Hi, I've had my 2000 A3 18T Auto about 3 months, it's only done 24,000 miles, full Audi history etc. When I turn the key it makes a really loud clicking noise, sounds like it's from the underside of the engine compartment. It's been impeccable up till this. Does it sound like a starter motor issue or the solenoid? Just thought I'd get someone’s opinion before I call a mechanic so I don't get ripped off.
Thanks

 

The original A3 (or Typ 8L) was introduced in the European market in 1996, marking Audi's return to the lower market segments since the demise of the Audi 50. This was the first Volkswagen Group model to use the "PQ34" or "A4" platform, bearing a natural close resemblance to its contemporary, the Volkswagen Golf Mk4. The car was initially available only with a three-door hatchback body, in order to present a more sporty image than the Golf, in both front- and four-wheel drive. All engines were an inline four-cylinder configuration, and were transversely mounted. After the A4, the Audi A3 was the second model in the Audi lineup to use five valves per cylinder.

 

Most likely the battery is the culprit.

 

Check all the wiring, still u dont find any fault take it to the mechanic.