The homemade device was found in a suspect package in front of a shopping centre in the western suburb of Basaksehir after a passer-by raised the alarm, the official Anatolia news agency reported.
Police defused the device and took it to a laboratory for further investigation, it said. Reports described the device as a fragmentation bomb.
In another security alert Saturday, police detonated in controlled explosion gas cannisters that had been found in a suspicious package in the suburb of Sefakoy, Anatolia said.
The female suicide bomber and a policeman were killed in Tuesday's bombing in the Sultanahmet district, the location of most of the biggest historic tourist attractions in Istanbul.
An extreme leftist Turkish group initially claimed the attack but then retracted the claim, saying the first statement was an error.
Security has been high in Turkey over the past few months, amid fears of attacks by militants controlling parts of Iraq and Syria up to the Turkish border.
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And the strange question from the minister of Turkey, "Why is world tilting to Islamaphobia"