The tests, carried out over three days in May in Barcelona, followed protests from the Red Bull and Ferrari teams that they contravened Formula One race laws.
The much-anticipated decision followed a day of hearings in Paris on Thursday, held by the FIA's international tribunal, at which both Mercedes and Pirelli defended their actions, saying they had no intention of disobeying the sport's regulations.
The issue has badly divided Formula One with Mercedes on one side and world championship rivals Red Bull and Ferrari on the other, and the FIA had a range of sanctions at its disposal, including fines and suspensions.
The tests were carried out by Mercedes drivers Lewis Hamilton and Nico Rosberg but under FIA rules such testing of tyres during the season, using the latest Formula One team cars, were banned.
Red Bull and Ferrari, sworn rivals of Mercedes for this years drivers' and constructors' championships, promptly lodged protests, claiming that the German team had been seeking to gain an unfair advantage and that Pirelli had been complicit.
Pirelli had reportedly been considering suing the FIA if the company was hit with a heavy penalty.
The issuing of simple reprimands had been proposed by Mercedes' lawyer Paul Harris at the end of Thursday's sessions.
In its ruling the FIA said: "The FIA wishes that lessons are learnt from this case and from the decision handed down.
"To this end, the FIA will make sure, in association with all F1 teams, that its control of the testings is strengthened.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
