I’m dealing with a persistent fault on my 2016 Citroën DS4 2.0 BlueHDi and would really appreciate some insight.
Please watch the YouTube video with the noise that seems to come from fuel rail pressure / injectors
Faults shown by diagnostic (Autel):
P2687: Fuel heater control – open circuit
P164A: Crankcase fumes heater – short circuit to ground
P1647: Crankcase fumes heater control – open circuit
P0215: Main relay control – relay stuck
Work already done / tests performed:
Replaced the fuel heater relay
Replaced the fuel rail sensor
Replaced fuel filter housing with a new one (fault P2687 remains)
Replaced the engine fuse box (BSM) with same model (BSM-Z06-01 980296480) – no change
Tested Delphi injectors (PN: 28388960) with a Fluke multimeter – all show approx. 0.3 ohms, consistent and beeping (continuity OK)
Resistance test done with ignition OFF and engine cold, 12V disconnected
Tested known good injector from a DS3 – same readings (0.3 ohms)
Checked heater connector – around 15V with ignition ON, then drops
Graphs from the diagnostic tool show unstable rail pressure at idle but become stable around 2000 RPM
Also experiencing crankcase heater faults, though component seems integrated into the valve cover – considering replacing full valve cover with PCV system
