He disclosed that in addition to losing their jobs, some of those found wanting had been prosecuted and jailed.
About 2000 staff members of the Nigerian Customs Service have been dismissed in the last seven years.
Comptroller General of Customs, Hameed Ali revealed this when he featured in the media briefing coordinated by the Presidential Media Team on Thursday in Abuja.
He said the service abhors corruption and has zero tolerance for such officers.
He disclosed that in addition to losing their jobs, some of those found wanting had been prosecuted and jailed.
According to Ali, many of those who have been shown the way out were found to be shortchanging the Service in its revenue drive, especially on the duties tax that should accrue to the organisation for imported vehicles.
The Customs boss also revealed that some importers found to have engaged in sharp practices which had infringed on the activities of the Service have either been suspended or prosecuted.
He said he was committed to ensuring excellent services but hopes his successor will maintain the standard.