I have a 2008 Ford Focus (UK) with a 1.6 TDCi engine and 60K miles.
This weekend I got error code P242F stating "diesel particulate filter restriction ash accumulation" and the vehicle has gone into limp mode.
I first had the same error a few months ago and was fortunate enough to be able to clear it using my OBDII tool and a 'hi-rev' journey up and down the motorway. Unfortunately I'm not as lucky this time and I'm seemingly stuck with the error for now.
What's interesting is that at first the yellow check engine light shows and the red screen on my dash displays the "engine malfunction" warning sign. If I use my OBDII tool at this point it says "1 error code found" and shows P242F.
If I try to clear the code the yellow check engine light disappears and the tool shows 0 codes, but the warning screen still shows and the car is still in limp mode. After a day it goes back to the first stage again.
I've been doing a lot of reading to see if there's anything I can do myself before taking it to a garage and the general advice seems to be as follows:
- Clean the EGR valve (some recommend blanking or replacing it).
- Temporarily disconnect the MAF to clear the error code.
- Force a DPF regen using something like FORScan.
My problem is that I'm not 100% confident as to where these two parts are located and I've been unable to locate any documentation on this.
Here is a picture of my engine with the cover off. I've circled what I believe is the EGR valve, you can just see its barcode sticker in the picture (zoomed in):
- Is this the EGR valve? If not, where is it?
- The advice seems to unanimously be to blank it. Is this legal? I couldn't find any UK/EU law on this.
- Is this the MAF? If not, where is it?
- Is it safe to disconnect the MAF temporarily?
- Any other suggestions to try before contacting Uncle Ford?
I should mention that I'm a computer guy rather than a mechanic, so while I'm very confident in my technical ability to follow some instructions and "repair" these parts I'm not familiar with some terminology so go easy on me ;-)
I've tried to get some better photos but the light was terrible today (UK weather).
As requested, the engine with no labels:
I'm confident that I've correctly identified the EGR valve based on the photos, but confirmation would be great.
EGR Valve (top of picture):
I think @Paulster2 might be right about the MAF. I've taken some photos of what I think is the inlet for it, but it's so dark I'm not sure if you can see:
Actually, I've just found a YouTube video detailing cleaning the MAF on an '08 Focus and it seems I wasn't far off!