR) Recirculation Valve [N18].

When is the code detected?:
An improper voltage signal is sent to Engine Control Module (ECM) through the valve.

As taken from my new EOBD II Fault Codes Software

Limp mode: What is it, what are the causes, and how to fix it for the Audi and VW TDI diesel turbo

 

Its a generic tool although it is supposed to do VW and Audi and also has EODB mode. Nothing flagged by an EODB scan.

 

All generic scanners say all the VAG models but they don't give accurate results only VAG-COM\VCDS does.

 

The Autel MaxiDiag MD802 All Systems does a pretty good job. Can read all modules, live data, freeze frame, measuring blocks, EPB basic settings, Oil / Service resets and some adaptations. Not to mention all the ODB2 codes and some special functions of almost all other brands on the updateable SD card supplied. All for £95 (Amazon priced it wrong - went up to £200 a day after it was ordered). Average price £160 - £180.

Not exactly cheap (except for the Amazon error) as it is nearer VCDS prices but it's one of the closest diagnostic tools to VCDS I have come across so far to date. They just need to add full coding ability and it would be as good. Bit more portable than my laptop and covers all other cars we have hence why I bought it.

 

I don't have VAG-COM/VCDS.

If there is anyone in the Hants area that has a copy and would be prepared to run a scan that would be really helpful.

Apart from a scan are there any ideas of where else to look.

Grateful for any assistance as trying to avoid going to VW dealer for all the obvious reasons.

Thanks

 

Hampshire is a big county. The N18 controls the secondary vacuum actuator solenoid next to the EGR cooler and if I recall opens and shuts a flap / bypass valve on the cooler to alter the EGR cooling demand. There was almost certainly nothing wrong with your old EGR valve and this may be the culprit. Loss of vacuum (bad actuator diaphragm / vacuum leak) or stuck bypass flap the likely issue.

 

Yes - true enough - I'm in the Alton area of Hants.

Thanks for the pointer to the EGR cooler and its vacuum system - I will take a look.

 

With the same engine, we had a Golf 6 with the same fault code late last year. We had the car in and fitted a new EGR valve from Euro Car Parts as genuine were on back order for an unknown period, we fitted it and sent it out. About two weeks later it came back in with the same fault code so we replaced the EGR valve again with a Valeo unit again from ECP as they offered it to us a free upgrade, this failed before we could even get the car off of the lift!!!!! We knew that genuine EGR valves were impossible to find but Ryan at our local TPS pulled some strings and managed to get us one, star! The car was handed back (we put in a claim for labour) but whilst chatting to the owner I mentioned the recall. I said that under no circumstances should he have this do to which he replied "ohh that's OK, it was done a few days before the EGR valve failed"..........

 

Crasher,

Were unoriginal EGRs poor quality?
What was done to the car (as per recall?) few days before the EGR failed?
What was the recall about (not clear from the above, sorry)?

Are Pitsburg good (better than Valeo/ others? ) as a replacement to original ones? Noticed, it is Pitsburg from the factory in the car.

Thank you!

 

Valeo and alike are rubbish , Pierberg probably Genuine OEM but still fragile.

Software update will cause the egr to work 4x as much causing a whole host of problems .

 

Valeo and alike are rubbish , Pierberg probably Genuine OEM but still fragile.

Software update will cause the egr to work 4x as much causing a whole host of problems .

Do you mean the "diesel gate" software update?

Which could be a better alternative to Pierberg then?
The original one on the car is Perberg. A new original EGR from a dealer comes with a a piece of manifold - top price. Considering getting an OEM Pierberg from bebay. Is there a risk vs. original from dealer?

 

The EGR cooler is on the back of the engine and is extremely unreliable, more so on the 1.6 TDI than on the 2L. We are now replacing genuine units we fitted barely three years ago and VW are not interested as the warranty is two years. The recall regarded the stupid over blown so called Diesel scandal, it just made matters worse as the amount of EGR flow required went up and the unit could not cope. Aftermarket units ar a joke, in a few cases we fitted best quality Piebrug units as genuine were on long term back order, in two cases these failed within days and one did not even make it off the lift! If you want to visualise what an issue it is, a larger car parts supplier we use has 2735 in stock...

 

The EGR cooler inits on the back of the engine are extremely unreliable, more so on the 1.6 TDI than on the 2L. We are now replacing genuine units we fitted barely three years ago and VW are not interested as the warranty is two years. The recall regarded the stupid over blown so called Diesel scandal, it just made matters worse as the amount of EGR flow required went up and the unit could not cope. Aftermarket units ar a joke, in a few cases we fitted best quality Piebrug units as genuine were on long term back order, in two cases these failed within days and one did not even make it off the lift! If you want to visualise what an issue it is, a larger car parts supplier we use has 2735 in stock...

If i changed the EGR valve and it failed after 6 months, could it be as a result of the problem with EGR cooler? What is the way to diagnose the cooler?

The car is 2006 Audi A3 1.9 TDI BLS 207,000 km

I changed the EGR valve in April 2019 to Pierburg to find out that the problem was actually with wiring. The wiring coming from the ECM was damaged in one place (multiple wires insulation damaged). Few of the wires got temporarily fixed ... with a plan to change the whole wiring at some point. The old EGR was probably fine, but .. stupidly enough... i did not insist to keep it. The car drove like this fine for 6 months.

Two weeks ago, the car would not start. With few errors in the ECM and more in other modles in connection with ECM error (engine speed sensor, oil pressure sensor, EGR sensor, etc). Finally, the wiring got replaced with new original one. Errors erased, but the following still remained (car cannot start):
001619 - Sensor Reference Voltage B
P0653 - 000 - Voltage too High
Freeze Frame:
Fault Status: 01100000
Fault Priority: 0
Fault Frequency: 6
Reset counter: 255
Mileage: 207096 km
Time Indication: 0
Date: 2019.11.09
Time: 13:01:10

With the EGR valve disconnected, the car drives fine (just throws two EGR related errors in ECM). But at least it starts and drives.

Now the dilema is to replace the EGR again (as either a) possibly damaged as a result of issues with wiring or b) as unoriginal and pron to fault) or possibly look into the cooler condition. Cool cooler be the reason for EGR failing so soon?

Would appreciate your advice!

Thank you!

 

The car you have uses a completely different system to the later CR TDI, you need to start your own thread.

 

FrankyD - First posts normally go in introductions else you could get a free fix and we never see you again!!!

VAG Error Code: 17037
EOBD II Error Code: P0653

Fault Location:
Sensor Reference Voltage 'B' - Circuit High/Short Circuit to Positive

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

Wiring/Connector(s) short to positive.
Engine Control Module (ECM) harness is open or shorted.
Engine Control Module (ECM) circuit poor electrical connection.
Shorted sensor on 5 volt circuit.
Engine Control Module (ECM).

When is the code detected?:
The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is higher than expected.

As taken from my new EOBD II Fault Codes Software