I know a guy who bought an Audi buyback car ("immobilizer" issues) that did not show up as such on Carfax, nor did it show when he sold it a year later.

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DRIVER8

2017 Range Rover Sport Dynamic SC V8
2019 Jeep Wrangler Rubicon
2019 Ford F150 Limited

Allegheny Chapter BMW CCA
Mountain State Chapter BMW CCA