The vehicle may have an up-shift light.
When this light comes on, shift to the next higher gear if weather, road, and traffic conditions allow.
See Manual Transmission Operation for more information.
Chevrolet Cobalt Service & Repair Manual. Catalytic Converter R&R
1.
Raise and support vehicle.
2.
Remove wheel drive shaft heat shield.
3.
Remove Heated Oxygen Sensor (HO2S).
4.
Remove catalytic converter to resonator
pipe nuts, Fig. 1.
...