Police staged surprise inspections of taxis at Helsinki Airport on Tuesday, which uncovered deficiencies in more than 60 percent of vehicles.
Police found problems in 25 of the 41 taxis inspected.
Ten cabbies were fined for not maintaining a driving log, while 15 were fined for various traffic violations.
There were an array of issues. In 15 taxis, the driver's name was not visible to the passenger, while four had insufficient price information, and two cars were not registered for use as taxis.
Despite repeated monitoring, cabdrivers regularly violate rules on the presentation of information for customers, police said in a press release.
"These deficiencies do not actually endanger traffic safety, but they affect the realisation of passenger and consumer rights," said Chief Adviser Pasi Hautalahti of the Finnish Transport and Communications Agency (Traficom).
Inspections of taxis in central Helsinki last month turned up shortcomings in more than a third of vehicles. Late last year, an Yle report found that taxi ranks in Helsinki have become territorial and violent.
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