Dear All,

My friend's 530d estate is flagging up a Particle Filter warning (reduction in power, have problem checked by BMW) on the SatNav display.

The vehicle has done 107K miles and in the service information it states that the particle filter is not due for replacement for another 27K miles time.

There are no fault codes set. We have requested the vehicle carry out a regeneration on the next drive cycle, however it's failing to regen. The car has a full tank of diesel, and when taken for a drive the engine coolant temperature is 85C and the exhaust temperature anywhere between 280 - 350C so when driven on the motorway there appears to be no reason why it won't regen.

Unless the filter is already too blocked? Looking at the exhaust pressure values at idle the reading is 38mBar and at 2500 rpm it rises to 187mBar. I suspect these figures are too high and the filter really needs replacing but would like to hear what the BMW experts feel. Customer is happy to have the DPF replaced (with a non-genuine one at £600) but would have expected a least one or two fault codes to be set.

Is there anything I'm missing or can check? As far as I know you can't do a static regen on these BMWs....well I've not found the option on the BMW GT1 tester!

Thank you for your time.

Regards

Sean