Depollution system fault, Peugeot 307 HDI
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  1. #1
    Tadpole
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    Default Depollution system fault, Peugeot 307 HDI

    We are the unfortunate owners of a Peugeot 307 XS HDI 1.6L 5 door hatch. This vehicle has had a persistent depollution system fault since it was 3.5 years old. 18 months later and after 4 different mechanics (2 of which were Peugeot dealerships) and the outlay of $4,000 we are no closer to resolving this fault.

    When this fault occurs the computer limits the power of the engine when accelerating (puts it into limp mode) and shuts the engine down intermittently - e.g. when taking off from traffic lights.

    Various diagnoses and repairs have occurred over the 18 months including: numerous fuel filter changes, fuel injector change (@ $2,500), fuel tank removal and clean, regeneration of burn off canister, and our favourite (which we didn't do) was the replacement of the "faulty" fuel pressure sensor in the fuel pump.

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    Has anyone else had this problem and had it successfully resolved? If so how?

  2. #2
    Fellow Frogger! 908HDI's Avatar
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    Welcome to the Forum ! Sorry to hear of your troubles.

    I would suggest cleaning / changing the EGR valve. [ EGR = Exhaust Gas Recirculation ]

    A diesel specialist is the way to go. They can also test the vaccum operation of the EGR with a simple vaccum pump and guage.

    The tell tale sign of the EGR valve playing up / blocked is a more audible low exhaust note when accelerating.

    I am affraid that today's Diesels just have too much plumbing that gets blocked up. You can ofcourse have the emission components removed or bypassed.
    Last edited by 908HDI; 6th September 2011 at 12:26 AM.

  3. #3
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    Yes, had this problem in our 2.0L HDi.
    It was the exhaust pressure sensor in our case. Not sure if that is the same thing that 908HDI mentioned above.

    I had a thread on it prior to the AFF crash, but same symptoms as yours. The car would show the depollution system faulty message, then a few days later go in to limp home mode where it wouldn't rev over about 2000rpm from memory. Never had the engine shut off though, just rev limited.

    Thankfully, our was covered under warranty and happened a few years ago.

  4. #4
    NRK
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    Default 307 fault

    Hi Wendy

    Phone Magic at 0432 493 376, the best I know of thoroughly recommended

  5. #5
    Fellow Frogger! jurgen_s's Avatar
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    problem might also be in the sensor that is in the opening of the fuel cap. Each time you open the fuel cap to fuel your car, a sensor triggers this, releases a small amount of Eolys (that helps to clean your particle filter).
    EGR might be a problem. Let somebody look into the tube that goes from the egr to the inlet manifold. If this is heavely clogged than your problem comes from there.
    Bypassing the egr can only be done electronically. Manually blocking or bypassing it will only result in more error messages.
    www.peugeotforum.be
    Belgium Peugeot Club

  6. #6
    Fellow Frogger! 908HDI's Avatar
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    This is a good clip on the EGR valve on the 307 HDI.

    http://www.youtube.com/watch?v=Xm9uSaDQmuo
    Last edited by 908HDI; 6th September 2011 at 10:19 PM.

  7. #7
    Tadpole
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    Thanks to everyone who responded to my thread. You couldn't imagine how much better we feel now that we have something to work with - and we have called Magic/Matic? and are taking our car into him. Perhaps this depollution fault will disappear for good this time - and we'll even keep the car. Who knows!? I'll write back once he's diagnosed the fault and let you know what it was. BIG THANK YOU!

  8. #8
    Tadpole ozzie_freddo's Avatar
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    Default Solution to Depollution problem

    We had the same problem and (long story including many visits to service centre, towing, a Northern NSW dealer "fix" that lasted 10km, 2 rental cars via Peugeot Assist, stuffed holiday, lots of misinformation etc) an eventual fix by the experts at the Albury Peugeot dealer.

    In the exhaust there is a particulate filter (put there to reduce the traditional black cloud that comes out of a diesel exhaust) that periodically gets clogged. When it is clogged, the computer injects some magic stuff (from a bottle under the back seat) into the exhaust to burn off all the gunk...wouldn't want to be driving behind you when this happens (perhaps every few thousand kilometers).
    This system is called "depollution".
    To detect when the filter purging is needed, there is a tube either side of the filter and these are fed off to a differential pressure sensor. Obviously when the filter is clean there is not much difference between the two pressures. As the contamination builds up the blockage makes the pressures different and the sensor requests a "burn-off".
    The trouble is that the pressure differential sensor is in a position that its electrical connector gets splashed with water off the road and its terminals are affected by this. There was a suggestion that this is a legacy of the conversion to left hand drive.
    This poor connection is detected by the car's computer and it reports it as "depollution system faulty" and tolerates it for a while but eventually gives up and goes into "limp-home" mode.
    Limp home mode happens without any warning and is quite dangerous in that it doesn't announce itself and you suddenly have very reduced power. When you know about it you can make some progress on the open road but you really can't use auto and you have to drive it manually to get the most out of the limited revs and fuel available. In that mode you certainly wouldn't contemplate overtaking and hill climbing is similar to that of a heavily laden truck.
    Fortunately our problem was diagnosed 2 days before our warranty ran out as the repair called for a replacement sensor.
    Last edited by ozzie_freddo; 14th December 2011 at 11:34 PM. Reason: typo

  9. #9
    Tadpole
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    Dragging up an old thread, Aussie-Freddo has provided a good summary here, but there's an important trigger that I think needs clarifying

    The cable to the differential pressure switch may be vulnerable in water crossings but it quite high and normal road splash is not the problem. It is dripping from above - the air conditioner tubing that attracts moisture when it is cold. There is a device on the piping right above the DPS that inadvertently causes the water droplets to fall, right into the cabling that controls the DPS. I also noticed a pool of water on the rear of the battery tray from the same source

    There is a small plastic tube that is supposed to pushed into the noise suppression lining that appears to try to drain this water away. This tube is easily knocked out, or not replaced, when changing the battery or the cabin air filter.

    Water runs along the cable and into the connector, corroding the pins, and failures occur. It's only when you unplug the DPS that this corrosion is visible.

    Once I cleaned out the plug, I pushed silicone grease into the back of the plug to stop water ingress and also put some plastic sheeting over the DPS to guide this water away, another over the back of the battery.

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