When is a differential pressure sensor dead?

Hi,

[b]Which measurement values indicate that a G450 differential pressure sensor needs to be replaced?[/b]
Do you have offsets that are considered too large?
Or other, strange behavior?

Mine changes every day (sometimes 13, sometimes 9...), and yesterday it surprised me while the engine was off, with a differential pressure of 2 mbar.

We've already clarified that these things age over time, not operating hours. The new mounting location for the CRs, which is NOT on the engine but in a vibration-free location on the chassis, is also noticeable.

Hi,

for the Golf 6 with CR 2.0, the sensor is also mounted on the engine.
I received a new sensor after the differential pressure could no longer be changed.
See:
/viewtopic.php?t=25298
SG

[quote]Golf 6 with CR 2.0, the sensor is also mounted on the engine[/quote]

Do you have a photo of it?

I saw it on a Golf next to the engine!
m;

Has anyone ever swapped a sensor "on suspicion" and noticed any improvements?

I currently have sensors with 13 mbar, -9 mbar, and -15 mbar offsets in operation.

I think I'll get a new one and see what happens.

Until the differential pressure sensor failed, I was unable to detect any issues with my BRE.

Best regards, Rainer

... and the failure came suddenly and unexpectedly?
... and then the device no longer worked?

A weasel (from ASB) chewed through the hose from the DPF to the differential pressure sensor.

Even then, there was no noticeable change in the driving experience, only the engine warning light was on.

Hi dieselmartin,

here are the pictures, it took a while.
I need to improve myself, the sensor is mounted on the engine mount, not on the engine.
I had it wrong in my head. :oops:

Best regards

My sensor on the PD is also mounted on the spray wall.

In the image above on the left:
[img]http://stefan.localh0rst.net/albums/album02/IMG_0044.sized.jpg[/img]
I replaced it while cleaning the DPF just to be safe.

However, it had never been defective before.

After several years have passed, and the sensor seems to still be functioning, I noticed today that there should be a difference when the engine is stationary!

[quote]
Address 01: Engine Electronics (03G 906 018 EM)

16:06:22 Block 067: Particulate Filter (Exhaust Gas Values I)
106.5°C Temperature before exhaust turbine
102.3°C Temperature in the particulate filter
[color=red] 4.4 mbar Pressure difference particulate filter
[color]
-4 mbar Offset Differential Pressure

16:06:22 Block 068: Particulate Filter (Emissions Values II)
1.1 % Load coefficient
36.97 Ash mass
-12.8 % Ash removal rate

16:06:22 Block 073: Particulate Filter (Vehicle Data)
1.0 l Consumption since regeneration
21 km Distance since regeneration
0 h Time since regeneration
Yes, that means he always seems more full than he actually is

"Should" definitely not, the question is whether the small value has noticeable effects.

I had experienced a loss of communication after the measured 4.4 mbar.

The measurement with VCDS (later) showed the following:
Address 01: Engine Electronics (03G 906 018 EM)

20:58:13 Block 067: Particulate Filter (Emissions Values I)
26.8°C Temperature before exhaust turbine
24.4°C Temperature in the particulate filter
0.0 mbar Pressure difference in the particulate filter
-9 mbar Offset differential pressure

20:58:13 Block 068: Particulate Filter (Emissions Values II)
1.1 % Loading coefficient
36.97 Ash mass
-12.8 % Ash removal rate

20:58:13 Block 073: Particulate Filter (Vehicle Data)
1.0 l Consumption since regeneration
21 km Distance since regeneration
0 h Time since regeneration
Okay, hier ist die Übersetzung des Textes, wobei HTML-Tags, BBCode-Tags und URLs unverändert bleiben:

[/code]

What exactly does the offset do? Does it round up the 4.4...?

[quote="matthiasTDI96"]Was genau macht dieser Wert, hat er ja nun "gerundet" die 4,4 einbezogen...?[/quote]
That's what I thought too.
He had an offset of -4 and a falsely high value of 4.4.

To correct the measurement to 0, he must subtract 4.4 from the already calculated -4, resulting in -8.4 ~ 9 mbar.

However, I also had -13 mbar.

The offset fluctuates constantly... which contradicts the idea of "calibration".
After all, why do I have to log in to 3060... and calibrate the sensor, when it should already be providing constant values and the MSTG should automatically compensate?

... or should it not fluctuate at all, and therefore be considered "faulty" and in need of replacement?

Haha

Now, back to being so weird:
[code]
13:55:30 Block 067: Particulate Filter (Emissions values I)
60.8°C: Temperature before exhaust turbine
57.6°C: Temperature in the particulate filter
4.4 mbar: Pressure difference in the particulate filter
-9 mbar: Offset difference in pressure
d.h. es wird auf einen Offset von -13mbar hinauslaufen.

I think we'll get a new sensor next time.

Now, we've even seen readings as low as -16 mbar.
10:18:02 Block 067: Particulate Filter (Exhaust Gas Values I)
16.0°C Temperature before exhaust turbine
19.9°C Temperature in the particulate filter
0.0 mbar Pressure difference in the particulate filter
-16 mbar Differential pressure offset