What are you specifically looking for during an anti-tampering check?

During an anti-tampering check, the primary focus is on identifying non-factory modifications made to a vehicle's emissions system. This is crucial because such modifications can adversely affect the vehicle's ability to control emissions, potentially leading to higher pollution levels and non-compliance with environmental regulations. By ensuring that the vehicle retains its factory specifications, inspectors can ascertain that the emissions control systems are functioning as intended, which is essential for maintaining air quality standards.

Factory-installed parts are less relevant in this context, as the emphasis is specifically on whether modifications have been made that deviate from the original manufacturer's design. While vehicle age and mileage can provide some insight into the wear and tear of components, they do not directly pertain to the integrity of the emissions system. Similarly, previous repair histories might be informative but do not specifically address whether any intentional alterations to the emissions system have been performed. Thus, the correct focus during an anti-tampering check is on any non-factory modifications that could compromise the emissions performance of the vehicle.