Fabia 6Y - MOT failed :(

Hello everyone, I'm having a problem with my wife's car. He had to go to the TÜV (technical inspection agency), and he failed the initial technical inspection.

The examiner said he wouldn't be able to achieve the standard score. I've already cleaned the throttle body, as it was very dirty.



Can VCDS be used to check if the vehicle would now pass the emissions test?



Where should I look to troubleshoot these two errors?

Quote:

17559 - Bank 1; Mixed adaptation area 1. P1151 - 35-10 - Lean limit exceeded - Intermittent. 17584 - Bank 1; Lambda correction after the catalytic converter. P1176 - 35-00 - Limit reached

The car's diagnostic scan shows several errors, as the power windows on both sides have also stopped working.

Sometimes the key isn't recognized by the WFS. So, please don't be surprised.



"Thank you in advance."

Hello,

Take a look at this:
I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.
Okay, I'm ready. Please provide the German text you want me to translate.

If the engine is running too lean, it can be caused by the following:
- Air intake manifold leak (vacuum leak), easily testable by spraying a small amount of brake cleaner or similar onto it. Warning: Do not use this to wash the engine, as it poses a fire hazard!
- low fuel pressure.
- clogged injector(s)

Best regards, Rainer.

What exactly is the problem with the AU?

I'm not aware of a specific threshold value for the automatic unit (AU), but rather a test of the so-called control loop. A disturbance is introduced, and the MSG (Material Safety Group) must then detect it and adjust the values accordingly. The same applies when the disturbance is removed.

The entire process can be carried out using two half-cycles, one half-cycle, or alternatively, using an alternative method.

The simplest thing would be if you could upload the document from the AU, then people can see it.

An AU (without OBD II) test can be passed even with error codes present, and it's also possible to fail the test even if the error memory is empty.

Thank you for the quick responses.

I'm not entirely sure what he said.

"I believe he wouldn't adjust towards a value of 1, but only around 0.91, and he needs to adjust towards 1," said the technician.

I haven't received the AU report. He told me to focus on getting it working again first, and then to contact him again (and I haven't paid anything yet).

Can I check the maintenance work order (MWO) to see if everything is okay?

Just took the car for a spin and gave it a little more "gas," accelerating from 20-120 km/h, and then the engine light came on again.

This time, I found two new bugs. (See photo).

Furthermore, I found a hose that is defective.
(see above) (Photo)

Could that mean something?

If you have a leak in the vacuum hose for the brake booster, air will be drawn in. Take a look at what's at the other end; it's probably the intake manifold. And that would throw the lambda regulations into disarray.
hg
Herbert.

Okay, I think I'll try again with the TÜV.

Replaced the vacuum hose, cleared all error codes, and set the readiness codes using VCDS.

Everything is fine, I think it should work now, right?

Best regards.

blauerwolf4 wrote:

So, I think I will try again with the TÜV. Replaced the vacuum hose, cleared all error codes, and set the readiness codes using VCDS. Everything is fine, I think it should work now, right? regards

If no more errors occur because something else is still broken, yes.

I would always have a conventional vehicle inspection done at a workshop, and never by a testing organization. The inspectors usually just follow a predetermined inspection procedure; if everything works out the first time, you're lucky, but if the values are not correct, you fail.

There are many ways to influence the testing process in order to pass the medical examination, such as ensuring adequate physical fitness.

Here we go again with that problem child...

The last few days have been good, until Thursday. I was planning to go to the TÜV (technical inspection) in the afternoon, and of course, something had to happen.

In the morning, the engine light came on again .

17559/P1151/004433 - Bank 1; Mixture adaptation area 1: Lean limit exceeded.

The same old problem, but I've now realized that the issue only occurs when you give the little thing a bit of gas (by pressing the accelerator pedal).

Okay, I've now deleted the error and wanted to reset the readiness codes, but unfortunately, I'm having trouble with the lambda sensor.

If I do this according to these instructions.

Checking the aging of lambda probes.
-Select ad group 034.
-Generate 2 gas pulses above 5000 RPM.
-Set the speed to 1500-3900 RPM.
-Maintain the speed until the indicator in field 4 changes from "Test Off" to "Test On".
- Continue running the motor at this speed until the display "B1-S1 OK" appears in field 4. That might take some time!

Bitte gib mir den deutschen Text, den du übersetzt haben möchtest.

Then I can maintain the speed for about 15 minutes, but it remains stuck on "TEST FAILED," and then I get the error message.

"Does anyone have any other ideas about what I could do?"

Thank you and best regards.

PS: I've already tried using brake cleaner, but I didn't notice any difference.

Hello.

Quote:

17559/P1151/004433 - Bank 1; Mixture adaptation area 1: Lean limit exceeded. Again, the same old problem, but what I've now noticed is that the error only occurs when you give the little one a bit of gas by pressing the GAS pedal.

So, if the fuel consumption is high, then not enough power can be delivered. Have you checked the most obvious things, like the fuel filter and the tank ventilation?

Quote:

P.S. I already tried using brake cleaner, but I didn't notice any difference.

That's good, then the intake manifold is sealed.

Okay, please provide the remaining text you would like me to translate.
Okay, I understand. Please provide the German text you want me to translate into English. I will only provide the translation.
Please work through the aforementioned points.

Best regards, Rainer.

Have you replaced the oxygen sensor before?

Rüdi wrote:

Have you replaced the oxygen sensor yet?

Theoretically possible that it's measuring incorrectly. But: Usually, when...

Quote:

...when you give the little one a bit more power by pressing the GAS pedal.

The engine runs richer, or the lambda control is completely deactivated. That's exactly where blauerwolf4 is having problems.
That wouldn't really indicate a faulty oxygen sensor causing incorrect lambda values, would it?

Best regards, Rainer.

Lambda sensors are known to be wear items that last for varying periods of time.

If I'm experiencing issues with the closed-loop control and receiving an error code related to it, that suggests the problem lies in that area.

I assume that the intake and exhaust areas are 100% sealed.

Considering the cost of a branded probe and the relatively limited effort required to replace it, that would be my first approach.

He has the TÜV and AU .

Fuel injectors removed, cleaned, and reinstalled.

I checked the lambda values with VCDS, then went to the TÜV (technical inspection), and everything was fine .

Thank you for the information.

Thank you for the feedback .