Ford Focus 1.6tdci - Juddering & now in Limp mode

[Woody3]

My Sister has a bit of an issue with her car.

She was heading along the M1, cruising around 70mph. Then all of a sudden it started to judder/hesitate ("kangarooing" she says). Every time she pressed the accelerator, she heard a fluttering noise coming from under the bonnet.

Anyway, she got off at the next junction, where it went into Limp mode. Red light on dash saying "Engine System Failure"

It's now sat on my drive. There was no smoke apparently or anything else unusual.

Any thoughts?

Car is a 2006 1.6tdci with circa 102k miles on the clock.

[Woody3]

Thanks BlackST.

Plugged in the computer today and it is indeed reading DPF Filter Blockage. Oh the joys of EU emissions.

Any idea what options she's got or is it a case of replacing the filter at a crippling cost? The fluid was only topped up last year as well.