Peugeot 406 showing faults P1138, P0101 and P0191.

I own a Peugeot 406. The engine cut out whilst driving; fault was diesel pressure sensor. Replaced sensor. Engine diagnostic light on again and the car has gone into limp mode. Took it to the garage. Codes found - P1138 fuel pressure regulator stop requested regulator still active. P0101 air flow meter regulator too low. P0191 fuel pressure regulator sensor consistency, fuel regulator current and present. Test for faulty components and none found.

Picked it up from the garage drove it home and this morning it gives a little cough and I'm back in limp mode. Any ideas?

Asked on 29 September 2012 by Captain Pug

Answered by Alan Ross
Well code P0101 is saying that either you have a Air intake blockage ( ie check the air filter/hoses)or that the MAF (mass air flow sensor) is faulty.
P0191 is saying that the Fuel rail pressure sensor is faulty.
Would check out the MAF first ,then the FRP sensor after that.
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