Comments on: Exhaust Gas Recirculation EGR System Hack on 1.6TDI engines

By: Frogeon

Frogeon — Tue, 25 Apr 2023 14:46:27 +0000

In my opinion... every EGR have different values. Just tested my new EGR and it has 0.96 - 4.00 The key is probably EGR adaptation... While adaptation process, ECU open and close valve, read and save voltage values and then use them to check EGR health. If any value goes over tolerance, then you get error. So before making this hack, try EGR adaptation first.
For sure, you don't need this hack for new EGR, just do EGR adaptation via diagnostic tools.

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By: Ronald

Ronald — Mon, 13 Dec 2021 08:27:59 +0000

Reference my last posting, my Seat Ibiza, 12 years old, diesel, with very low mileage a CAYC engine, how can I check the EGR valve PCB off the car?
Difficult access to EGR plug, is there another way to check the voltages?
Additionally the hose connections to the CAT, would compressed air down the vacuum pipes clear any dirt, carbon etc at the internal interface the CAT?
Great article anyway.

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By: Ronald

Ronald — Sun, 12 Dec 2021 21:03:57 +0000

Hello and thank you for a very informative article.
I had been searching for a long time for any possible fixes for the code P0407.
My engine is the same as yours, a CAYC, with 27500 miles.
My issues started with poor brake pressure, in other words the pedal went down, instead of being at the top.
After investigation I replaced the EGR vacuum solenoid, this solved the brake pedal height but not the flashing glow light and engine management light, but no.
Then after using an EGR cleaner, and a long drive the lights disappeared, but then after giving the engine a high speed run, the lights came back on and the DPF light.
So after running at 2000rpm, at 50mph the DPF light came off.
I then changed the Vacuum Solenoid for another after market version, this produced a lumpy idle and with pulsating acceleration.
I replaced with original which normalized running, but warning lights still on.
I then removed the EGR valve and found the pintile jamming and fouled with carbon etc. After cleaning the cooling chambers and airflow boxes and valve spindles all was now free and clean.
I checked the motor and applied voltage and the motor rotated normally.
I refitted the EGR valve, but the same issues applied, but there was more power but still no turbo.
I then checked the EGR and Turbo with a vacuum gauge and both held up and no air loss.
Next I replaced the Boost control valve, because the vacuum reading was low. But again no change or fix.
Yesterday I replaced the exhaust sensor for a Bosch replacement.
but fault code P0407 remained.
Not forgetting the Oxygen sensor which needed a clean but no change in the dash warnings.
The car is not in limp mode and only accelerates to 2800 rpm.
Overall a real mystery.
Could the map sensor be faulty or the DPF filter?
Looking at your hack as it were, this could be the ultimate repair, but for an engine with only 26000 miles on the clock, doesn't make sense.
4 years ago I received a letter from Seat with a software upgrade offer which I took up and the AA arrived and with a computer changed the ECU settings.
From that day the engine needed regular long runs to clear the DPF light. This letter I think was a response to the recent USA emissions debacle.
If anyone reading this article has any ideas on a repair please reply.

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By: FK

FK — Thu, 16 Sep 2021 14:48:57 +0000

Hello, great artical.
Can this trick be used with blanking EGR?

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By: Mirko

Mirko — Wed, 07 Apr 2021 11:22:33 +0000

In reply to Khalid.

Hello, I've read now your comment, I have exactly the same problem. P046C error on cold start below 5°C... Have you found a solution? My EGR is brand new (1000km of life).

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By: Corse

Corse — Thu, 25 Feb 2021 09:32:24 +0000

Bonjour
Christian, la perte de puissance vient de l’actionneur du RGE entre la cosses 2 et 6 faut que sa une résistance 0.0 ohms passer cette valeurs le défaut p40800 apparaîtras
====================================
Hello
Christian, the loss of power comes from the RGE actuator between terminals 2 and 6 must have a resistance of 0.0 ohms to pass this value the fault p40800 will appear

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By: RudLee

RudLee — Mon, 16 Nov 2020 14:43:28 +0000

Hello.

I have some strange things going on.

Between pin 3 and pin 5 multimeter is showing 0. Tested with 2 different multimeters and both the same.

i have constant CEL about P0408 error and sometimes it goes away for 1 -3 days sometimes it stays only with cold engine and now it is constant error mentioned above.

Do you have by any chance wiring diagram and pinout from ECU to G212 valve? maybe some wires are broken been searching for two days with no luck!

Really like DIY stuff but now i am backed up in corner and its its hard to drive 1.6tdi in city with emergency mode on.

Thanks

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By: Radu Nicolae

Radu Nicolae — Mon, 27 Apr 2020 11:53:32 +0000

In reply to SK.

Hi, how did u managed to reset learned values. I tried but nothing happens, can u pls give us more details, I'd rather prefere the soft approach instead of modifying the PCB.

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By: Evis

Evis — Sat, 04 Apr 2020 07:16:52 +0000

Thanks a lot Christian Adzic, your post are very helpful for everyone

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By: Khalid

Khalid — Sun, 24 Nov 2019 19:12:59 +0000

Hello Christian and thank you for very good info.
I have the same car Skoda octavia 1.6 tdi 2012 and i got error code P046c only when the weither is very cold let us say 0 degree or under that! when it is warmer i get no error code att all! what do think can be the reaseon?
Thank you in advance.

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