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Our Reliability History charts cover problems in any of 17 trouble areas.
#CARSOFT 7.4 DOES NOT READ TRANSMISSION DRIVER#
We do not currently publish scores for active driver assistance systems and airbags because problem rates in these areas are low or, in the case of airbags, because of recalls. Respondents to our surveys are asked to identify problems they have experienced in a 12-month period in any of 17 trouble spots. We will only publish the data if we feel the sample size is sufficiently large and indicative of the model. This gives us the ability to predict reliability of brand-new vehicles or ones that have been recently redesigned. When we have small sample sizes on vehicles, we may use brand history and the reliability of similar models that may share major components. A larger sample will always give more reliable information than a smaller sample (assuming, of course, that the data are valid and collected from an appropriate source).
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Given an appropriate sample, the more data you have, the more statistical confidence you have in your information. What Effect Does Having a Larger Sample Size for Some Vehicles Compared With Others Have on the Validity of the Reliability Data? That change shrank our respondent pool, but the internet-only surveys allow us to ask more in-depth questions and solicit detailed comments about problems. Since 2015, we use an online questionnaire exclusively instead of our previous mix of electronic and paper surveys from members. When we have small sample sizes for models, we may use brand history and the reliability of similar models that may share major components to determine our predictions. How Many Samples Do You Have of Each Model?Ī typical vehicle has about 200 to 300 samples for each model year. This high number of responses allows CR to provide the most comprehensive reliability information available to consumers.
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Our 2021 surveys, which were sent to members of Consumer Reports magazine and CR.org, gave us feedback on members’ experiences with over 300,000 vehicles. How Many Cars Do You Have Information on Overall?ĬR’s Auto Questionnaire is one of the largest scientific surveys conducted in the U.S. Respondents are asked about problems their vehicle experienced within the previous 12 months.ĭue to our continuous improvement process, in addition to adjusting for a vehicle’s mileage, CR is now adjusting for the vehicle owner’s age, based on our findings that older owners are more likely to report fewer problems.
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(See the full list of trouble spots below.)Īll the data was collected in the 2021 calendar year. They also tell us in writing (verbatim) specifically what their experiences were to help us understand precisely what problems they are having. Respondents check off problems from a list of trouble areas, ranging from the engine and transmission to climate system, brakes, electrical system, and power accessories. We ask them to include problems covered by warranty, but not the ones resulting from accident damage or due solely to recall. They are asked to identify problems that they considered serious (because of cost, failure, safety, or downtime). For reliability, we ask members to note any problems with their vehicles that occurred in the previous 12 months. Consumer Reports’ Survey Research Department conducts multiple Auto Surveys each year asking about reliability as well as satisfaction.