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Daf 105 460 Engine Warning: Reducing Power, Fuel Temp Sensor & Filter Issues on 1600km Route

Kazor26 21159 12
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  • #1 16702378
    Kazor26
    Level 9  
    Hello, I have a problem. Daf on the 1600 km route displayed a warning engine in red about 7 times and lost power but there was no warning about the loss of power. The computer sintering was caused by errors from the fuel temperature sensor. I exchanged it and then the same goes on from time to time pressure filters, etc. Ok. There are no errors in dmci but in the ebs there were no mistakes Canu jaltest does not show which one. Interlocking tight. Someone will tell me what a problem may be
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  • #2 16702709
    serwis33
    Level 11  
    Hello - the problem can be with fuel pressure
    check the actual fuel pressure with the pressure gauge. You do it by turning the fuel pressure sensor and connecting the manometer. The pressure should be about 5 bar at idle. If it is not, or "wavers" from 1 to 2-3 bar, replace the feed pump.
    EBS will not reduce power. greetings
    ps check also if the "Christmas tree" in the fuel filter housing is not damaged.
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  • #3 16703126
    Kazor26
    Level 9  
    I think that if the pump would sit it would not be pressure and the computer would indicate 5 bar. Jaltest always shows it well. There are no saved errors in dmci here. The filter and the basis of the new spring in the arm removed the lichen I have no idea what to take
  • #4 16706619
    serwis33
    Level 11  
    Hello. As for the fuel pressure and temperature sensor, it has "made me into a horse" several times. Check that the pressure stays constant at 5 bar or if it changes after adding gas. If it keeps "rigid" the sensor is damaged.
    I suggest you go to someone who has a DAVIE and do a fan test and test the performance of the cylinders, unless jaltest can do it. greetings
  • #5 16712094
    Kazor26
    Level 9  
    The pressure jumps around 5 bar is also ok. But it arrived and the errors are further away from the temperature and pressure sensor A it is New. Here, I rather do not put up for the installation: / the error turns on and goes off while driving or is it possible that a new duplex sensor?
  • #6 16712176
    kisiol
    Level 20  
    Maybe there is some glitch in dmci, or some software error. It must be that dmci is not unreliable, but appearances are wrong.
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  • #7 16713205
    serwis33
    Level 11  
    Hello, when it comes to pressure and temperature sensors, in the last month I exchanged 3 or 4 (new), and DAF included the complaint! Try to replace the sensor with another car. Regarding errors - are there only errors in the pressure sensor, or temperature and pressure?
    Last week I fought with DAF, who did not want to go, and made big blue eyes when it turned out that there was a piece of plastic in the tank that blocked the fuel. Look into the tank, maybe something floats on the bottom. I'm honest
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  • #8 16713246
    Kazor26
    Level 9  
    The temperature and pressure sensor error appears. Power supply 5v has, apropo fuel I have already looked at everything today I replaced the fuel filter and separator on the original. Because there was a mistake too low pressure. Zaworek in arm pulled out to be honest I did not have such a case. It will replace the sensor as you handled me, the car will fly on the route and we'll see I'll know. I did a road test with a computer that you know on the wheel of 5 and when we were driving 6 .6.5 and it did not catch a bad error. Well, let's see if this is not my next step, it will be a power pump because maybe something "takes" it already
  • #9 16713805
    szy18
    Level 14  
    in my dafa an error of low fuel pressure appeared in the course of about 950,000 km. 2-3 times a week. but the pump was already falling because the pressure in the idle gear was jumping from 1 to 2 bars. after replacing for a new 4-5. if you have 5, you have a pump.
  • #10 16716494
    serwis33
    Level 11  
    Hello
    I agree with "szy18" - if there is a pressure of about 5 bar, the feed pump is efficient and does not need to be replaced. If you have the option to do this, test the performance of the cylinders, you can deduce from it whether something happens with the unit pumps and injectors. greetings
  • #11 16732886
    Kazor26
    Level 9  
    Hello. I replaced the fuel filter and separator with original dafoski and everything hula. I also warn you how you want to save money on fuel filters, but it does not go. Apparently their bandwidth is different
  • #12 16734310
    serwis33
    Level 11  
    Hello, and where did the non-original fuel filter and separator come from in your car? There is so much "crap" on the market now that I only assemble original filters and sealants in DAFs. greetings
  • #13 16739361
    Kazor26
    Level 9  
    I close the topic
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Topic summary

✨ The discussion revolves around a recurring engine warning in a Daf 105 460 truck during a 1600 km route, characterized by power loss and issues related to the fuel temperature sensor and filters. Users suggest checking the fuel pressure, which should be around 5 bar at idle, and recommend replacing the fuel pump if pressure fluctuates significantly. Several participants mention the importance of using original fuel filters and sensors, as non-original parts may lead to further complications. There are also suggestions to perform cylinder performance tests and check for blockages in the fuel tank. The conversation highlights the challenges of diagnosing intermittent errors and the potential for software glitches in the diagnostic systems.
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FAQ

TL;DR: DAF XF 105.460: 5 bar idle fuel pressure is normal; "EBS will not reduce power." Intermittent warnings often trace to filters, feed-pump pressure, or a faulty fuel temp/pressure sensor. [Elektroda, serwis33, post #16702709]

Why it matters: This FAQ helps drivers and fleet techs quickly diagnose power-loss warnings on long routes with practical, road-tested steps.

Quick Facts

What usually triggers “engine warning” and power loss on a DAF XF 105.460?

Most cases trace to fuel supply issues: restricted filters, unstable feed‑pump pressure, or a faulty combined fuel temperature/pressure sensor. EBS faults do not cause power reduction here. Start by confirming a steady ~5 bar at idle and inspecting filters. [Elektroda, serwis33, post #16702709]

How do I check fuel pressure correctly on this engine?

  1. Remove the fuel pressure sensor and tee in a calibrated manometer.
  2. Start and observe idle pressure; target about 5 bar steady.
  3. Blip the throttle; pressure should remain stable, not swing 1–3 bar. [Elektroda, serwis33, post #16702709]

What is the normal fuel pressure at idle for the DAF 105 460?

Expect about 5 bar at idle. The reading should hold steady, both at idle and with light throttle inputs, when measured with a mechanical gauge at the sensor port. [Elektroda, serwis33, post #16702709]

Does an EBS error reduce engine power on the DAF 105?

No. As one expert put it, “EBS will not reduce power.” Power loss warnings in this thread tied back to the fuel system rather than the braking electronics. Focus diagnosis on filtration, feed pressure, and the dual temp/pressure sensor. [Elektroda, serwis33, post #16702709]

My new fuel temp/pressure (duplex) sensor still throws errors—can it be bad?

Yes. Multiple brand‑new sensors were reported defective and replaced under complaint. Swap in a known‑good sensor from another truck to A/B test before chasing wiring faults. Intermittent on/off errors while driving match this failure mode. [Elektroda, serwis33, post #16713205]

When should I replace the feed pump?

Replace it if pressure can’t hold near 5 bar at idle or “wavers” in the 1–3 bar range. A steady 5 bar indicates the feed pump is healthy and does not need replacement. Verify with a mechanical gauge rather than only scan‑tool data. [Elektroda, serwis33, post #16702709]

What are the symptoms of a failing feed pump on high‑mileage units?

At around 950,000 km, users reported low‑fuel‑pressure warnings 2–3 times per week, with idle pressure jumping between 1 and 2 bar. After replacing the pump, idle pressure returned to 4–5 bar and faults stopped. [Elektroda, szy18, post #16713805]

Can aftermarket fuel filters really cause derate or warnings?

Yes. One owner fixed recurring warnings by replacing non‑original filters and the separator with OEM DAF parts. Different media bandwidth can restrict flow and trigger low‑pressure faults under load. Use OEM filtration on this platform. [Elektroda, Kazor26, post #16732886]

What is the “Christmas tree” in the fuel filter housing and should I check it?

It refers to a plastic insert/stack in the filter housing. If damaged, it can affect fuel flow or sealing. Inspect it during filter service when diagnosing pressure anomalies or intermittent power loss. Replace if compromised. [Elektroda, serwis33, post #16702709]

Could debris in the fuel tank cause intermittent power loss?

Yes. A small plastic piece in the tank blocked fuel intermittently on one truck, causing severe performance issues without clear ECU faults. Inspect the tank with a lamp and remove any floating debris. [Elektroda, serwis33, post #16713205]

DMCI shows no errors—what should I do next?

Software can miss intermittent supply faults. Perform live tests with DAVIE or a capable tool, including cylinder performance and fan tests, while monitoring mechanical gauge pressure to correlate events. [Elektroda, serwis33, post #16706619]

What diagnostic tools are mentioned (Jaltest, DAVIE), and what do they do?

Jaltest and DAVIE are multi‑system diagnostic platforms used to read faults and run tests. In this thread they were used to view live fuel pressure, run road tests, and perform fan/cylinder checks during diagnosis. [Elektroda, serwis33, post #16706619]

How do I differentiate a sensor fault from a real pressure problem?

If a mechanical gauge shows steady ~5 bar while the ECU logs pressure/temperature faults, suspect the duplex sensor. Quote: “If it keeps ‘rigid’ the sensor is damaged.” Swap with a known‑good unit to confirm. [Elektroda, serwis33, post #16706619]

What quick fixes helped others clear the warning on long routes?

Replacing non‑OEM filters with original DAF filter and separator restored normal operation and stopped warnings. Ensure all fuel‑line connections are tight and air‑free after service before testing under load. [Elektroda, Kazor26, post #16732886]

Any edge cases to remember during diagnosis?

A brand‑new duplex sensor may be faulty out of the box, and debris in the tank can intermittently starve the system without stored DMCI errors. Check both before authorizing major parts. [Elektroda, serwis33, post #16713205]

Should I rely only on scan‑tool readings for fuel pressure?

No. Validate with a calibrated manometer at the sensor port. Scan‑tool values can mislead when the sensor itself is failing or drifted. Trust the mechanical reading for decisions. [Elektroda, serwis33, post #16702709]
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