Once the tires are properly inflated, drive the vehicle for a short distance (about 10-20 miles) at a speed above 20 mph. The system will then automatically re-learn the tire pressures and, if everything is correct, the warning light should turn off.
If the light *doesn't* turn off after driving, there might be a problem:
* A tire still has low pressure: Check all tires again, including the spare.
* A sensor is malfunctioning: One or more of the TPMS sensors in the wheels might be faulty. This requires professional diagnosis and potentially sensor replacement or repair.
* A system problem: There could be an issue with the TPMS system itself, requiring a mechanic's attention.
If you've checked the tire pressure and driven a significant distance and the light remains on, it's best to take your Impala to a tire shop or mechanic for diagnosis. They have the tools to properly read the TPMS system and identify any problems.
