Final answer:
Manuals, visual tests, and audible tests are essential for diagnosing car problems accurately.
Explanation:
Manuals are the most helpful source of information when diagnosing a car problem as they provide detailed insights into the car's systems and troubleshooting procedures.
Visual tests and audible tests are crucial methods in diagnosing car issues, allowing mechanics to identify problems by observing and listening to the vehicle's performance.
Consulting sources like Car and Driver, Consumers Digest, and Consumers Report can provide reliable information when validating car problems, ensuring a more accurate diagnosis.
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