Question about 2006 Peugeot 405

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407 SW 136 diesel engine intermittent misfire/ hunting.

My 407 SW Peugeot diesel, 136 bhp, is now just over 3yrs old, having done about 70k miles. About 2 yrs or so ago it has developed an intermittent misfire/ hunting. The dealer that I bought it from has changed just about everything under the bonnet, including the turbo, but still the problem persists, playing hide and seek with me the driver, and the interrogating mechanic. I picked it up today from the garage and they are at a loss as to what is up, but it is showing an error message on the garage software. On the dialogue box when the fault really kicks in I get a message that reads 'De pollution system faulty', with the orange engine management light also coming on. This can all disappear the next day or next time the car is started even though, especially from cold the car is so jerky and lumpy, yet no fault is shown or the engine management light coming on.
Any ideas as to what can me the problem here...?

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The rear exhaust box has filter in it and the sensor is showing it as blocked ,which i think it could be as their is a problem with this model and it has been modified ,i would be inclined to just fit a rear box with no fancy filter and try to do something with the sensor as it will continue to throw up the light which means it will not pass its inspection ,now the dealer might not be inclined to change this box as its expensive i think about 700+euros the last time i had this problem i fitted a normal box and shoved a shunt resistor across the sensor terminals ,but i dont know what the resistor value was as i took a load of old resistors out of an old tv and i tried then one at a time till teh light stayed out ,i know it had a gold band on it but thats about all

Posted on Jul 30, 2010

  • martin May 07, 2012

    Hi I have a 407 myself with the exact same problem it is actually the mass air flow meter that causes the problem. Spent weeks trying to solve the problem. The fuel mixture was too rich.and over time it blocks up the system,and needs a good blow out you are left with a eggy smell then the car drives fine to the next time. It was an easy fix really just changed the mass air flow meter. Cost fifty quid and took 10 mins to do.

  • imran musa Jun 29, 2012

    ive just started getting same problem on my 407 below 2000 rpm the car jerks alot but over it runs fine



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