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Technical Questions
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Brake Fluid explained  Brake fluid... Bit of a mystery topic!To help dispel some myths and for some good solid general info[more ...] By oilman  On Mon Dec 13 2010, 01:32pm
3 23383 kipper
Thu Mar 22 2012, 12:47pm
Sticky Thread
[Sticky]
MOT Test 2012 changes  There has been lots of discussion as to what will and won't be required from 2012 so if you want the[more ...] By Dave_Retired.  On Wed Oct 26 2011, 08:54am
1 22698 PentlandC4
Tue Jan 03 2012, 09:02pm
Sticky Thread
[Sticky]
Aftermarket HID headlamps. What you need to know. July 07  HID = High Intensity Discharge, commonly known as Xenon, headlights.From the Dept for Transport, Dec[more ...] By BigJohnD  On Wed Jul 25 2007, 03:24pm
3 24566 Dave_Retired.
Thu Feb 03 2011, 07:49am
Sticky Thread
[Sticky]
The Definitive Biodiesel Guide for your C4  According to Citroen Sustainable Development Team as of September 2008, this is the guidance for run[more ...] By firebee  On Fri Sep 05 2008, 12:12pm
13 28324 routemaster1
Sat Feb 20 2010, 05:31pm
Closed Sticky Thread
[Sticky]
EGS Gearbox Classification  I have spoken to DVLA (both Swansea and London) and neither organisation is sure how to classify the[more ...] By blueclouduk  On Wed May 07 2008, 10:05am
3 24445 The Lyonator
Mon Dec 08 2008, 09:27pm
 Forum Threads
HEAD UNIT WIRING PLUG  Hi I am new to the forum and from South Africa. I have recently purchased a 2010 2.0 C4 VTS COUPE an[more ...] By Weltevreder  On Wed Jan 21 2026, 09:50am
8 705 Nickbrown123
Fri Apr 10 2026, 12:26am
C4 THP - Error code FC83 and F4BA  HiI hooked a Lexia to my C4 ( make year 2009 ) THP and read the error logFC83 Transponder aerial fau[more ...] By CitroenZX  On Thu Mar 17 2016, 10:35am
1 5738 Farmerguy
Sat Nov 15 2025, 01:42pm
Fuel Filler Cap Error  I am getting a code on my 2006 1.6 HDI idicating there is an issue with the fuel cap sensor.Is this [more ...] By J.Alford  On Sat Nov 01 2025, 11:09am
None 958 -
Re: Esp/asr fault on project c4 picasso mk1 2013  If I remove esp/abs ecu from hydraulic block on c4 picasso mk1 2013 1.6hdi will it leek out hydrauli[more ...] By vincentfishing  On Fri Jul 18 2025, 06:10pm
1 1713 vincentfishing
Sat Sep 27 2025, 07:03pm
Help on Shunt Fuse usage (Need to park the car for long time)  Good morning,Would you please help me on how I can use the "Shunt fuse" function to avoid draining m[more ...] By KarimGazzeh  On Wed Jan 06 2016, 07:19am
7 26515 Deckard
Thu Aug 28 2025, 07:26am
2005 C4 VTS Fan Blower motor not working  Hello My Fan blower motor is not working.I have replaced the blower motor, Control panel from dash, [more ...] By SimonSterjov  On Thu Jun 05 2025, 09:06am
None 1755 -
2023 C4 not playing USB Memory Card  Hi,Thanks for having me. I couldn't find the post i was looking for that related to my question, so [more ...] By Al2222  On Fri Jun 30 2023, 02:19pm
5 9790 Nickbrown123
Sun May 11 2025, 09:29am
C4 VTS electric windows not working when car is not running  Hi,I have a problem with the windows not opening up and down when i have the ignition on. I have to [more ...] By SimonSterjov  On Sun Jan 19 2025, 08:51am
3 2567 Nickbrown123
Sun May 11 2025, 09:26am
Electrical Experts, I need your help - A relay to delay power for 5-10s?  2005 Citroen C4 - I have had an issue with the AC blower fan not working, though the actual AC was o[more ...] By Valleriani  On Mon Oct 22 2018, 12:07pm
5 13433 Nickbrown123
Sun May 11 2025, 09:25am
C4 20111.6 e_HDI electronic gearbox problem  Suddenly displayed various warning lights ABS, EPS, Parking brake.Also displays warning message "Gea[more ...] By Planty2012  On Mon May 27 2024, 07:11am
3 3591 gango67
Thu Oct 31 2024, 07:10pm
Another blower not working post!  Hi everyone. I'm not a C4 owner, but have a friend who is, and he has asked me to try and find out w[more ...] By mattc4  On Sat Oct 28 2023, 04:37pm
7 5587 vexorg
Mon Oct 21 2024, 12:42pm
No New Posts on Popular Thread
Vacuum valve turbo compressor  Hi all!Today the turbo stopped working of my Citroen C4 coupe 1.6HDi (2005).It seems the vacuum valv[more ...] By eldee99  On Mon Apr 16 2012, 08:18am
12 16400 zcream
Thu Sep 19 2024, 11:26am
No New Posts on Popular Thread
Remote Locking Not Working After Key Fob Battery Change  I have just replaced the battery in my key fob (C4 Grand Picasso) as the old one was getting very 'h[more ...] By Pieboy32  On Sat Aug 27 2011, 02:05pm
14 48885 Nickbrown123
Sat Aug 03 2024, 02:45am
Preheat relay fuse location help!!  Can anyone tell me where the fuse for the glowplug/preheat relay is located.I do not have +12v in th[more ...] By Frankmich  On Mon Apr 25 2016, 07:05pm
5 28266 Nickbrown123
Sat Aug 03 2024, 02:43am
Timing Belt MK2 C4  Hello,I downloaded the C4 timing belt tutorial from this site, but it must be for the earlier C4 bec[more ...] By madjack  On Mon May 27 2024, 04:06pm
1 3316 vexorg
Wed May 29 2024, 08:19am
C4 Sense - HUD Question  Hi, thanks for the add to this forum and hoping someone can help! I've recently bought a 2021 Citroe[more ...] By SamG  On Fri Apr 26 2024, 10:00pm
None 3305 -
Citroen C4 2009 Petrol 1.6, help with upstream and downstream Oxygen sensor readings.  Hi, I have a Citroen C4 2009 1.6 petrol, when I use Diagbox to monitor the oxygen sensors, the downs[more ...] By AndyR  On Wed Feb 21 2024, 10:13pm
None 3910 -
brake pedal drops to floor  Hi Allbeen a fan for while, so much info on the site, but im struggling with an issue and Im hoping [more ...] By KevinSteyn  On Sat Oct 21 2023, 07:48am
2 4890 KevinSteyn
Sun Oct 22 2023, 11:01am
Mig Welding Advice on C4  Hi My 2008 C4 Picasso HDI 1.6 Has started to show blistering on external lower sills. I used to weld[more ...] By tvman  On Fri Oct 13 2023, 04:13pm
None 4526 -
Automation Gearbox Problem  Hello, I’m having a problem with AL4 trans of my 2006 C4. After I start my car and drive, the gear i[more ...] By yvzkdr  On Sat Oct 07 2023, 07:18pm
None 4513 -
Intermittent underboost  Hi guys,My coupe 1.6 hdi 110 has an intermittent underboost. Whenever it happens I've learned that i[more ...] By Geoagros  On Sat Sep 16 2023, 04:14am
None 4709 -
Electric problem  I have a 2010 C4 with an electric issue. The fuse for the cooling fan (control) burns out after abou[more ...] By shauntbh1  On Tue Sep 12 2023, 11:25pm
None 4802 -
2016 C4P 1.6 Blue HDi Ad Blue Fault code P2047  Hi, can anyone help ?Have replaced the Ad Blue Injector (twice) and had faults Cleared. But after a [more ...] By Leccietech  On Mon Sep 11 2023, 09:22pm
None 4956 -
C4 2006 daytime lights  Hello everyone,I’m planning to retrofit a daytime led inside the original headlight but I need help [more ...] By yvzkdr  On Wed Sep 06 2023, 07:43am
None 4810 -
C4 vents  Hello, guys,I have a Citroen C4 1.6 HDi 84kw from 2012.I was in an authorized service center a week [more ...] By Onopko  On Wed Aug 16 2023, 04:41pm
2 5182 Farmerguy
Thu Aug 17 2023, 09:24pm
1.6 Hdi 110hp Cam Chain Replacement  Hello i have a 2004 1.6Hdi 110hp with just about 98,000 miles and it makes a loud rattle noise when[more ...] By Dave 110hdi  On Wed Jul 19 2023, 08:36am
2 5341 BigJohnD
Tue Aug 01 2023, 10:55am
C4 Picasso 1.6 HDi Semi Auto 2009 - Engine Bay Hidden Maxi Fuses  HiI had a C4 Picasso 1.6 HDi Semi Auto for a couple of years now and have been putting up with a bat[more ...] By popenator  On Tue Jan 17 2023, 04:37pm
None 6377 -
2016 C4 TPMS Warning Light Reset?  Had the TMPS warning light flash up yesterday to say the LHF tyre had low pressure.........it wasn't[more ...] By DonXabi  On Wed Nov 30 2022, 12:07pm
7 8374 DeuxChevaux
Thu Dec 01 2022, 04:41pm
Timing belt 2.0l petrol vtr+ 2005  Hiya do I need to get the water pump sorted the same time as the timing belt or is it separate on t[more ...] By MarkTee  On Tue Nov 15 2022, 07:26pm
3 7066 MarkTee
Wed Nov 16 2022, 06:08pm
Instrument Panel keeps switching between KM and Miles  Hi folks,I have recently replaced the RD45 radio with one of the Chinese 9" Android head units. It c[more ...] By scotcruz  On Mon Nov 14 2022, 08:42pm
None 6829 -
Lights, Windscreen Wipers and Heating Start Up After Locking Doors  Hello, Thanks for reading my post.My 2010 Citroen C4 has a weird problem, help!!When the car is turn[more ...] By RichE76  On Mon Nov 07 2022, 08:38pm
1 7011 Ap0qalypto
Tue Nov 08 2022, 07:03am
Engine cranks but doesn't start  Hello guys, I have a problem with my c4 2.0vts. It has been 2 years now that I wasn't using it. So a[more ...] By C4AKIAS  On Sun Oct 30 2022, 11:54am
None 6864 -
C4 2.0 petrol (138hp) upgrades  So i was thinking about getting some performance upgrades for my petrol 2.0 C4 (EW10J4).It seems har[more ...] By wsx  On Sat Dec 19 2020, 07:36pm
3 14610 MarkTee
Thu Aug 25 2022, 07:24pm
Mk1 2.0l petrol engine upgrade  Hiya has anyone on here tried to up the horse power on the mk1 vtr+ 2.0 litre petrol engine, cheers [more ...] By MarkTee  On Thu Aug 25 2022, 07:06pm
None 7565 -
Heavy smoke coming from oil cap - 1.6 THP. Is this a PCV issue?  I have some heavy smoke coming from C4GP 1.6 THP. I also noticed the air house going into turbo was [more ...] By EyeAmNo1  On Wed Aug 10 2022, 10:58am
None 8167 -
Global closure of windows  HiI have a 2014 Mk2 C4 Picasso,The global lock works OK, so when I press and hold the lock button on[more ...] By las16  On Sun Jul 31 2022, 12:53pm
4 8581 routemaster1
Mon Aug 01 2022, 11:13am
Name of front brace bar  Hi allHoping someone can help me find the name of a part.Trying to diagnose a knocking noice on the [more ...] By Coll659  On Sat Jun 18 2022, 10:15am
2 9082 routemaster1
Sat Jun 18 2022, 05:30pm
clutch master cylinder replacement  can any one give me information on how to change/access the clutch master cylinder on my c4 2011 die[more ...] By steve1958  On Sat Nov 27 2021, 11:45am
1 11849 Wullcaldwell
Sun Jun 05 2022, 04:16pm
Technical Teaser regarding regeneration.  Firstly replaced within the last month.1. New Turbo and Associated Oil Pipes, All filters and Fresh [more ...] By Crouchy  On Fri Mar 28 2014, 06:46pm
7 14680 Farmerguy
Mon May 09 2022, 07:26pm
2021 C4 SS 130. software download problems  Hey all. Im trying to download ANOTHER update for my Touchscreen, its the 2nd time ive done this in [more ...] By TCSpacemanUK  On Tue May 03 2022, 11:12pm
None 9268 -
Sticky rear calipers  Hi, I've got a 2005 hdi. It's just failed on (amongst other things) the nearside Rear brake binding.[more ...] By ALEXPAR  On Sat Apr 30 2022, 06:26pm
4 10323 vexorg
Sun May 01 2022, 10:39am
Direction Indicator Issue  Hi All.Need some help please.I have a 2013 C4 Picasso Exclusive Airdream and I have a Service light [more ...] By tonyvan  On Sun Apr 15 2018, 10:11pm
9 17534 Farmerguy
Sat Apr 30 2022, 04:52am
Leaking 1.6 Hdi injector studs solutions  Hi, My 100,000 miles -05 C4 is leaking engine oil at the injector studs/bolts (not from the injector[more ...] By Lecat  On Sat Apr 02 2022, 03:59pm
None 9971 -
C4 1.6 VTR timing  Hi to all Timing belt snapped on daughter's C4Got new belt, pump etc. but if belt snapped how do I p[more ...] By kirkbykidda  On Sun Mar 13 2022, 11:53am
2 10479 vexorg
Mon Mar 14 2022, 10:10am
Installed new stereo, car won't start (amongst other things)  Hello there, first post here and it's a strange problem and no doubt. I've searched the fora of cour[more ...] By Sq1rL  On Wed Mar 02 2022, 03:50pm
3 10659 Sq1rL
Thu Mar 03 2022, 10:23am
2011 C4 Picasso - coolant bleed screws  Hi everyone, I've got a 2011 C4 Picasso 1.6 petrol and I would like to ask if anyone might know wher[more ...] By stevied  On Thu Feb 17 2022, 02:22pm
None 10269 -
Driver/front passenger seat removal - C4 Spacetourer  Hi guys, can anyone advise me on how to remove the front seats - both driver and passenger? I bought[more ...] By noodle1138  On Sun Feb 13 2022, 10:09am
None 10938 -
Citroen C4 ESP error and engine stopping  2006 model 1.6HDi Citroen C4 gives an ESP warning while driving on the road and stops and does not w[more ...] By maydemir77  On Thu Feb 10 2022, 06:16pm
8 12803 maydemir77
Fri Feb 11 2022, 02:13pm
C4 Loeb fault code  HelloCan anyone tell me what to look for with this fault code please;«State: IntermittentRear RH Exh[more ...] By sx-pack  On Thu Feb 03 2022, 12:56am
1 10888 BigJohnD
Fri Feb 04 2022, 04:26pm
2010 Citroen c4 auto 1.6 Vti  Hello just bought this car but have discovered that there is a slight shake between 1st and 2nd gear[more ...] By Lukejoso  On Thu Jan 27 2022, 05:26am
None 10583 -
C4 grand picasso 2014 1.6thp ep6cdt BSM under bonnet fuse box  Hi All,I was wondering if anyone could confirm the bsm that goes into 2014 c4 grand picasso I believ[more ...] By Eagersap8  On Sat Jan 15 2022, 05:09pm
1 11108 Ap0qalypto
Sat Jan 15 2022, 05:32pm
C4 Hatch 2L 2005 - Help with wiring of Thermostat Heater Wiring Plug  Hi all, I have been scratching my head with this issue for a while but now nearing the mark. Backgro[more ...] By Spada  On Wed Jan 05 2022, 10:57am
None 10846 -
C4 I gen front pillow removal  Dear allI left car with windows down and a cat jumped in to urinate on the passenger seat.I need hel[more ...] By Mmd78  On Sun Dec 05 2021, 10:29am
1 11519 Mmd78
Wed Dec 15 2021, 10:04am
No New Posts on Popular Thread
C4 diesel injector selection  hi all, i am looking for a new fuel injector as my mechanic test one as faulty. however searching bo[more ...] By Dan_68c  On Mon Sep 03 2012, 10:59am
Goto page: [ 1 2 ]
18 40285 GazSto
Tue Nov 16 2021, 09:28pm
Citroen C4 – STOP, service, unstoppable wipers and other electrical problems.  Hi.My Citroen C4 1.6 HDI 2007 aut. recently started having a total electrical meltdown. Mechanically[more ...] By Samks  On Wed Nov 10 2021, 02:48pm
4 12874 Samks
Tue Nov 16 2021, 08:53pm
C4 2010 VTR+ Automatic Drive mode issue  Hi, I have just bought the car from a private seller,C4 2010 1.6 vtr+ hdi Diesel Turbo. the car seem[more ...] By aalluu  On Sun Oct 17 2021, 06:45am
1 12157 routemaster1
Sun Oct 17 2021, 06:21pm
C4 B7 2013 Clutch Bite Point  My cars clutch seems to only do anything at the very last 2 inch or so of pedal travel.Had Peugeots [more ...] By dcgpx  On Sat Oct 02 2021, 05:51pm
None 11956 -
Overfilled tank - won't start  I foolishly topped up my already nearly full tank with a can of petrol. I have to drive 200 miles (y[more ...] By toomuchpetrol  On Sun Sep 26 2021, 10:26am
1 12417 vexorg
Sun Sep 26 2021, 10:39am
Does my car have a dual mass flywheel?  Hi, hope someone can help. I have a 2012 C4 1.6 hdi with the 9HP engine code. Can anyone tell me if [more ...] By osmo42  On Tue Sep 07 2021, 11:43am
1 12628 tomandjo2
Tue Sep 07 2021, 08:47pm
Egs pump/actuator  *removed and posted in correct forum By Paulm40  On Mon Aug 30 2021, 07:18am
None 12547 -
Technical service bulletin VF7SB5FS0DW585199 - Can anyone access it?  Sorry this is not about a C4 but is about my wifes DS3 Cabrio. Citreon have posted a TSB about how t[more ...] By DeuxChevaux  On Sun Aug 15 2021, 01:30pm
3 13166 DeuxChevaux
Tue Aug 17 2021, 09:57pm
No New Posts on Popular Thread
06 Citroen C4 Oil in Spark Plugs  Hi All, Has anyone ever encountered where oil leaks into the spark plugs?As in ALOT of oil, the firs[more ...] By Kanaalaap  On Wed Aug 04 2021, 08:50am
11 14166 Kanaalaap
Thu Aug 05 2021, 11:02am
C4 2009 1.6hdi wheel bearing issue or not  Hi allI currently have this problem that i just can't pinpointOn bends at speeds turning left I get [more ...] By ddebling  On Wed Aug 04 2021, 09:25am
1 13019 tomandjo2
Wed Aug 04 2021, 11:48am
DPF related fault codes and searching for correct part  Hi,The engine management light has recently come on on my C4 (2005 2.0 HDI hatchback, currently at 1[more ...] By Rob_E  On Tue Aug 03 2021, 09:39am
None 12746 -
C4 1.6 SX 7k rpm before changing to second gear  Hello, new here but looking for advice, just purchased a used C4 1.6 SX and it's taking getting to 30mph and 7k rpm before the auto changes to second gear. the garage has told me it's OK and normal for the car. I'm dubious about that. but it is my first car and only car I've driven since lessons. thank you for any advice given. By marc85y  On Fri Jul 23 2021, 08:46pm
7 13686 marc85y
Sat Jul 24 2021, 01:23pm
Lower ball joint  I think my lower ball joint has gone. There is fluid around the rubber and there is a knocking sound[more ...] By zx9fella  On Fri Feb 19 2010, 01:42pm
9 17706 vexorg
Fri Jul 23 2021, 08:17am
2008 C4 Rear brake rotor and bearing  Firstly, thank you for the wonderful resources on this forum. I have a 2008 C4 Hatch which I am look[more ...] By DaytonaV  On Wed Jul 21 2021, 09:25pm
None 12532 -
Battery life and recommended replacements  Good afternoonMy Citroen Grand C4 Picasso (1.6 petrol automatic) is coming up on 4 years old. This i[more ...] By DanM  On Thu Jul 01 2021, 03:20pm
3 14890 DeuxChevaux
Fri Jul 02 2021, 07:41am
Need help with alarm gone mad  Regarding a Citroen C4 Coupe.So recently when the cold came by, the alarm went crazy. Basically when[more ...] By natiolo  On Thu Dec 10 2020, 11:01pm
4 14547 bobbyla
Tue Jun 29 2021, 01:18pm
2005 Coupé 136hp Clutch change  Afternoon, my clutch has been juddering for a while and now it's started pulsing through the pedal. [more ...] By moizeau  On Wed Jun 23 2021, 11:40am
None 12801 -
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