The site has been indexed, but some pages do not appear in searches at all. It appears when you "Request Indexing" in Search Console, but disappears again after a week or two. There is no manual penalty. What could be the reason? website and problematic pages: https://avto-servis.az/ehtiyat-hisseleri
So many reasons- Google de-indexing your pages due to low-quality or duplicate content, technical issues, or incorrect noindex/robots settings
Request indexing can force temporary discovery, but that doesn’t always mean Google wants to keep the page visible long term. I’d probably check content uniqueness, internal links, crawl paths, and whether similar pages already dominate the query.
Alter your robots file submit sitemaps and request indexing also make sure that your webpage is rich quality text guidlines
This is a classic sign of Google's automated quality filter or a canonicalization issue, especially common after the recent core updates. When you hit "Request Indexing", you essentially force a temporary pass where Google indexes the page provisionally. However, once the automated algorithms process the content against site-wide quality signals, if the page is flagged as thin, redundant, or lacking unique value, it gets dropped back out. Check your Search Console coverage report for those specific URLs. They usually end up under "Discovered - currently not indexed" or "Crawled - currently not indexed". If Google sees multiple pages on your site targeting almost identical intent, or if the content is mostly rehashed/generic without unique insights or first-hand value, Google simply decides it is not worth the crawl budget to keep it in the live index. Internal linking and user engagement also play a big role here. If these disappearing pages are buried deep in your site structure with very few internal links pointing to them, Google treats them as low priority. Try strengthening the internal links to those URLs from your top-performing pages, ensure the content provides genuinely unique value that isn't copied elsewhere on your site, and build out a clearer topic cluster instead of constantly resubmitting them manually.