JC652. Sat Jan 23 2010, 12:45pm. Hi all, Seems the weather has added a wiered fault to my VTS Hdi, earlier the fuel neck sensor was reporting faulty, a new neck sensor fixed this. Faults reset and off we went, all was well until the de-polloution fault re-appeared, drat! Looks like a harness fault. Got home, plugged into my Lexia, fully 4. Posted May 28, 2015. Dears, In my Citroen C4, 1.4 petrol (hatchback 2004), just a few seconds after I start the car the message "depollution system faulty" appears on the screen and the engine management light stays on. For most part the car behaves normally, expect that now in low revs (for example behind a traffic light) it jitters and Thanks for that. Yes had already read up on that, however it is the cool temperature that has me more curious. A sensor fault is fine, but the thermostat is a traditional wax pellet type (is it not?) therefore the sensor although will be altering the petrol/air mixture and choke control it won't contribute to the cooling/circulation of the coolant. 03 2.0 Engine Anti Pollution System Defective - raf_man I dont believe the dual mass fly wheel was replaced, ive seen the recipt for the clutch was about £110 plus the filters etc came to £160 all in, and then labour on top of that, so unless the duall mass flywheel came with the cluctch Kit I dont think it has been replaced Overnight tried reset system. disconnected battery for 1 hour, reconnected, no warning light. started engine, after 30 seconds warning light re-appeared with message "antipollution fault". Nothing else seems affected, still have power etc. Question will continuing to run the car have a detrimental affect, I have upward of 1000 miles to travel To remove the switch, grip and rotate the switch 90 degrees anti clockwise, the disconnect the connector. When replacing the old switch for the new one, you need to set the plunger new switch to the same length as the old one. In today's video tutorial we will see how to remove and replace the engine air filter on Citroen C4 first series, with 1.6 HDI engine. First we open the engine hood of our car and start by removing the brake fluid reservoir; we then disassemble the plastic upper part, in order to access the air filter box, as shown in the video. Re: Citroen fault codes ako se radi o c4 2.0 hdi tada taj auto možda ni nema P1429 grešku koju prikazuje. tvojim prijašnjim postovima vidim kako si kupio auto sa greškom aditiva, i bilo je prilikom kupnje neke igre oko aditiva. vjerojatno vučeš greške neko vrijeme i sve skupa je poblesavilo. 2007 CITROEN C4. 75,000 MILES. I drive a Citreon C4 2007 HDCI and I got a message on the dash saying that the anti pollution fault, a mechanic changed this but now when I am driving the car it not revving as when I floor it in every gear it doesn't get above 3 thousand revs and there is a severe lack of power. Common thread is that some Citroen garages, not forgetting experienced independents can diagnose and fix well. Some dealers who haven't invested in technician training or kit can't. The anti pollution faults will have fault codes logged. You need to get the codes and investigate. If your car is EOBD complaint then a cheap reader may be the GH98.