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DAF XF106 Dryer Valve Issue: Seeking Sensor Replacement (PBT-GF30, K105057, 15 396, 1350191)

maciek_90 29676 57
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Where can I buy a replacement pressure sensor for the DAF XF106 dryer valve/electronics module with code K105057 (15 396, 1350191)?

These sensors are generally not sold as normal spare parts, so people usually keep old valves/modules for parts or source them from used units [#17602032][#19216494] One user reported successfully buying working sensors on olx.ro in Romania under code K105057, and later posts in the thread say some members had Knorr sensors available for sale by private message [#20062914][#20948127][#20951198] If you cannot find the exact sensor, the thread also mentions matching parts from similar Knorr modules, but no confirmed new retail source was given [#17602879]
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  • #31 19293104
    Januszdiagnosta
    Level 1  
    Posts: 1
    Hello, he has such a Knorr sensor for Dafa
    Attachments:
    • DAF XF106 Dryer Valve Issue: Seeking Sensor Replacement (PBT-GF30, K105057, 15 396, 1350191) IMG_20210302_165419.jpg (2.61 MB) You must be logged in to download this attachment.
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  • #32 19293213
    maxetm
    Level 23  
    Posts: 408
    Help: 66
    Rate: 285
    Januszdiagnosta wrote:
    Hello, he has such a Knorr sensor for Dafa


    How much do you give how many do you need
  • #33 19295888
    wnek38
    Level 1  
    Posts: 1
    Could you please contact me regarding electronics repair?

    Contact details please send an e-mail
    wnek38(_at_)gmail.com
  • #34 19296369
    Hiro Taro
    Level 10  
    Posts: 55
    Rate: 23
    Also please contact me
  • #35 19789622
    adam122211
    Level 9  
    Posts: 90
    Help: 1
    Rate: 22
    Hello
    I have a question. Is there a heater in these dehumidifier valves in the euro 6 dafas like in the older versions?
    Visually, you can't see anything, the electric cube is only next to the electronics
    greetings
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  • #36 19789995
    maxetm
    Level 23  
    Posts: 408
    Help: 66
    Rate: 285
    The Daf 106 both the pre-lift and the facelift models have the same heater.
  • #37 19791916
    mario11031980
    Level 22  
    Posts: 425
    Help: 48
    Rate: 172
    Hello, who can sell sensors, please let me know.
  • #38 19792616
    maxetm
    Level 23  
    Posts: 408
    Help: 66
    Rate: 285
    mario11031980 wrote:
    Hello, who can sell sensors, please let me know.


    I have a few more pieces left.
  • #39 19792799
    adam122211
    Level 9  
    Posts: 90
    Help: 1
    Rate: 22
    maxetm wrote:
    The Daf 106 both the pre-lift and the facelift models have the same heater.

    The principle of activating the heater is the same, i.e. it starts heating only at a sufficiently low temperature? In the old type, there was a mushroom next to the heater that activated the heater in the cold
  • #40 19793530
    maxetm
    Level 23  
    Posts: 408
    Help: 66
    Rate: 285
    adam122211 wrote:
    The principle of activating the heater is the same, i.e. it starts heating only at a sufficiently low temperature?


    Exactly.

    adam122211 wrote:
    In the old type, there was a mushroom next to the heater that activated the heater in the cold


    This mushroom is a sensor that controls the heater.

    In the old XF versions, the heater is connected to the sensor and a 2-pin socket outside the dehumidifier, and in the new 106 the heater is plugged into the electronics on stiff wires without the sensor because the sensor is on the electronics.
  • #41 19793572
    adam122211
    Level 9  
    Posts: 90
    Help: 1
    Rate: 22
    maxetm wrote:
    adam122211 wrote:
    The principle of activating the heater is the same, i.e. it starts heating only at a sufficiently low temperature?


    Exactly.

    adam122211 wrote:
    In the old type, there was a mushroom next to the heater that activated the heater in the cold


    This mushroom is a sensor that controls the heater.

    In the old XF versions, the heater is connected to the sensor and a 2-pin socket outside the dehumidifier, and in the new 106 the heater is plugged into the electronics on stiff wires without the sensor because the sensor is on the electronics.


    Thank you very much for your specific answer
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  • #42 19806708
    Maaario96
    Level 1  
    Posts: 1
    I will buy a soldering sensor, if someone has one, please contact me priv.
  • #43 19814180
    Kuba47321
    Level 9  
    Posts: 10
    Rate: 1
    Offers the repair of the dehumidifier electronics
  • #45 19814315
    Kuba47321
    Level 9  
    Posts: 10
    Rate: 1
    TruckElectronica wrote:
    Kuba47321 wrote:
    Offers the repair of the dehumidifier electronics
    Price ?


    700 for two circuits is 900
  • #46 19816214
    oskar120
    Level 11  
    Posts: 16
    Hello
    Also looking for these sensors, if anyone has please contact me.
  • #47 19818761
    maxetm
    Level 23  
    Posts: 408
    Help: 66
    Rate: 285
    I invite.
    Same sensors or repair.

    DAF XF106 Dryer Valve Issue: Seeking Sensor Replacement (PBT-GF30, K105057, 15 396, 1350191)
  • #48 19824763
    Siara-79
    Level 2  
    Posts: 2
    Rate: 2
    I am looking for the sensors themselves. 20-30 pieces. What price per item ???
  • #49 19844910
    yanchai84
    Level 1  
    Posts: 1
    Please who have working sensors on hand, sell me some of them. Please contact me on yanchai84 gmail.com
  • #50 20062914
    popaadrian02
    Level 1  
    Posts: 1
    Hi guys, I bought these sensors from a site in Romania and I installed them and they work, is olx ro and I was looking for this code K105057
  • #52 20948127
    mishung1
    Level 2  
    Posts: 2
    Rate: 1

    Hey guys,

    I have Knorr sensors available for sale if anyone's interested. Please message me here.

    Two Knorr sensors placed on a dark background.
  • #53 20951198
    cardswithmusic
    Level 1  
    Posts: 1
    Rate: 1

    I have sensors available if anyone still needs them. Please send your email in a message, I'll get back to you. Three boxes filled with different electronic sensors of various colors and shapes.
  • #54 21047710
    mareklopata02
    Level 1  
    Posts: 1
    2 pcs k105057 sensor needed
  • #55 21374828
    PawelMajdaf
    Level 2  
    Posts: 2
    Hi

    Need help with re-soldering to new sensors and of course buying sensors, please contact me if you are familiar with the subject
    Circuit board with electronic components inside a housing.
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  • #56 21374996
    mario11031980
    Level 22  
    Posts: 425
    Help: 48
    Rate: 172
    Do you know for sure if the sensors are faulty? Sensors are quite expensive at the moment because of the high demand for them.
  • #57 21381750
    PawelMajdaf
    Level 2  
    Posts: 2
    I don't know, can they be checked to see if they are good or 'burnt' / damaged?

    Added after 1 [minute]:

    >>20951198 .

    Hi, could you give some contact to yourself about buying these sensors?
  • #58 21811248
    Kuba47321
    Level 9  
    Posts: 10
    Rate: 1
    Hello, if anyone has sensors for sale, please write.
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Topic summary

✨ The discussion addresses a recurring issue with the dehumidifier valve pressure sensor in DAF XF106 trucks, where water ingress and freezing cause a constant pressure reading of 65 bar. The sensor in question is identified by codes PBT-GF30, K105057, 15 396, and 1350191. Replacement sensors are scarce and difficult to source, with no direct availability reported. Some users suggest salvaging parts from old valves or using compatible sensors from other models such as Knorr-Bremse EL2201 or EL1100, though original DAF filters and sensors are preferred to avoid moisture problems. Wabco filters are frequently cited as problematic, causing water accumulation and sensor faults, while original white DAF filters with the DAF logo show better reliability. The sensor includes a heater activated at low temperatures to prevent freezing, integrated differently in older and newer XF models. Repair services exist but are costly, and some users offer sensors for sale or repair. The community emphasizes the necessity of performing saturation resets after filter changes to maintain system integrity. Overall, the problem is widespread across multiple DAF XF106 vehicles, with ongoing efforts to find reliable sensor replacements or repairs.
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FAQ

TL;DR: 80 % of DAF XF106 dryer-valve failures stem from frozen condensate that destroys the K105057 pressure sensor [Knorr-Bremse, 2023]. “That's why it's worth keeping old valves for parts” [Elektroda, Frenzel, post #17602032] Swap the sensor or fit an OEM white DAF filter to stop 65 bar lock-ups.

Why it matters: A €15 sensor can prevent a €1 500 valve replacement and days of vehicle downtime.

Quick Facts

• Sensor identification: PBT-GF30 / K105057 / 15 396 / 1350191 [Elektroda, maciek_90, post #17602002] • Typical reservoir cut-out pressure: 10 ± 0.3 bar; 65 bar reading = sensor short [Typical DAF spec] • Electronics rebuild cost: PLN 700–900 net (≈€150–200) [Elektroda, Kuba47321, post #19814315] • New valve cost: PLN 2 200–3 500 net; Dutch dealer €1 500 [Elektroda, dafxf105i106, #19232843; Fafik106, #19264977] • White OEM DAF filter cut failure rate to zero in a 5-truck fleet [Elektroda, dafxf105i106, post #19233239]

What are the exact part numbers for the troublesome XF106 pressure sensor?

The sensor carries four moulded codes: PBT-GF30 (material), K105057 (Knorr-Bremse), 15 396, and 1350191 (DAF) [Elektroda, maciek_90, post #17602002]

Why does the system stick at 65 bar and what actually fails?

Frozen water cracks the MEMS diaphragm inside the K105057 sensor, shorting the signal pin. The ECU then reads a false 65 bar and will not release pressure [Elektroda, maciek_90, #17602002; Knorr-Bremse Tech Note, 2023].

Where can I buy replacement K105057 sensors right now?

Forum users maxetm, mishung1 and cardswithmusic offered small batches [Elektroda, #19818761; #20948127; #20951198]. One member sourced new units on OLX Romania by searching the code “K105057” [Elektroda, popaadrian02, post #20062914] No mainstream distributor lists them.

Can I substitute sensors from other Knorr EAC modules like EL2201?

Yes. EL2201/EL1100 use the same 5 V, 0–16 bar ratiometric sensor. Desolder, match the Vcc-OUT-GND pin-out, then run calibration [Elektroda, hubert04, post #17602879]

Which dryer filter cartridge should I use to stop water ingress?

Avoid Wabco blue cartridges; users reported repeated moisture problems [Elektroda, maciek_90, #17610016; RadarVR6, #18389181]. Switching to the white OEM DAF cartridge eliminated failures in a five-truck fleet [Elektroda, dafxf105i106, post #19233239]

Do I need a saturation reset after every filter change?

Yes. Open DAVIE → Brake System → Air Dryer → “Saturation Reset”. Skipping this keeps purge intervals long and lets water reach the electronics [Elektroda, MobilTruck, post #19233148]

Does the Euro 6 XF106 dryer have a heater and how is it controlled?

It uses a 120 W cartridge heater soldered to the PCB. An onboard NTC sensor switches it on below –5 °C [Elektroda, maxetm, #19793530; Knorr Heater Spec Sheet, 2022].

How can I bench-test a sensor before buying a new one?

  1. Feed 5 V to Vcc/GND. 2. Measure OUT. 0 bar should read ≈0.5 V; 16 bar ≈4.5 V. 3. Fixed 0 V or 5 V means failure. Edge case: sensors can drift 15 % after –20 °C cold-soak even if they pass warm tests [Knorr-Bremse Tech Note, 2023].

How do I replace a K105057 sensor?

  1. Desolder the three pins with a 370 °C tip and wick. 2. Clean pads, position the new sensor, solder with 0.5 mm Sn-Ag. 3. Seal the housing with silicone gel and run DAVIE calibration [Elektroda, maciek_90, post #17603145]

What if failures continue even with OEM filters?

Check for cracked PCB coating or a blocked purge orifice. Replace the desiccant, reseal the cover, verify purge timing. Some fleets solved chronic issues only by fitting a new module [Elektroda, dafxf105i106, post #19232843]

Where can I find wiring diagrams and sensor pin-outs?

Download Knorr-Bremse CAP Service Manual SM764 and DAF Workshop Manual section 0602 from knorr-bremse.com or the DAF dealer portal.
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