limp mode after run and switched off for a while

[blingoblongo]

hello all.

i have a 2004/2005 2.0 hdi diesel that runs great, economical, has 'oomph' when needed.

but....

if i drive somewhere and start the engine again after 20 or 30 mins, i get the engine warning light and limp mode.

it is fine if i car is stopped longer, i guess engine has cooled down?

sometimes, a few start and stop of engine fixes the problem, if not i am forced to do an ecu reset..

(ign on, remove battery positive, ign off, touch positive on battery to earth, reconnect positive, wait a few mins, start engine).

anyone have any ideas?

thanks.

[3rensho]

I'd get a code reader on it to see what error messages are showing, if any.

[blingoblongo]

hi there,

sorry, i meant to add that i did once get a mechanik to read the ecu and it showed clutch switch possible fault and water temp sensor, i changed the water temp sensor and the mechanic suggested it wouldn't hurt to change fuel filter, which i also did.
for a week or so i thought it was fixed, then same issue.
problem is, from my searches on t'internet, even if i do blow 100 quid on a reader, no guarantee it would be of any help as the seimens units are prone to false readings?

i will also add it vary rarely gets used on long runs at speed, something i have since learned is not ideal for diesels.

anyone experienced my actual problem?

ta! sg,

[homeruk]

You need to read the codes,

Your working blind if you don't as it could be any number of things.

You can get a reader off eBay for a tenner which uses an app on your smartphone called torque.