2011 Citroen DS3 error codes p0266 & p0269

There is a Technical Service Bulletin covering this

Combustion noise in the presence of one or more of the following fault codes: P0263, P0266, P0269, P0272

Symptoms:

Llighting up of the engine diagnosis lamp, Misfiring, Motor jerking, Excessive combustion noise in the engine.

Cause:
Noise reduction and correction of the injection nozzles out of tolerance.

Repair:
Querying of the error codes.
Replacement of the diesel injector (s).
Replacement of the noise insulation of the diesel injectors.
Parts Required
Diesel injection nozzles (part number depending on the vehicle definition) (quantity depending on the result of the check).
Centering rings (part number depending on vehicle definition) (quantity depending on the result of the check).
Diesel injector gasket (part number depending on vehicle definition) (quantity depending on the result of the check).
Support pins for fork (part number depending on vehicle definition) (quantity depending on the result of the check).
Flanges of the diesel injectors (part number depending on the vehicle definition) (quantity depending on the result of the check).
Screwing the flanges of the diesel injection nozzles (part number depending on the vehicle definition) (quantity depending on the result of the check).
High-pressure fuel lines (part number depending on vehicle definition) (quantity depending on the result of the check).
1 noise insulation (ET number 1982H2).
1 strand of fuel return lines (part number depending on vehicle definition).