CHONGQING, China—A surprise sales slump is hitting what had been a fast-growing part of the world's biggest car market. That could be bad news for mass-market global brands like Volkswagen AG and Ford Motor Co. and luxury names such as Mercedes-Benz and BMW AG alike.

The global auto industry has, in recent years, been betting on China's west, where they see potential for faster growth than in the more affluent—and car-saturated—cities along the coast and in the country's eastern and southern manufacturing belts.

Instead, the region has been hard hit by China's economic slowdown, curbing auto sales and leaving residents like Chen Liang pinching pennies. On Wednesday, at an auto show in the sprawling western city of Chongqing, the 24-year-old junior manager for a laptop maker inspected a Chevrolet Aveo sedan, which sells for just under his budget of 100,000 yuan (US$16,120), once a 10,000 yuan discount is factored in.

The cost of living in Chongqing is comparable to Shanghai, Mr. Chen said. "But the salaries here are much lower," he said.

An analysis of new-car registration data by Chinese automotive research firm Ways Consulting Co. shows first-quarter sales across 12 western provinces grew about 12% from a year earlier to 1.2 million vehicles. That trails a 15% rise over the same period for the country as a whole, and represents a shift from a year ago, when western provinces outgrew the rest of the country. New-car registrations are considered a proxy for auto sales.

Luxury sales appear even worse. The Ways data show registrations of new Mercedes-Benz vehicles in the western province of Sichuan fell 6.9% in the first quarter to 3,944 cars, compared with a 50% rise in the same period a year earlier. Registration for BMW cars fell 9.1% in the first quarter to 5,450 cars from a 36% year-over-year increase in the same period in 2014, according to Ways.

A spokesman for Mercedes-Benz parent Daimler AG said the company shipped 17% more Mercedes-Benz cars to Chinese consumers in the first quarter compared with the year-earlier period. It doesn't break out sales by region. BMW said it doesn't comment on third-party numbers.

Discounting from auto makers contributes to the slowdown, say observers. Fu Lichuan, a Chongqing economic policy official, says that when prices are being cut, "people will hold off on their purchase plans, anticipating bigger discounts ahead."

On Wednesday, the government-backed China Association of Automobile Manufacturers industry group said new passenger car sales grew only 1.2% in May from a year earlier to 1.6 million vehicles—the weakest expansion since February 2013. The results were based on vehicles shipped to dealers rather than sales to consumers.

Volumes are still small in the west compared with more-developed areas. Still, car ownership in inland provinces looks "over-penetrated" as many less-affluent cities have seen car ownership rise faster than the national average, said Robin Zhu, an analyst an analyst at banker Sanford C. Bernstein. Car makers "will find that the bulk of their demand still comes from the traditional coastal and central regions," said Mr. Zhu.

Foreign auto executives have in recent years focused on China's west as a growth market. In 2012, Volkswagen unveiled its "Go West" strategy, a key part of its plan to spend €14 billion (US$15.8 billion) through 2016 to expand production in China. The effort included expanding both production and sales in the west. "In Western China in particular, the group is expecting a strong rise in purchasing power over the coming years," said Jochem Heizmann, chief executive of Volkswagen Group China, in 2013.

Two years ago, Ford China CEO John Lawler said company officials "expect to see a lot of the growth pushing west." Ford has expanded its dealer network from 540 in 2013 to more than 800. Nearly 40% of its new dealerships built since 2011 are located in the western region, said a Ford spokeswoman. She said figures for sales in the west weren't available.

General Motors Co. President Dan Ammann told reporters in April last year that the company would add 700 dealers in central and western China to sell Chevrolet and Buick models by 2017. A GM spokeswoman said its growth has outpaced the industry both countrywide and in the west this year, though recent data weren't available.

According to Autohome, a Chinese auto news website, Chengdu—the capital of Sichuan province with a population of 14.2 million—has about 380 car dealers, meaning there is one dealer for roughly every 37,000 residents. By comparison, the more-developed northern Chinese city of Tianjin, a city with a population of 14.7 million, has about 51,000 residents per dealership, while China's financial capital of Shanghai has about 42,000 people per dealership.

The combined gross domestic product in the 12 western provinces grew 6.2% in the first quarter of this year from a year earlier, lower than the 7% the country recorded, according to data provider Wind Information. A recent study by research firm Nielsen showed that consumer confidence was lower in the west than in other regions.

Foreign auto companies have also pushed west for manufacturing, though driven more by incentives and the potential for cheaper labor than sales. Beijing has encouraged the moves as part of its effort to bring development to the country's interior. Two years ago the government gave preferential lending and tax treatment to foreign auto investment in the west.

By the end of last year, Chengdu was home to 21 auto makers and 246 auto-parts companies, employing more than 80,000 people in the local automotive industry, according to the local government. In nearby Chongqing, Ford and its Chinese partner added a new $600 million car-manufacturing facility last year, making the southwestern Chinese city the biggest production base for the company outside of its home in Michigan.

Rose Yu in Shanghai and Colum Murphy in Chongqing contributed to this article.

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