Engine Management

[KeithE]

I've had my 2008 C5 X7 auto for about 9 months now and am reasonably happy with it

I don't drive it hard and an getting high 30s to the gallon in mixed town and my commute to work.

 

A few times (actually 3) I've tried to drive it a bit hard, like I'd stolen it and every time it chimes at me, the engine management light comes on and stays on, I get an engine management warning and lose the cruise control.

The last time it happened I attempted to accelerate from 70mph on the motorway, the gearbox changed down two gears, which I wasn't expecting, the warnings came up the transmission changed back up, all almost instantly and the car still performed what seemed like normally.

If I switch it off and leave it for 45 minutes it fixes itself.

 

I know it probably needs diagnostics but I am hoping someone nway have encountered this before, so that I have an idea where a garage should be looking

Thanks in advance for your help.

[paul.h]

Is the fuel filter due for replacement ?

[KeithE]

I don't think so.

The car was serviced not long before I bought it and I've only done about 4000 miles since

[paul.h]

The fuel filter is not replaced every service so you would need to check your records/receipts to see if it was done. Citroen often call the fuel filter a filter pad on the receipts.

 

I think though you will need to use a code reader to see what is wrong. If you buy get one that also does some live data since it will be more useful, as an example http://www.gendan.co.uk/product_FXNT200.html The diagnostic connector is in the front seat centre arm rest cupboard, possibly under a mat.