The former Arsenal man was left out of his side's Champions League last-16 first leg clash with Genk and took to social media to publish a picture of himself posing alongside a Mercedes S-class.
Wolfsburg are owned by rival car manufacturer Volkswagen, meaning Bendtner has landed himself in hot water.
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The 28-year-old has now been punished by the Bundesliga team, with the club's sporting director Klaus Allofs confirming: "This is a misbehaviour and in the end it will cost money."
Wolfsburg have clear rules for players and staff regarding other brands, with employees banned from turning up to training in any vehicle other than a Volkswagen.
Bendtner was fined £80,000 and suspended for one international appearance after he displayed sponsored underwear during a Euro 2012 game against Portugal.