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I’m not an expert, I’ve just had similar problems. My guess is that at the start, the 3” hole in your boost pipe gave you the P0101 code and put your car into limp mode (MAF and DPF were probably fine). Once in limp mode the car no longer regenerates the DPF, so it’s just a case of time (miles...

Wow, thanks for the detailed response and info and sorry for the delay in responding. Interesting that you're seeing other garages not doing the forced regens, maybe it's the time it takes, or the noise / smoke bothers their neighbours or something? I think some cars need to be driven to do...

Did that sort your problem? Sounds like a likely cause of these error codes and the sluggish acceleration problem.

They charged £70, I think this was a little less than normal as they could only get it down to 130%.

Unable to get rid of the P0101 code myself even after fitting a new MAF and clearing the codes, I took it to an indie garage. They had the Mercedes Star system and said that new MAF sensors need to be “adapted” to the car using Star. So they did the ‘adaption’ for my new MAF sensor and the...

I reset the codes, checked that they were cleared and engine light off, then drove with the MAF disconnected. I don’t think I waited for 5 mins, does that make a difference? I got the same soot code back straight away and another 2 codes relating to the MAF “circuit high” and inlet air temp...

Just in case it helps anyone else, Green circled sensor = Mass Air Flow (MAF), blue circled sensor = Manifold Absolute Pressure (MAP) and the red device is a crankcase breather heater.

I’ve been looking at the live OBD2 data and the Absolute Throttle Position is always 87.8% and the Relative Throttle Position is always 100%, but I assume these are fixed as this is a diesel so it doesn’t have a throttle controlling air into the engine as a petrol does, is that correct?? There...

Thanks for the replies, unplugging the MAF gave me 2 new codes, 'MAF input high' and 'air temp sensor input high' which I guess are the 2 codes you are referring to. Car seems to drive ok without the MAF, but I haven't driven it far yet. My new MAF sensor arrived from Germany, I fitted it...

Hi, no problem. m80 has the same P0101 code as me so it may be related? When you say the exhaust back pressure sensor, are you talking about the DPF differential pressure sensor? I had that error about 1.5 years ago, but the error was that specific sensor (not a MAF error), I replaced the DPF...

Hi, thanks for the reply. Yes both codes come back as pending as soon as I start the car after clearing the codes, then after a day or so the light is back on and the codes are back. I’ve only got a basic OBD2 tool so can’t read the soot content. I don’t know if the soot code happened first...

[Moved from the Engine section] Hi, I’ve spent 2 days testing and searching on the web and haven’t been able to find an answer and I’m hoping someone here may be able to point me in the right direction – I’ve signed up specially! I have the below 2 fault codes on a 2011 W204 C220...

Hi, would this be better in the Electronics section?

Hi, I’ve spent 2 days testing and searching on the web and haven’t been able to find an answer and I’m hoping someone here may be able to point me in the right direction – I’ve signed up specially! I have the below 2 fault codes on a 2011 W204 C220 BlueEfficiency CDI on 165k P0101 - Mass or...