C5 anti pollution

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

Moderator: RichardW

User avatar
GiveMeABreak
Forum Admin Team
Posts: 36996
Joined: 15 Sep 2015, 19:38
Location: West Wales
My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow
x 5645

Re: C5 anti pollution

Post by GiveMeABreak »

Ignore me Graham of I was getting you confused with a similar request from another member!

I can see your picture above - give me a bit of time.
Please Don't PM Me For Technical Help

Marc
Grahambeveridge225
Posts: 56
Joined: 06 Aug 2017, 14:48
Location: Edinburgh
My Cars: Citroen c5

Re: C5 anti pollution

Post by Grahambeveridge225 »

Not a problem. No rush and thanks again
User avatar
GiveMeABreak
Forum Admin Team
Posts: 36996
Joined: 15 Sep 2015, 19:38
Location: West Wales
My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow
x 5645

Re: C5 anti pollution

Post by GiveMeABreak »

Right this is the P2084 which means that the temperature recorded 'Downstream' of the catalytic converter is not right and the P2083 is similar but refers to the 'Upstream' temperature.
So it would be very odd for both of these sensors to be faulty at the same time - so I suspect it is symptomatic of the emissions system - these sensors are really to protect the Cat from too much heat. As you can see, the back up mode in this state will prevent a forced regeneration, as this would add to the heat generated. It is supposed to be an intermittent fault, but if it is regularly coming on, it will need further diagnostics to determine the issue.

Click to Zoom Table
X7 P2084.PNG
What sort of mileage has she done?

Do you do a lot of short journeys?

When was the last time you took it for a good spin? You could try going for a 30 minute spin, keeping it in 4th so the revs remain highish and see if that will clear it out.

Edit: Corrected P2086 - should of been 2083
Please Don't PM Me For Technical Help

Marc
Grahambeveridge225
Posts: 56
Joined: 06 Aug 2017, 14:48
Location: Edinburgh
My Cars: Citroen c5

Re: C5 anti pollution

Post by Grahambeveridge225 »

Thanks marc

Mileage is 106000
Mainly motorway journeys .
Thanks for your help in this. I'll let you know the outcome
Grahambeveridge225
Posts: 56
Joined: 06 Aug 2017, 14:48
Location: Edinburgh
My Cars: Citroen c5

Re: C5 anti pollution

Post by Grahambeveridge225 »

Faults cleared. Been told my battery is still original.now 9 years old.could be causing the faults to show
RichardW
Forum Treasurer
Posts: 10812
Joined: 07 Aug 2002, 17:12
Location: United Kingdom
My Cars: MK2 '17 C4GP 1.6 BlueHDi 120
'13 3008 1.6 HDi GripControl
x 983

Re: C5 anti pollution

Post by RichardW »

It's the other way round, Marc - the sensor is to ensure the exhaust temp is hot enough to start the regen - hence regen being inhibited if it's faulty. This is the same error I picked up on John's a few weeks ago, his went away though! New sensor was £125 iirc....
Richard W
User avatar
GiveMeABreak
Forum Admin Team
Posts: 36996
Joined: 15 Sep 2015, 19:38
Location: West Wales
My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow
x 5645

Re: C5 anti pollution

Post by GiveMeABreak »

I mistyped the error code Richard :roll: (now corrected) - the second one should of been P2083 (not P2086) which is the upstream one I believe and should indicate when there is excessive heat. Temperature values intermittent from what I can see. You’d think with all the sensors now they’d be able to be a little more specific! :)
Please Don't PM Me For Technical Help

Marc
MikeT
Posts: 4809
Joined: 11 Jun 2007, 16:17
Location: Christchurch, Dorset. UK
My Cars: 2005 C5restyle 1.6HDI 16v 110hp VTR Estate
2008 C5 X7 1.6HDI VTR+ Saloon
x 231

Re: C5 anti pollution

Post by MikeT »

Are there two EGT's, I thought they only needed the one?

Yes, a tired battery can be cause all sorts of wierdness and trigger fault codes without there being any other problem.
Add the fact the specified faults (above) "disappears" simply by turning the ignition on, you may find it returning soon anyway.
User avatar
GiveMeABreak
Forum Admin Team
Posts: 36996
Joined: 15 Sep 2015, 19:38
Location: West Wales
My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow
x 5645

Re: C5 anti pollution

Post by GiveMeABreak »

What's an EGT Mike? ^

If you mean EGR - no just the one. The fault in question relates to the gas temperature sensor - not the differential pressure pipes:
X7 Gas Temp Sensor.PNG
(2) is the gas temp sensor, with the differential pressure pipes shown at (6), and the differential pressure sensor at (1).

The fault will prevent a forced regeneration from being undertaken with Diagbox (due to the additional heat generated) - but should still allow a normal regeneration to take place.
Please Don't PM Me For Technical Help

Marc
MikeT
Posts: 4809
Joined: 11 Jun 2007, 16:17
Location: Christchurch, Dorset. UK
My Cars: 2005 C5restyle 1.6HDI 16v 110hp VTR Estate
2008 C5 X7 1.6HDI VTR+ Saloon
x 231

Re: C5 anti pollution

Post by MikeT »

It's what I call the sensor, Marc.

Edit to add, after you edited your post Marc,

Exhaust Gas Temperature. In your data it's referrred to PEF temperature but I still call it EGT as that's what Diagbox calls it.
User avatar
GiveMeABreak
Forum Admin Team
Posts: 36996
Joined: 15 Sep 2015, 19:38
Location: West Wales
My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow
x 5645

Re: C5 anti pollution

Post by GiveMeABreak »

Got you! :-D So as you can now see from the diagram I added, it shows the one sensor for the temperature.
Please Don't PM Me For Technical Help

Marc
MikeT
Posts: 4809
Joined: 11 Jun 2007, 16:17
Location: Christchurch, Dorset. UK
My Cars: 2005 C5restyle 1.6HDI 16v 110hp VTR Estate
2008 C5 X7 1.6HDI VTR+ Saloon
x 231

Re: C5 anti pollution

Post by MikeT »

GiveMeABreak wrote: 04 May 2018, 17:33 Got you! :-D So as you can now see from the diagram I added, it shows the one sensor for the temperature.


That's what I was getting at. There is no up AND downstream sensor, just the one.
Grahambeveridge225
Posts: 56
Joined: 06 Aug 2017, 14:48
Location: Edinburgh
My Cars: Citroen c5

Re: C5 anti pollution

Post by Grahambeveridge225 »

Thanks for all your help guys. Really appreciate the responses. Can't thank you enough
Grahambeveridge225
Posts: 56
Joined: 06 Aug 2017, 14:48
Location: Edinburgh
My Cars: Citroen c5

Re: C5 anti pollution

Post by Grahambeveridge225 »

Guys good evening .
Right.new battery all went well. Now have light on again. Code p2033 and p2084 bank 1 sensor 2. Is this something I could do myself?
RichardW
Forum Treasurer
Posts: 10812
Joined: 07 Aug 2002, 17:12
Location: United Kingdom
My Cars: MK2 '17 C4GP 1.6 BlueHDi 120
'13 3008 1.6 HDi GripControl
x 983

Re: C5 anti pollution

Post by RichardW »

Both related to the temp sensor, looks like it will need to changed. Should be easy enough on a set of ramps.
Richard W
Post Reply