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The best OBD2 scanners in 2021

Having one of the best OBD2 scanners on hand can be critical when your car’s check-engine light suddenly comes on, but nothing seems wrong. 

By tapping into the car’s computer systems, the onboard diagnostics (OBD) scanner can tell you whether the problem is caused by a faulty $30 gas cap, or by a bad catalytic converter that costs 20 times as much to replace.

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