C5 anti pollution

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Re: C5 anti pollution

Post by GiveMeABreak » 03 May 2018, 15:22

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.
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Re: C5 anti pollution

Post by Grahambeveridge225 » 03 May 2018, 15:24

Not a problem. No rush and thanks again
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Re: C5 anti pollution

Post by GiveMeABreak » 03 May 2018, 16:45

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
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Re: C5 anti pollution

Post by Grahambeveridge225 » 03 May 2018, 18:17

Thanks marc

Mileage is 106000
Mainly motorway journeys .
Thanks for your help in this. I'll let you know the outcome
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Re: C5 anti pollution

Post by Grahambeveridge225 » 04 May 2018, 12:43

Faults cleared. Been told my battery is still original.now 9 years old.could be causing the faults to show
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Re: C5 anti pollution

Post by RichardW » 04 May 2018, 14:52

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....
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Re: C5 anti pollution

Post by GiveMeABreak » 04 May 2018, 15:04

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! :)
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Re: C5 anti pollution

Post by MikeT » 04 May 2018, 17:21

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.
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Re: C5 anti pollution

Post by GiveMeABreak » 04 May 2018, 17:22

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.
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Re: C5 anti pollution

Post by MikeT » 04 May 2018, 17:28

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.
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'05 C5 2.0 HDi Exclusive Obsidian Black
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Re: C5 anti pollution

Post by GiveMeABreak » 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.
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Re: C5 anti pollution

Post by MikeT » 04 May 2018, 17:38

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.
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Re: C5 anti pollution

Post by Grahambeveridge225 » 04 May 2018, 17:43

Thanks for all your help guys. Really appreciate the responses. Can't thank you enough
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Re: C5 anti pollution

Post by Grahambeveridge225 » 19 May 2018, 23:44

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?
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Re: C5 anti pollution

Post by RichardW » 20 May 2018, 09:34

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