Citroen C5 HPi Faulty anti pollution warning light

This is the Forum for all your Citroen Technical Questions, Problems or Advice.

Moderator: RichardW

Fabio
Posts: 18
Joined: 02 Sep 2018, 23:31

Citroen C5 HPi Faulty anti pollution warning light

Post by Fabio »

It is a Petrol HPi

Fabio
Posts: 18
Joined: 02 Sep 2018, 23:31

Re: Faulty anti pollution warning light

Post by Fabio »

Do you know what is the reason of this warning for petrol engines?

Thank you

User avatar
GiveMeABreak
Forum Admin Team
Posts: 20347
Joined: 15 Sep 2015, 19:38
x 2004

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by GiveMeABreak »

I've split this into a new topic Fabio so as not to confuse the issue. If you have your VIN code, post it or PM it and I will have a look based on your car specs.

User avatar
xantia_v6
Forum Admin Team
Posts: 7374
Joined: 09 Nov 2005, 23:03
x 406

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by xantia_v6 »

When does the light come on?

If it comes on under hard acceleration, then it seems to be a symptom of a failing high pressure fuel pump, which is common on these engines, and often not worth repairing.

Fabio
Posts: 18
Joined: 02 Sep 2018, 23:31

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by Fabio »

Thanks for split the post
I usually drive in a small city. The warning light comes after I drive in low rpm (1500 to 2000)
I drove about 250 miles on motorway and the light never came, actually one day the light was on and after i drive a few miles on the motorway the warning light was gone.

User avatar
GiveMeABreak
Forum Admin Team
Posts: 20347
Joined: 15 Sep 2015, 19:38
x 2004

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by GiveMeABreak »

A diagnostic (preferably with a Lexia) is essential for proper diagnosis. If you have your VIN it will also help identify your car.

wheeler
Posts: 4132
Joined: 21 Sep 2002, 19:07
x 132

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by wheeler »

Hopefully its not the HP fuel pump.
Sadly the HPi engine was a bit of a failure, they stopped using it before the Mk1 production even came to an end, This meant lots of parts were also no longer available very early on.
The HP fuel pump which is one of the most common failing parts on this engine is also no longer available from Citroen. Not sure if anyone repairs them but to buy one new would most likely write the car off anyway.

Fabio
Posts: 18
Joined: 02 Sep 2018, 23:31

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by Fabio »

If the car's problem is the High Pressure Fuel Pump for how long is it safe to drive the car without replace for a new one?

Thank you

User avatar
GiveMeABreak
Forum Admin Team
Posts: 20347
Joined: 15 Sep 2015, 19:38
x 2004

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by GiveMeABreak »

If it is the fuel pump, then I think we're trying to say that you may not be able to replace it - as the run of these cars with the HPi engine was only from 2001 to 2003 due to poor sales. So the availability of HPi pumps is extremely rare on the second hand market as they have not been available from Citroen for a long time.

If it's failing then it won't get any better, just worse - but you need the confirmation first.

If you pop up your VIN I'll check the part number, but I suspect (without checking) that it will be a 1920 AR pump. Haven't managed to locate one yet.

User avatar
xantia_v6
Forum Admin Team
Posts: 7374
Joined: 09 Nov 2005, 23:03
x 406

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by xantia_v6 »

If you read this topic: viewtopic.php?f=3&t=54241 you might find some useful information, and a possible source of a refurbished pump.

Finding the link to the refurb service from our forum link is a bit convoluted, here is a direct link: https://www.vectra-c.com/forum/showthre ... ng-Service

Online
User avatar
Paul-R
Donor 2020
Posts: 4036
Joined: 07 May 2009, 16:24
x 399

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by Paul-R »

There were some posts a little while ago about reconditioning the HPi pump. IIRC it's the same pump as fitted to some Vauxhalls. I think...

EDIT

Beaten to the post!

Fabio
Posts: 18
Joined: 02 Sep 2018, 23:31

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by Fabio »

I looked everywhere on internet for the high pressure fuel pump and I couldn't fine one. If the anti pollution fault light is related to high pressure fuel pump it is going to be hard to fix it.
It is a shame that a nice car like this has lack of car parts.
Anyway next week I am taking the car to the mechanic so he can give a look at it.

Thank you all for your help

Fabio
Posts: 18
Joined: 02 Sep 2018, 23:31

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by Fabio »

I noticied something funny. The last there times the anti pollution fault warning showed up exactly in the same place ( it was on the motorway exit downwards on 5th gear but on low speed about 30 miles per hour).

User avatar
GiveMeABreak
Forum Admin Team
Posts: 20347
Joined: 15 Sep 2015, 19:38
x 2004

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by GiveMeABreak »

I would of thought 30 MPH in a Petrol in fifth gear is pushing it - I think that's too high a gear for the speed. On a diesel with the extra torque maybe - but that won't be doing the car any favours if the car is struggling with fuel pressure.

Fabio
Posts: 18
Joined: 02 Sep 2018, 23:31

Re: Citroen C5 HPi Faulty anti pollution warning light

Post by Fabio »

GiveMeABreak wrote:
09 Sep 2018, 14:59
I would of thought 30 MPH in a Petrol in fifth gear is pushing it - I think that's too high a gear for the speed. On a diesel with the extra torque maybe - but that won't be doing the car any favours if the car is struggling with fuel pressure.


Driving at very low RPM is a bad habit I still bring from my previous car. The best maybe is drive between 2000 and 2500 rpm