Anti-Pollution Fault Indication - Error?

[Sixchannel]

I stupidly tried to start my 2010 C5 Tourer whilst in gear (!!) but very quickly dumped the clutch and turned ignition off. On second attempt I got, and still get,a dashboard message that anti-pollution is faulty and the warning light is on. The engine now seems to idle faster. Is this a false indication that needs a reset at my citroen garage OR have I just damaged something.

All help appreciated

[paul.h]

Only way to find out what the car thinks is wrong is to plug a code reader in but you could have look round to see if there is anything obvious such as a connector loose or air duct loose. It is cheaper to buy a code reader than pay a garage to read the codes, as an example of one that also gives some live data https://www.gendan.co.uk/product_FXNT200.html

[Sixchannel]

Thanks Paul. Sorry for delay - holidays got in the way.

Spoke to my independent Citroen garage (who've looked after my Citroens for 20 yrs) and he said to bring it in and they'd put their Reader on as a Freebie.

So far so good. On the way there the message Disappeared (!!) and no existing fault showed on the Reader.

Odd.

[paul.h]

Did you get the old fault code from when the light came on, just in case it comes back again it will give you an idea what might be wrong ?

[Sixchannel]

I never asked. Sorry. Its Service time in January - will the onboard system have retained it?

[paul.h]

The old fault codes remain until they are deleted using a code reader so the garage might have deleted it. You can also get pending codes which also need a code reader to see but if there are any it would suggest the problem is still there but not bad enough for the light to come on or for a warning message to be given.