1.4 HDi engine occasional 'missfire' P0129 and P0339

If you have a Tip or Trick, some advice to give or you just want others to know something that is Specific to the a Diesel Citroen C3, please, post it here.
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Model: C3 2002-2005, Original shape model
Year: 2002 (52)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 100000
Trim Level: Exclusive
Gearbox: Manual 5 speed
Engine name: DV4 16-valve diesel (90 PS)
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Citroen C3 1.4 HDi (2002 shape) with an occasional 'missfire', the miss fire happens only after a few miles and is fine for the rest of the day.
Very strange.

Lexia shows up P0219 'Intermittent fault, Engine speed signal: Excess engine speed'

and P0339 'Intermittent fault, Engine speed signal: Incorrect signal'

Citroen C3 1.4HDi P0219 delphi crank fault
Citroen C3 1.4HDi P0219 delphi crank fault
P0339 citroen C3 HDi crank sensor engine speed fault
P0339 citroen C3 HDi crank sensor engine speed fault

LEXIA (you can find them on eBay) is the citroen tool for engine diagnostics for the Citroen C3 and its the only tool that works for early diesel C3s, but useful for all the Citroen C3s

The engine speed is taken from the crank sensor and fed to the engine ECU via the wiring loom in the engine bay.

The crank sensor

Checks were made on the wiring and plugs to the engine ECU as they are quite easy to get to being next to the battery and everything looked ok. Next stop the crank sensor. Haynes says is quite simple to remove the crank sensor after removing the inner wing, but although the crank sensor mounting bolt is more easily accessible by removing the inner wing, the sensor is fixed firmly behind the crank pulley. It looks like you have to remove the crank pulley to get the crank sensor out. A quick spray of contact cleaner in the electrical connector and the crank sensor socket is all that could be done without stripping things down.

Citroen C3 1.4 HDi crank sensor location
Citroen C3 1.4 HDi crank sensor location

The Crank Sensor electrical connector can be accessed without removing inner wheel arch as can be seen in the photo.

The sensor electrical connection is quite exposed and low down on the engine, picking up dirt and water on the journey.

citroen C3 crank sensor electrical connector
citroen C3 crank sensor electrical connector

Subsequent driving shows the fault has cleared, due to the cleaning of the crank sensor connector. :P

To clean the connector, remove the electrical plug from the sensor, spray some Electrical Contact Cleaner onto the plug and socket contacts, refit the plug to the crank sensor and start the engine to test.
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