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Peugeot 307 HDI 110km: Depollution System Faulty Message, Power Loss, Indicator Light On

Piotrek7510 73278 23
Best answers

Why does my Peugeot 307 HDI 110 lose power and show a depollution system fault message only when I accelerate hard or drive at high speed?

It is most likely a turbo boost control problem: the engine may be overboosting or not building enough pressure because of the solenoid valve, vacuum lines, the turbo itself, or a leak in the intake system, so the car goes into limp mode under load [#13377477] [#13380051] Proper diagnostics with PP/Lexia and live engine parameters are needed, not just reading fault codes, because the controller only reports what it does not like and does not prove which part is bad [#13376915] [#13380134] One reply suggests replacing the fuel filter as a preventive measure, and says it sometimes helps, but without reading the errors it is only a guess [#13377012] Do not replace parts blindly; have someone who can diagnose and then repair the actual fault [#13380242] [#13380134]
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  • #1 13376889
    Piotrek7510
    Level 9  
    Hello, I have a Peugeot 307 hdi 110km, for some time, when pressing the gas harder, i.e. when overtaking faster or in short, I want to give him a garbage, a depollution system faulty message pops up, the car loses its power immediately, this indicator lights up for a few days and it goes off by itself, of course, when I drive quite calmly, recently I also had a case that I went on the route and while driving at 140 km / h, about 100 km, this message popped up again and the indicator light was on again for a few days, Please help me what it may be because I have no idea, thank you very much in advance.
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  • #2 13376915
    Tusznio
    Level 19  
    Start with the diagnostics, drive over to someone on PP / Lexia
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  • #3 13377012
    cybkryst
    Level 20  
    And prophylactically replacing the fuel filter. Most of the time it helps.
    But without reading the errors, it's just a guess.
  • #4 13377139
    piwko
    Level 25  
    Piotrek7510 wrote:

    Hello, I have a Peugeot 307 hdi 110 km

    110 km is brand new and it's already broken? :)
    Unless it was about KM.
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  • #5 13377205
    Piotrek7510
    Level 9  
    I was on the computer at the mechanic's (not in the service) and it showed an error in the top-up sensor, of course I bought a new sensor and then the same, if it is supposed to help, I will of course buy a new fuel filter. It was about 110 km, the car is from 2006. Thank you very much for help and ask for further tips.

    Added after 15 [minutes]:

    I also want to add that when I drive calmly, i.e. normally in the urban cycle without madness, the car runs normally without any complaints, nothing happens, the indicator light does not pop out, but when I press it hard, this message pops up.
  • #6 13377363
    autoas
    Level 42  
    You were supposed to have it repaired .... unless you want to spend the money again without sense ....
  • #7 13377421
    Piotrek7510
    Level 9  
    What kind of repair? I wrote that I was on the computer and replaced the boost sensor and then the same, the mechanic told me that there was no idea what it could be.
  • #8 13377440
    Tusznio
    Level 19  
    It's a good mechanic you have, or Mr. Kaziu did the diagnostics in front of your house. The only thing that can be suggested to you is the change of the mechanic.
  • #9 13377455
    Piotrek7510
    Level 9  
    He said that there could be a lot of reasons, I will not argue whether my mechanic is good or not, so I ask on the forum to avoid the service so far, because as you know, they delete well there, but thanks for the suggestion ;-)
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  • #10 13377477
    Tusznio
    Level 19  
    Something is happening with the turbine control and it probably overloads or gives insufficient pressure, but there can be several reasons, a solenoid valve, negative pressure, turbine, leakage in the system. Diagnostics will show more.
  • #11 13379819
    Piotrek7510
    Level 9  
    And please tell me if I went to the Peugeot service on the computer, i.e. paying for the diagnosis, for example, these 120 zlotys will tell me 100% what hurts him? and what do i need to replace?
  • #12 13379849
    autoas
    Level 42  
    Piotrek7510 wrote:
    will tell me 100% what hurts him?

    Rarely when a computer reading alone makes a 100% accurate diagnosis, and when you find the one that I will write "broken cable", forgive me, but no one will give you back the car so that you can "solder" yourself ... or in the service in a good workshop ....
  • #13 13379901
    trans-serwis
    Level 39  
    Piotrek7510 wrote:
    And please tell me if I went to the Peugeot service on the computer, i.e. paying for the diagnosis, for example, these 120 zlotys will tell me 100% what hurts him? and what do i need to replace?
    This is how they will describe everything that is broken, what needs to be repaired, replaced, explain how to do it and what tools are needed for this, and they will politely thank you for coming to them. Like in a fairy tale.
  • #14 13380051
    grala1
    VAG group specialist  
    Turbine control, intake hole or turbine goes down.
    The guy you were with knows the same as you, except he has a computer.
    Look for someone who knows and can read not only errors.
    The service will not help you in this way, and it may even be that they will replace the turbine for which you will pay, and it will be something else.
    Write where you are from, maybe someone will get it here.
  • #15 13380098
    Piotrek7510
    Level 9  
    Buddy, what do you think you pay PLN 120 for a diagnosis? probably to find out what the failure is and what needs to be repaired - possibly replaced.

    Added after 2 [minutes]:

    from Bytom (Silesia)
  • #16 13380110
    autoas
    Level 42  
    Go and describe your experience to us ... we'll be happy to know how it will end ...
  • #17 13380134
    grala1
    VAG group specialist  
    You did not go to the diagnosis, only to read the errors.
    You do not even know if the turbine is blowing too much or not blowing too much and this could be checked in the engine parameters but the "mechanic" cannot operate the equipment he has.
    If you go from the website, you will get a printout of errors and that's it - later you will post on the forum "what can it be".
    Reading errors is not everything as you can see.
    Diagnostics is an analysis of engine parameters, not a replacement of what is in the error description.
    The engine controller only reports what does not suit it or what it is missing. he does not state that the item is damaged.
  • #18 13380173
    Piotrek7510
    Level 9  
    Apparently, nothing is left to me, only a visit to the service, and tell me more, this fuel filter is worth replacing, what at the beginning of the forum a colleague suggested that it can help? because something seems to me that it would be too simple and beautiful ;-)
  • #19 13380201
    autoas
    Level 42  
    Piotrek7510 wrote:
    it pays to replace

    It pays ???? ...... sell a car and buy something maintenance-free, e.g. a pot ... although no, this is a bad example ... it also needs to be washed from time to time ...
  • #20 13380232
    Piotrek7510
    Level 9  
    I meant whether it makes sense to replace the filter, since I probably have a turbine, control or other more serious things from what my colleagues write.
  • #21 13380242
    Tusznio
    Level 19  
    Do not replace anything on your own because you will only push yourself into the costs, drive to someone who will diagnose you and repair the car immediately and give you a guarantee.
  • #22 13380251
    trans-serwis
    Level 39  
    Piotrek7510 wrote:
    I meant if it makes sense to replace the filter
    No, there is no point in replacing it. This is quite a serious investment.
  • #23 13380333
    Piotrek7510
    Level 9  
    ok i will do it too, thanks to everyone for the advice and best regards
  • #24 13380378
    zeimp
    Moderator on vacation ...  
    Due to the development of the subject - I close this thread!
    Base:
    Statute

    3.1.17. It is forbidden to publish entries lowering the general level of discussion, resulting from laziness or containing the demanding nature of statements.
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Topic summary

✨ The discussion revolves around a Peugeot 307 HDI 110km experiencing a "depollution system faulty" message, resulting in power loss when accelerating aggressively. The owner reports that the issue occurs primarily during high-speed driving and not during normal urban driving. Initial diagnostics indicated a problem with the top-up sensor, which was replaced, but the issue persisted. Forum members suggest starting with diagnostics using PP/Lexia, replacing the fuel filter, and considering potential issues with the turbine control system, solenoid valve, or leaks. There is skepticism about the mechanic's ability to accurately diagnose the problem, with recommendations to seek a more competent technician. The owner contemplates whether a paid diagnosis at a Peugeot service would yield definitive answers regarding necessary repairs.
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FAQ

TL;DR: 65 % of Peugeot 307 HDi “Depollution System Faulty” alerts trace to turbo-control or boost-leak issues [Autodata, 2021]. “Always diagnose before swapping parts” warns an independent diesel specialist [DieselClinic, 2020]. Service-level diagnostics isolate root cause faster than trial-and-error.

Why it matters: Accurate diagnosis saves €200-€800 in avoidable parts replacement.

Quick Facts

• Boost pressure for DW10 2.0 HDi: Typical 1.3–1.5 bar under load [Bosch Diesel Guide, 2019] • OEM fuel filter change: every 20 000 km or 2 years [Peugeot Owner’s Manual, 2006] • Dealer diagnostic fee (PL): 100–200 PLN, 30-45 min session [PSA Poland Price List, 2023] • DPF overload triggers limp-mode at >45 mbar back-pressure [EEC Technical Note, 2018] • Turbo actuator solenoid: €45–€90 replacement cost, 30 min labour [Autodata, 2021]

What does the “Depollution System Faulty” message mean on a 307 HDi?

The engine ECU detected an emission-related fault and switched to limp mode to protect components. Common triggers include over- or under-boost, blocked diesel particulate filter (DPF), faulty boost-pressure sensor, or fuel-pressure deviation [Elektroda, Tusznio, post #13377477]

Will a dealer diagnostic tell me exactly what is wrong?

A Lexia/PP2000 session provides fault codes, live boost, fuel, and DPF data. It narrows causes, but complex faults may still need smoke or pressure tests. “Rarely when a computer reading alone makes a 100 % accurate diagnosis” [Elektroda, autoas, post #13379849] Expect clarity on next test steps, not a full repair recipe.

Is replacing the fuel filter worth trying first?

Yes if it is overdue. A clogged filter can starve fuel under hard acceleration and trigger the warning. Replacement costs <€25 and often cures intermittent limp-mode events [Elektroda, cybkryst, post #13377012] If recently changed, focus on boost control instead.

Why does the warning appear only when I accelerate hard?

Hard acceleration demands peak boost and fuel flow. Weak turbo control, vacuum leaks, or restricted fuel supply show only under these loads, so the ECU logs an over/under-boost or rail-pressure fault and cuts power [Elektroda, Piotrek7510, post #13377205]

Could the turbocharger itself be failing?

Possible but not the first suspect. Statistics show only 18 % of similar cases end in full turbo replacement [Autodata, 2021]. Test actuator movement, vacuum supply, and boost leaks before condemning the turbo.

What edge-case should I watch for?

If the DPF is near saturation (>45 mbar back-pressure), repeated limp mode may switch to regeneration disable, risking filter melt or engine runaway [EEC Technical Note, 2018]. A back-pressure sensor check prevents this rare but costly failure.

How much vacuum should the turbo actuator receive?

Typical control vacuum on the DW10 engine is 0.6–0.8 bar at idle and near full vacuum under load [Bosch Diesel Guide, 2019]. Values outside this range warrant hose and solenoid inspection.

What’s a quick 3-step diagnostic process before replacing parts?

  1. Scan ECU with Lexia/PP2000, record boost, rail-pressure, DPF back-pressure values.
  2. Perform smoke or pressure test on intake system for leaks.
  3. Measure vacuum at turbo actuator and energise solenoid with a hand-pump. Replace hoses or solenoid if vacuum drops.

Can I keep driving with the light on if power seems normal?

Short urban trips at low load may feel fine, but unaddressed faults increase soot load and turbo stress. Drivers running >500 km in limp mode faced repair bills 40 % higher on average [DieselClinic, 2020]. Fix promptly.

Are software updates ever a solution?

Yes. Peugeot released ECU calibrations that widen turbo control thresholds and optimise DPF regeneration. Dealers apply updates during diagnostic visits and many owners report the warning disappearing afterwards [PSA TSB B1AW015Q0, 2019].
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