VW 1.6 TDi CR CAYB 2010 - P040700 Exhaust Position Sensor Error: Causes, Solutions & Wiring Diagram

Hello everyone, I have a problem with the VW 1.6 TDI CR 66kW engine, engine code CAYB, 2010. The engine and exhaust gas purification indicator lights come on. the computer registers the error code: P040700- Exhaust position sensor (signal too low). In autodata, this code is described as P0407 - EGR valve position sensor B (input signal too low) - possible causes: short to ground, EGR sensor, controller.
The installation looks ok EGR valve replaced with a new one and the problem is the same.
Does anyone have a diagram of this engine and check values of components or has dealt with this problem???
Thanks in advance.

You replaced the EGR assembly for almost 2,000 and are just looking for help?

Go to the specialist who told you to replace it and advertise the service

Not long ago in Skoda with this engine I had exactly the same error, and after replacing the EGR unit, the problem disappeared.

a more reasonable solution is a complaint and someone wiser (i.e. us ) egr off

First you would have to DPF off and then EGR off, because the filter will not last long.

i.e. convert the car into "made for Poland" he he

The problem is probably in the controller and just removing the filter and egr will not do anything because there will still be a Christmas tree in the clocks and emergency mode.

And never in your life, if you throw out the egr and dpf support from the software, what will the Christmas tree and emergency mode be?

dafit906 wrote:

And never in your life, if you throw out the egr and dpf support from the software, what will the Christmas tree and emergency mode be?

"Magic of crashing", we start with bringing even a short-term car to order. All elements that remain active after the "offs" must be operational. It's one thing.
The second is to perform "off" EGR or FAP is, unfortunately, 80% shoddy tinkering on our market, performed without a clue about what is going on under the hood.

jurek, I confirm, but my post #4,6,8 is offtopic because we know very well that this is how these matters are handled in Poland. However, I agree 115% with you that the car must be brought to its original condition with working components, including, among others, egr. The fact that 80% of this type of OFFs in Poland to druciarstwo I also agree because looking for 2 minutes at uncle google programs such as egr remover or some volta or ecusafe etc. you can throw yourself out so much that later the problems start only. Only "manual" work is profitable and 100% correct, ie WinOls or Swiftec, but not everyone can afford it. OK, end of OFFtopic. MCS look for problems in the wires, in some controllers there is also "learning" the correct egr position. Plug in e.g. VCDS and see if sometimes there is no such function

ok thanks more or less that's what I mean, I don't have access to vcds but Bosch's kts does not have such a function

and autocom? because kts is kts It depends if someone updates it

Only the originals are available, the error crashes right after firing, it can be erased but immediately returns. Burning the filter filter was done twice, but it does not help. I don't have a schematic for this engine, if anyone has it, I would be grateful. And it would be best if someone already dealt with this topic in this engine and let me know if he gave advice and what it was. Tomorrow I may have time to check the installation more thoroughly.

In this engine, I replaced the EGR together with the exhaust gas cooler, half a day of work, the error did not return.

The fault occurred at 71,000 km.

Hello, I have probably the same problem in my 1.6 TDI 77 KW Seat Ibiza 2010, 103 thousand km.
The rule is that I always switch on the emergency mode when the engine is cold, but when the engine warms up (after about 10 km), the error disappears (after turning off the engine) and the car works like a dream. I connected the ELM to the car and it shows me the error code P0407 "EGR Sensor B Circuit Low".

In addition:
- I cleaned the EGR (there was some soot there, but not terribly much).
- My EGR is electrically (not pressurized) controlled.
- If the error is to pop up, it is rather happening when trying to accelerate (load on the engine) and not after starting the engine at idle.

Guys, is anyone here having this problem?
What do you advise to do?

Fox-1969 wrote:

What do you advise to do?

Make sense of this car.

ELM in this car can be useful as a wedge under the wheel, when you catch a slipper and you will have to jack up so that the car does not roll....

If the error is confirmed and the EGR connector at the bottom behind the engine is clean and securely fastened, get ready for replacement.

For you, this may be the beginning of the end of the EGR assembly.

APPROX. thanks for the quick reply.
- anyone have a hypothesis how to explain that everything is OK on a hot engine?

Fox-1969 wrote:

- anyone have a hypothesis how to explain that everything is OK on a hot engine?

Problem with the connectors, either on the links or in the EGR actuator itself or in the engine controller.

The egr actuator itself jams, sometimes it helps to wash, start and lubricate this actuator under the black plug. By the way, what kind of ram put the egr there, everything needs to be thrown out..

dabu wrote:

By the way, what kind of ram put the egr there, everything needs to be thrown out..

Not ram, the whole accounting staff, they produced something that even 100,000 won't last, and the service calls almost two thousand for the replacement, plus PLN 1,500 for the module ...

In Altea XL 2011 1.6 CAY B or C I had exactly the same.
The EGR was to blame. Cleaning, calibration, replacement with a used one (identical!) did not give any result.
Replaced with a new one and problem solved. Everything is due to the potentiometer on the EGR valve.