Answer
Sometimes, but not always. Retailers often exclude sale, clearance or selected-brand products from promotional codes, so the offer terms and checkout result decide whether the code applies.
If a code is rejected, remove excluded products or compare the existing sale price with another eligible promotion. A headline discount does not override the retailer’s exclusions.
What to check before checkout
Read the retailer’s current promotion terms, confirm that the code applies to the items in your basket, and make sure the expected saving appears before you pay.