Remove Product from cart on checkout page by coding in magento

From magento cart you can delete product by clicking on delete button from cart page , but if you wish to delete any cart item in checkout page or by coding then you have write

 
$session= Mage::getSingleton('checkout/session');
$quote = $session->getQuote();
 
$cart = Mage::getModel('checkout/cart');
$cartItems = $cart->getItems();
foreach ($cartItems as $item)
{
    $quote->removeItem($item->getId())->save();
}

By writing the above code your all cart item will be delete.If you wish to delete a particular product from the cart session then instead of writing $item->getId() pass your Id of the product.

e.g: –

 
foreach ($cartItems as $item)
{
    if($item->getId()== 2) 
    { 
        $quote->removeItem($item->getId())->save(); 
    }
}