Renault has warned that revenue may decline this year, scrapping a previous goal.

This comes after the company's first-half profit was hit by weakening car demand and an earnings collapse at alliance partner Nissan in the wake of the Carlos Ghosn scandal. 

Net income slumped by more than half to €970m in the six months from January to June as revenue fell 6.4% to €28.05 billion, the French carmaker said today. 

Operating profit also dropped 13.6% to €1.654 billion. 

"Given the degradation in demand, the group now expects 2019 revenues to be close to last year's," Renault predicted - abandoning an earlier pledge to increase revenue before currency effects.

A broad-based downturn has rattled the sector, prompting profit warnings and compounding challenges for Renault and Nissan as they struggle to turn the page on the Ghosn era. 

Their former alliance boss is now awaiting trial in Japan on financial misconduct he denies.

Renault's bottom line was hit by an €826m drop in earnings from its 43.4%-owned alliance partner. 

Nissan is cutting 12,500 jobs globally after an earnings collapse that it is keen to blame on Ghosn's leadership. 

But Renault's own performance - reflected an operating margin that declined to 5.9% from 6.4% - contrasts less favourably with domestic rival PSA Group. 

The Peugeot maker defied the downturn with a record 8.7% profit margin unveiled earlier this week. 

Renault blamed falling sales in France, as well as Turkey and Argentina, for a 7.7% revenue drop at its core automotive business - whose profit margin slid to 4% from 4.5%. 

Operating free cash flow also suffered, coming in at a negative €716m as investment jumped by €742m to €2.91 billion. 

The company nonetheless reiterated pledges to deliver positive full-year cash flow and a margin close to 6%.