Many WooCommerce shop owners are puzzled to see that searching SKU numbers doesn’t work out of the box. Thankfully SearchWP makes searching WooCommerce SKUs super easy!
Enable SKU searches in WooCommerce
To enable searching by WooCommerce SKU, add a Custom Field to your engine with a value of _sku and any weight you’d like:
Once you’ve saved your engine configuration SearchWP will make your SKUs searchable.