Toyota Corolla - Problems, Statistics, and Analysis

Toyota Corolla owners have reported a total of 13,373 problems for their cars built in the 31 model years listed in the chart below. The chart shows the number of problems reported across all service years for each given model year of the Toyota Corolla. The 2009 Toyota Corolla cars have the most problems reported (1,752 problems).

🔍 Common problems of Toyota Corolla

The following chart shows the 35 most common problems for Toyota Corolla cars. The number one most common problem is related to the vehicle's air bags (4,471 problems). The second most common problem is related to the vehicle's engine and engine cooling (1,222 problems).

📉 Compare Reliability Across Model Years Using PPMY Index

It would not be fair to compare the Toyota Corolla of an older model year to newer model years since older vehicles have been in service longer and thus are expected to have more problems. In order to compare the reliability across Corolla model years, we use the PPMY index which is defined as the problems reported per thousand vehicles per Year. A smaller PPMY index indicates greater reliability of the given model year cars.

    PPMY = P / S / Y * 1000,

where P = total problems reported during the life of a Toyota Corolla model year; S = total units sold of the model year; Y = years since the debut of the model year (the age of the vehicle).

The results are shown in Table 3.

📊 Number of Problems Reported During the First Year

Another way to measure the reliability across the model years of the Toyota Corolla is to use the total number of problems reported during the vehicle's first year in service, as shown in the Table 4.

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☘ Corolla Service Bulletins

⚑ Corolla Safety Recalls

☤ Corolla Defect Investigations

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