How accurate are the readings from an OBD scanner?

The accuracy of readings from an OBD scanner can vary depending on several factors. Overall, OBD scanners provide highly accurate readings as they directly retrieve data from a vehicle's onboard computer system. However, the accuracy may be affected by the quality and reliability of the scanner itself, as well as the condition of the vehicle. Different scanners may have varying levels of precision, so it is important to choose a reliable brand or reputable scanner. Furthermore, if there are issues with the vehicle's sensors, wiring, or computer system, it may result in less accurate readings. Regular maintenance and ensuring the scanner is properly calibrated can help maintain accuracy. While OBD scanners are generally accurate, it is always recommended to consult with a professional mechanic for a comprehensive analysis and diagnosis of any issues.