Chinese car sales rose at their slowest pace in 19 months in September amid a weakened economy and rising inventories.

For foreign automobile makers, which increasingly have counted on consumers in the world's largest car market to offset weakness elsewhere, the slowdown in economic growth adds to pressures that include increased regulatory scrutiny.

China's passenger-car sales last month rose 6.4% from a year earlier to about 1.7 million vehicles, according to data released on Monday by the China Association of Automobile Manufacturers, a government-backed industry group. Growth in total sales of automobiles including passenger and commercial vehicles slowed to a 2.5% increase from a 20% gain a year earlier.

September's passenger-car sales performance was the weakest since sales fell in February 2013, a month when China's weeklong Spring Festival holiday closed car lots. Industry analysts said the latest results were below expectations for a traditionally strong month. Car makers and dealers usually boost marketing efforts in September to attract consumers ahead of the weeklong National Day holiday that started Oct. 1.

Foreign auto makers, as a whole, have overcome the industry's slower growth by taking market share from Chinese brands. On Monday, CAAM said foreign auto makers again increased their share of the Chinese passenger vehicle market, to 62.4% in the first three quarters of the year from 60% in the year-ago period.

But now smaller sales gains are being notched by foreign auto makers as well. Volkswagen AG's China sales in September rose 6.7% from a year earlier, compared with an 11% increase for August. One of Toyota Motor Corp.'s Chinese joint ventures, FAW Toyota Motor Co., slashed its sales target by 6% this year, citing a sluggish economy and high inventory at dealers.

On Monday, Credit Suisse cut its price target for BMW AG shares in part because it said the German car maker's China sales were weaker than expected. Sales of BMW and Mini brands in China rose less than 4% in September to about 37,111 cars, the report said. BMW, which said it doesn't comment on outside estimates, said it is confident it will hit moderate sales growth by the end of the year.

"The economic situation has had a spillover effect on the car industry, especially in midsize cities with a population of about five million, where economies are facing greater downward pressure," said Peng Bo, a consultant with Strategy&. He expects China's passenger car sales to rise up as much as 10% this year, compared with a 16% gain in 2013.

Jessica Zhu, a 34-year-old Shanghai bank credit manager, is putting off a car purchase. She figures it is too expensive and troublesome to own a car. "Driving in big cities like Shanghai is not that pleasant," she said. "Parking is getting more expensive and difficult. You will also have to worry about maintenance issues from time to time."

Fang Yongbin, 36, who works in the publishing industry, echoed those concerns. "On top of the one-off car-purchasing cost, you should spend at least 20,000 yuan ($3,300) a year to maintain a car. That is too expensive," he said. "Since public transportation has significantly improved in Shanghai, I don't think it is necessary to own a car."

According to the China Automobile Dealers Association, a trade group, inventories at dealers stood at about 45 days in September, up from 36 days in the year-earlier period. Luo Lei, an executive at CADA, said the inventories of imported cars were running at about two months because demand for such cars slowed as growth has weakened.

At a briefing in Beijing on Monday, Yao Jie, a CAAM deputy secretary-general, said an index measuring the prosperity of the auto industry fell 3.4 percentage points in the third quarter from the second quarter. "Inventories are continuing to increase," he said, without disclosing further details.

China remains a stronger growth engine than the U.S. and Europe, and continues to be a source of strength for many car makers. General Motors Co.'s sales in China rose 15% last month compared with a year earlier. Ford Motor Co.'s car sales fell 4% in September from a year ago, the auto maker's first monthly drop in more than two years, but analysts attributed that decline to capacity constraints.

China's first-quarter economic growth came in at 7.4% compared with a year earlier, its slowest pace in 18 months. Second-quarter growth rose slightly to 7.5%, but measures of trade, property prices and manufacturing activity suggest momentum slipped in the third quarter.

Ye Sheng, an analyst at market research firm Ipsos, said pressure from Beijing could be contributing to weakening sales.

A number of foreign auto makers have faced scrutiny from antitrust regulators over their business practices with dealers as well as their pricing of spare parts and services. Mr. Ye said that could affect the car association's sales figures because they measure wholesale deliveries to dealers, not retail figures.

"Auto makers had usually pressed dealers to take more orders than they needed. But such pressure on dealers has eased due to the antitrust move," he said.

China in September levied a combined $45.8 million fine against local affiliates of Volkswagen's Audi AG arm and Chrysler, owned by Fiat Chrysler Automobiles NV, after alleging they manipulated prices of vehicles and parts.

Other auto makers that have been the subject of antitrust investigations include BMW, Daimler AG and Tata Motors Ltd.'s Jaguar Land Rover unit. The companies have said they were cooperating with the probes.

-- Rose Yu and Lilian Lin contributed to this article.

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