coppied from cliodci.net...
Phase 3 followed in 2004 starting on a 53 Plate this was just some small revisions to bring it up to date, the front bumper was changed giving it a wide lower grille and the foglights were bulged out at the side (cars not equipped with foglights remained using the older ph2 bumper), the upper grill was changed and the headlights which previously had black backs to them now had silver, the 15" alloy wheels were changed and were now a 15" version of the 172 ones on Dynamique and Extreme models, clear side repeaters were added as was a colourcoded rear spoiler(again on dynamique spec cars).
On the inside the pattern on the seats was changed for a more simple one, and the dials were changed to do away with the fuel and water temperature needles and now featured a larger screen that included a digital version of these guages as well as the millage and trip computer, climate control equipped cars were given a little vent in the back of the glove box so it could be climate controled to keep things cool or warm.
Under the bonnet a new 100bhp DCi engine was available (the 1.2 16v also received a new engine developed with Nissan), rear disks were fitted as standard for the first time on 1.6 16v models and DCi 100 models