As far as I am aware, there is only three federal government agencies that have no legally enforceable code of ethics: the presidency, the SCOTUS, and the Federal Reserve, In many ways the Pentagon is included, but not officially.
A couple years ago, two of the regional banks were involved in a trading scandal.

Two years after the presidents of the Dallas and Boston Federal Reserve banks left their jobs amid revelations they had traded on financial markets while helping to set monetary policy, an internal watchdog has yet to finish a probe into a scandal that has clouded the U.S. central bank's reputation.

the Fed’s FOIA office is doing everything in its power to prevent internal documents relating to the scandals from reaching the light of day.

In fact, the Federal Reserve’s own Inspector General report acknowledged that Clarida made unaccounted-for trades and that Powell traded during a restricted period. Yet, he deemed these transgressions to be inadvertent oversights that didn’t amount to rule breaking. Such an inept, and inadequate, conclusion is impossible to separate from the fact that the Fed’s Inspector General is unique relative to its peers in that the IG serves at the leisure of the Board and is therefore neither independent nor truly reliable.

The scandals go beyond these examples. Atlanta Federal Reserve President Raphael Bostic's securities trades and investments has found he violated several of the central bank's ethics policies. However, the Fed's Office of Inspector General concluded there were no violations of federal insider trading or conflict of interest laws.
The biggest and most expensive scandal just surfaced recently, and involves Iraq.

In a startling revelation by the Wall Street Journal, a US-created banking system in Iraq is suspected of facilitating the transfer of billions of dollars to Iran and its allied terror groups, potentially circumventing international sanctions. The Wall Street Journal reports that this system, established after the 2003 US invasion of Iraq, allowed Iraqi banks to wire money internationally through the Federal Reserve Bank of New York without disclosing specific recipients. While these allegations are still under investigation, US officials believe that this oversight lapse may have provided a financial pipeline to sanctioned entities and terrorist organizations.

According to US officials, as much as 80% of daily wire transfers, amounting to over $250 million, were untraceable. A significant portion of these funds is believed to have reached Iran's Islamic Revolutionary Guard Corps (IRGC) and associated terror groups, including Hamas and Hezbollah, involved in the current war with Israel...Audits revealed that Ghulam's banks alone sent $3.5 billion outside Iraq in just six months, primarily in large round-dollar amounts to a handful of obscure companies in the UAE. These transactions raised red flags for potential money laundering activities.