A row has erupted between Jevic and Kebs after the standards body put up a notice on its website stating that the contract between them and Jevic had been terminated.
Charles Munyori, the head of the Kenya Auto Bazaar Association, said the notice was contradictory.
A Japanese company at the centre of a vehicle inspection row has been allowed to continue checking cars until its contract expires in January.
The Kenya Bureau of Standards (Kebs) said any vehicle inspected by Japan Export Vehicle Inspection Centre Company Limited (Jevic) and which complies with Kebs requirements would be allowed in the country.