Tensions stemming from the investigation into auto-industry titan Carlos Ghosn are hampering efforts at Renault SA and Nissan Motor Co. to shore up their globe-spanning alliance.
In recent weeks the two car makers have taken steps to restore the trust that people at both companies say was lost on Nov. 19 when Mr. Ghosn, then the chairman of both businesses, was arrested on suspicion of financial misconduct after a monthslong probe that Nissan conducted in secret. Mr. Ghosn has denied any wrongdoing.
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