ESP is activating on its own. Help!

My colleague's 2001 Passat Variant has been independently braking for some time now, even during light cornering. It always brakes the right rear wheel.

I have read out using VAG-Com:

No errors saved.

Regarding the steering angle sensor readings, the sensor itself appeared to be functioning correctly, and it also displayed a reading of exactly zero when the vehicle was traveling in a straight line.

However, it was surprising that the values from the lateral acceleration sensor and the brake pressure sensor were constantly fluctuating strangely, even though the car hadn't moved at all.

The G200 and the brake pressure sensor are actually independent of each other, right?

Do you perhaps have any tips for a more accurate diagnosis?

What about the wheel speed sensors?

hehe jaja, I know. Just recently, I had the exact same problem.


/viewtopic.php?t=19526&highlight=rpm

(The error occurred much later, it started as you described)


My sensor was loose. Under the steering column. If this isn't the problem, replace the sensor. Are there cheap items on eBay?
In your trap, there might be another problem, but it is already a known defect.
.

Incidentally, the problem was that the ESP frequently interfered with the left-hand turn signals. This makes sense because it is mounted on the left side and the sensor would always detect movement even when there was none. Tightened and that's all there is to it.
By 2000, G200 + G202 should be together, except for 4-motion – at least that's what I read.



Greetings

Unplug the suspected source of the problem (the "giver"), and see if the problem still occurs.
"Although the ESP light is illuminated, the error (braking in the curve) no longer occurs."

I checked the sensors while driving.
They all display the same information and also have no glitches.
I think we should get a used dual sensor. That's probably the reason.
Does anyone know of any affordable sources?

Just sold one, too bad. But I'll check eBay, they're selling for €30-€150. Some are inside.
And to get rid of the thought of a new one at VW, it only costs 450, -

Too bad.

I already ordered a used one. 75,- €

Since some people here claim that the VW ESP (Electronic Stability Program) is useless, I asked my colleagues.

Up until the malfunction, he was definitely very satisfied with the ESP, and he had also attended a safety training course offered by ADAC.

Maybe the others should also get a new sensor, that might help.

I don't think it's that bad either. I wouldn't need one (with 5000 km per month in just one district), you get a good feel for your car, but maybe it could still be helpful...

Good luck, and let me know if the error is gone...

Hello,

Even though the thread is quite old, I also had the same problem. According to VAG-COM, the steering angle sensor. I replaced the sensor, and the error disappeared, but the ESP still interfered during cornering.

Since we were expecting snow, I immediately put on the winter tires. And lo, new tires, and the problem was gone.

I must also say that the summer tires would not have lasted a season.

Best regards, Markus

Hi,

p_u wrote:

Hello, Even though the part is quite old, I had the same problem. According to VAG-COM, the steering angle sensor. I replaced the sensor, and the error disappeared, but the ESP still interfered during cornering. Since we were expecting snow, I immediately put on the winter tires. And lo, new tires, and the problem was gone. I must also say that the summer tires would not have lasted a season. Best regards, Markus

The only reason I can imagine using different tire sizes/rolling circumferences would be for different diameters/rolling circumferences.
However, I have never tested whether differences like "one tire with 6mm tread depth", "other side with 2mm tread depth" could already cause problems here.

Best regards, Rainer

A "dent" in the rim and the resulting uneven running can also affect the ESP.
I have been experiencing ESP (Electronic Stability Program) activation frequently when driving quickly through left-hand turns, which seemed unusual. I also suspected that the sensors might be faulty.
The cause was the right front wheel, which was slightly unbalanced. However, while driving, you barely noticed this, only a slight vibration in the steering wheel at 120 km/h. With the winter tires, everything is now fine, the ESP is working as usual (not).

The summer tires themselves were not the problem; there was still more than 5mm of tread depth remaining.

So, we have now replaced the yaw rate sensor.

Unfortunately, nothing has changed, and the box is still braking on its own.

The steering angle sensor has been readjusted, and now it's tracking the lane one position better.

After that, I went to a friendly mechanic and asked him some questions. He said that he needs the car to read the error codes.

I already did that, and there's nothing in it! But he didn't seem to want to hear it.

However, he believed that it was actually just a wheel sensor.

These will probably be the next spare parts we need to buy.

Does anyone have any tips?

Are the wheel bearings okay?

Tobi76 wrote:

So, we've now replaced the yaw rate sensor. Unfortunately, nothing has changed, and the box is still braking on its own. The steering angle sensor has been readjusted, and now it's tracking the lane one position better. After that, I went to a friendly mechanic and asked him some questions. He said that he needs the car to read the error codes. I already did that, and there's nothing in it! But he didn't seem to want to hear it. However, he believed that it was actually just a wheel sensor. These will probably be the next spare parts we need to buy. Does anyone have any tips?

Hi,

How do the tires look?

Best regards, Markus

The tires actually look normal.

I would definitely not want to throw them away yet.

Interestingly, it seems the problem is actually related to the tires, as the error disappeared after the winter tires were installed.

Can anyone provide an explanation?

Hello,

regarding Tires, suspension, alignment (camber/toe),... all have an influence on the ESP.
The ESP system regulates the actual steering angle to the target steering angle. To do this, a single-track model (Ackermann) is always calculated. This model states that the following target steering angle should occur at this steering angle. Any deviations that exceed a certain threshold are corrected using braking torque interventions to generate gear moments, which aim to bring the actual gear ratio close to the target gear ratio.
The rate of greed is measured using a greed sensor (this part also contains the lateral acceleration sensor = sensor cluster).
The model has been "trained" specifically for a particular vehicle and identifies (based on measurements). This is done correctly. Suspension (new shock absorber, new rubber mounts, etc.), Tires (used tires, not brand new), accurately measured suspension.

Due to significantly different tire wear from front to rear, the vehicle can therefore be much more understeering or oversteering => meaning a one-way model no longer works.
Sometimes, even different tire manufacturers on the front and rear axles can show significantly different side forces, which is why it's important to consider. Are these also the old rubber bushings that are worn and misaligned, which will make the situation even worse?

Best regards
heizfoss