P0420 is a diagnostic trouble code (DTC), which means your car’s catalyst system is not working as well as it...

The most efficient combustion engines use an air-fuel ratio of 14.7 parts air to 1 part fuel. A lean condition...

Code P0300 means your car’s multiple or random cylinders are misfiring. Most car engines have 4, 6, or 8 cylinders....

Imagine your morning was going swimmingly, and you were on your way to work on time. But then you tried...