Final answer:
A DTC for an oxygen sensor fault in a vehicle can result in improper fuel economy, increased emissions, and reduced engine performance due to incorrect air-fuel mixture adjustments.
Step-by-step explanation:
When a vehicle stores a DTC (Diagnostic Trouble Code) for an oxygen sensor fault, it could lead to several potential issues. These issues include improper fuel economy, increased emissions, and potentially a decrease in engine performance. The oxygen sensor plays a crucial role in the vehicle's engine management system by measuring the amount of oxygen in the exhaust gas.
This information is used by the vehicle's computer to adjust the air-fuel mixture for optimal combustion. A fault in the oxygen sensor can cause incorrect readings, leading the engine to run too lean (not enough fuel) or too rich (too much fuel), resulting in poor performance and higher emissions.