Some of the 2.0 diesel engines had a problem with the timing chain stretching and in some cases snapping however if its been looked after it is likely to be fine and with such low mileage as well it should be ok. Just check to make sure its not noisy. A chain clanking and rattling should be obvious.
The computer is easy to reset. I have done it myself when the garage couldn't. You don't need any programming devices. Its just a sequence of pressing the buttons.
Step 1
Insert key into slot
Step 2
Press start/stop button without depressing clutch/brake and wait for the service reminder to dissapear.
Step 3
Immediately after service reminder goes out, press and hold the odometer reset. After 3 secs a warning triangle will appear, keep the odo. button pressed and after another 2-3 secs the Oil can will appear. I f you hold it too long (10 secs in total) you will overshoot the runway and some German writing will appear giving the software level/ can bus etc. of the car. Go back to the beginning and start again.
Step 4
You are now in the service menu, use the toggle switch on indicator stalk to scroll up/down through the various service items.
Step 5
When you have the item you want to reset showing, press the BC button on end of indicator stalk. Reset should now appear in the display. Press in and hold the BC button for 2-3 secs and a clock will start whirling around and hey presto, its done
Step 6
You can now either scroll up/down to select another item (as in step 4) or you can press the start/stop button to exit.
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A word of warning `tho if you don`t want to alter the date of next service, you`ll need to change the date in your car to the date when the last service was done. Otherwise the computer will automatically change the date to 2 yrs from todays date. (hope that makes sense