We suggest having a smog check repair certified smog check station conduct a cylinder compression test on your Toyota Corolla.
NO stands for Nitrous Oxide. NOx is a chemical created when an engine's combustion chamber temperatures rises above 2500 Fahrenheit.
Carbon build-up within your Toyota Corolla's engine combustion chambers will cause increased engine temperature and high NOx. Carbon build-up normally develops in an engine's combustion chambers over an engine's lifetime, and much sooner on vehicles burning excessive oil.
The solution to this problem is called an Engine DeCarbonizing. It usually costs around two labor hours at a smog repair station. It will remove a good amount of carbon of your engine's piston heads and valves. This will increase combustion space, lower compression and lower NOx.
A compression test will indicate whether this is the fault causing your Toyota Corolla's high NO failure.
posted by SmogTips Support
