hi drove my van from Poland to u.k no bother ,on the subsequent drive back it went into limp mode i.e would not rev beyond a certain point, this continued till we go home when the next day i started it up and all was good again ? no problems since i think i need a code reader,but which reader? would anyone recommend any!! i am at a loss as to why this occurred and can only put it down to the rain we drove through on the way home any help would be gratefully accepted thanks...other than this the van has been serviced and is done 80k all in good order

steve, March 2012

Check the air filter is not wet I had a C5 with the wheel arch liner broken / split and the rain /spray from the wheel was being sucked into the air intake pipe which is behind the wheel arch liner

arizona kid, March 2012

Limp mode is sometimes down to turbo, Check your air filter, had same myself.
ELM327 is the reader you would need, use with a laptop, you will be able to get a reader off ebay cheap

SD, March 2012