"As for the European Central Bank's role in supporting growth, we, the French, are going to start a debate," Sarkozy told tens of thousands of supporters at the central Place de la Concorde in Paris.
The Financial Times reported that Sarkozy has broken a months-long agreement with German Chancellor Angela Merkel not to discuss in public the role of the ECB.
Sarkozy declared: "We cannot have taboo subjects. We cannot have banned debates".
Sarkozy is fighting an uphill battle ahead of the two-round election starting on 22 April, with polls placing his Socialist rival François Hollande up to 10 percentage points ahead in the 6 May runoff.
"If we do not change Europe, if we do not create a Europe of production, of investment, we cannot have growth. If the ECB does not support growth, we will not have enough growth," he said.
The ECB's mandate is to maintain price stability in the eurozone and does not include provisions for supporting or encouraging growth.
Sarkozy was part of the push behind the ECB's new lending programme to banks that helped calm market turmoil over the eurozone's debt woes. In his speech on Sunday, he appeared to be responding to Hollande who wants Europe to add pro-growth clauses to its new budget stability treaty.
Sarkozy's advisors say the president's aim is not to change the ECB’s statutes, because such a proposal is unlikely to be accepted by other eurozone partners, the daily Le Fiagaro reported. Rather, he wants to engage in a dialogue and convince the ECB to help by aiming for a more favourable exchange rate.