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Toyota Corolla - Problems, Statistics, and Analysis

Toyota Corolla owners have reported a total of 11,543 problems for their cars built in the 25 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 (1,715 problems).

🔍 Common problems of Toyota Corolla

The following chart shows the 30 most common problems for Toyota Corolla cars. The number one most common problem is related to the vehicle's air bags (4,192 problems). The second most common problem is related to the vehicle's steering (1,077 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.

Table 3. Use PPMY Index to Compare Reliability Across Corolla Model Years Corolla

Model Year Problems Sales [1] Vehicle

Age PPMY Index 2019 89 187,356 1 0.48 2018 117 233,291 2 0.25 2017 184 317,480 3 0.19 2016 232 400,400 4 0.14 2015 227 368,205 5 0.12 2014 298 333,702 6 0.15 2013 233 308,962 7 0.11 2012 457 194,800 8 0.29 2011 652 223,369 9 0.32 2010 1,503 478,364 10 0.31 2009 1,715 363,515 11 0.43 2008 359 170,356 12 0.18 2007 938 309,550 13 0.23 2006 945 340,795 14 0.20 2005 934 368,744 15 0.17 2004 540 272,301 16 0.12 2003 822 330,420 17 0.15 2002 140 147,983 18 0.05 2001 162 230,246 19 0.04 2000 172 187,996 20 0.05

📊 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.