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2015 (65) ST-2 TDCi 185ps Estate in Deep Impact Blue
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I believe this is the MAF on the ST Diesel. The diesel can be very fussy about it’s air intake, so if you have anything other than standard factory items, then best to revert back to standard parts first to see if it clears the problem, if not then best to use an OBD reader to get the DTC codes, that should help to pinpoint what’s causing the limp mode and EML to come on.
 

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Mk3 ST TDCI
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Hi I did have a aftermarket air filter but changed back to standard as it was happening alot more regularly
It’s weird, some diesels are bad for going into limp mode then there’s some with no issues whatsoever. The standard filter will be ok in there.

Off topic a bit but did you get round to fitting the dpf dummy pipe? I’m sure you were on about that before?
 
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