DPF removal and MOT test = fail?

[Backtobasics]

Morning,

Quick question for you all. With the new MOT structure do we know if removing the DPF will equate to an automatic fail or is it still just the smoke test going forward?

I've done a bit of digging on the net and it still appears non conclusive.

thanks.

[kambites]

As far as I know, it's just the emissions tests - same with a petrol and its cat.

[Backtobasics]

bump

[frosted]

No fail

[smartphone hater]

I think it will put the management warning light on which is a fail, or maybe advisory at the moment, not sure when it stops being an advisory & becomes an instant fail.

[47p2]

It won't fail for the DPF being removed but if in removong the filter it may throw a light on the dash it will fail.

Also when you remove the filter your car will throw out clouds of smoke and soot, best leave in place

[Panda76]

47p2 said:

It won't fail for the DPF being removed but if in removong the filter it may throw a light on the dash it will fail.

Also when you remove the filter your car will throw out clouds of smoke and soot, best leave in place

Nah it won't chuck out clouds of crap.Loads of people have had DPF removal jobs done when they have failed.
You can have the DPF taken off,internals removed,DPF put back on and car plugged in to turn warning lights off.

[Steve H]

The new MOT regs do include a provision that any original emissions kit must remain on the car, ie you cannot remove cats/DPFs etc. However, this is a visual test and so removing the internals and refitting the empty DPF box would generally be a pass, most cars will then pass a smoke test even without the DPF in place.

The new regs do not include a fail for engine management lights, there has been a lot of misunderstanding as the lights that are included (airbag, traction etc) have been referred to as MILs which is what the trade generally considers to be an engine management light but in fact refers to any Malfunction Indicator Light.

Having said all that, I'm pretty sure these new rules have not yet been added to the test as fail items, was supposed to be in April I think but it didn't happen, not sure why? Either way, the details could all change by the time they are properly on the test.

If you do remove a DPF in most cases the ecu will require remapping not only to avoid a light coming on but also as many of the cars will drop into a pretty severe limp mode reducing performance, PHers in mid-north Staffordshire can email me for details .

[Backtobasics]

Steve H said:

The new MOT regs do include a provision that any original emissions kit must remain on the car, ie you cannot remove cats/DPFs etc. However, this is a visual test and so removing the internals and refitting the empty DPF box would generally be a pass, most cars will then pass a smoke test even without the DPF in place.

The new regs do not include a fail for engine management lights, there has been a lot of misunderstanding as the lights that are included (airbag, traction etc) have been referred to as MILs which is what the trade generally considers to be an engine management light but in fact refers to any Malfunction Indicator Light.

Having said all that, I'm pretty sure these new rules have not yet been added to the test as fail items, was supposed to be in April I think but it didn't happen, not sure why? Either way, the details could all change by the time they are properly on the test.

If you do remove a DPF in most cases the ecu will require remapping not only to avoid a light coming on but also as many of the cars will drop into a pretty severe limp mode reducing performance, PHers in mid-north Staffordshire can email me for details .