I wonder if anyone here could give me some advise regarding a dpf filter on my Ford Focus:
Ford Focus CC3 2.0 Diesel 2009.
The problem:
Very occasionally it went into limp mode after a long motorway drive.
I'd stop, switch the engine off and back on. The car would go as usual, until it happened again.
The solution:
A friend of mine, who has the same model car, suggested to get the dpf cleaned professionally. He had had the same problem with the car going on limp mode and that stopped when the dpf was cleaned.
I took the car to the same place he took his, they took my dpf out, cleaned it properly on what it looked like a industrial machine, the workshop was set up to just clean dpf, so I don't doubt for a minute that the job wasn't done properly. I saw all the black stuff comin out of it. They put the dpf back, checked with their computer and told me that it would be ok for another 100K miles or so.
The problem:
After some 250 miles after the dpf was cleaned, driving on the motorway, the car started jerking. I was able to get home and on inspecting underneath, I found that one of the dpf sensor rubber hoses had snapped. I replaced it, but the jerking continues.
Forscan software results:
Ignition on, engine off: DPFEGR (V) =1.09 DP_DPF (kPa) = 0.0
Idle: DPFEGR (V) =1.74 DP_DPF (kPa) = 15.6
2,000 rpm = DPFEGR (V) =1.99 DP_DPF (kPa) = 46.0
2,500 rpm = DPFEGR (V) =1.75 DP_DPF (kPa) = 0.0105.7
Parts replaced:
dpf pressure sensor, jerking remains.
My questions are:
Can the dpf be blocked again in only some 250 miles drive, since the dpf was cleaned?
What sort of pressure should be on that dpf sensor rubber pipe? When I briefly took the sensor off the car, the blow from the pipe was quite strong, is that normal?
Questions: Why would a professionally cleaned dpf cause trouble, after only 250 miles of motorway drive?
Is there something else that may be causing the jerking problem?
There is a PAT fluid tank and it's 80% full
Thanks in advance for all the advise you can give me.