How much is my honda civic si 1999 worth?

It has 112xxx miles and ac works good and car runs well

Here, you can appraise it's value yourself.

http://www.edmunds.com/appraisal/

It should be around 4500 or less because if the year. Mileage is good or excellent for a honda civic

MileageDealer Trade-In ValueConsumer Resale Value
RoughAverageCleanExcellent
120,001 - 130,000
$1,288$1,863$2,338$3,913
130,001 - 140,000
$1,175$1,750$2,225$3,800
140,001 - 150,000
$1,068$1,643$2,118$3,693
150,001 - 160,000
$968$1,543$2,018$3,593
160,001 - 170,000
$875$1,450$1,925$3,500
170,001 - 180,000
$788$1,363$1,838$3,413
180,001 - 190,000
$708$1,283$1,758$3,333
190,001 - 200,000
$635$1,210$1,685$3,260
200,001 - 210,000
$569$1,144$1,619$3,194
210,001 - 220,000
$510$1,085$1,560$3,135
So. A couple thousand probally. But it just depands where you go if you want to sell it [it seems like you are…]

Read more:
www.kbb.com/honda/civic/1999-honda-civi…

Here hope this helped!