PHP search with PDO - php

Question

I am trying to convert search function from one tutorial from mysql into PDO. I need to search inside of my table. With my limited knowledge I was able to do this. However, there are still some things I cannot resolve. What I am missing?
When searching no matter what I search I still get no result.
ORIGINAL
if(isset($_GET['keywords'])){
$keywords = $db->escape_string($_GET['keywords']);
$query = $db->query(
"SELECT name, description
FROM cars
WHERE name LIKE '%{$keywords}%' OR description LIKE '%{$keywords}%'
");
?>
<div class="result-count">
Found <?php echo $query->num_rows; ?> results.
</div>
<?php
if($query->num_rows){
while ($r = $query->fetch_object()) {
?>
<div class="result">
<?php echo $r->name; ?>
</div>
<?php
}
}
}
?>
PDO version/my version
<?php
include 'inc/header.php';
if(isset($_GET['keywords'])){
$keywords = $_GET['keywords'];
$cars = $db->prepare("SELECT name, description FROM cars WHERE name LIKE '%{$keywords}%' OR description LIKE '%{$keywords}%'
");
$cars->execute();
?>
<div class="result-count">
Found <?php echo $cars->rowCount(); ?> results.
</div>
<?php
if($cars->rowCount()){
while($r = $cars->fetchObject()){
?>
<div class="result">
<?php echo $r->name; ?>
</div>
<?php
}
}
}
?>
Html
<form action="search.php" method="get">
<label>
<input type="text" name="keywords" value="SEARCH" autocomplete="off">
</label>
<input type="submit" value="Search">
</form>