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Had my 2009 308 put into the diagnostic today and got 7 codes, mechanic changed the spark plugs so I could get on my way, the 2 fault codes I'm unsure of is
P2177 mixture regulation mixture too weak
P0170 mixture regulation coherence

Iv tried googling and can't understand what these mean. Thank you
 

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mixture regulation mixture too weak- this is probably generated by the exhaust sensors. Means not enough fuel/too much air.

mixture regulation coherence - some sort of malfunction in the injection system resulting in an incorrect air/fuel ratio.

It looks like the faults were intermittent/one off as the last line shows no faults.

These type of faults are often caused if you stall or almost stall the car. The revs stall instantly and the fuel supply does not react fast enough to the rapid change in air volume being sucked in.

It would also help if your car was being diagnosed by a PP2000/Diagbox system as generic readers do not perform 100% with Peugeots.
 
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