Which of the following emissions changes is least likely due to a clogged fuel injector?

A clogged fuel injector primarily affects the proper atomization and delivery of fuel to the combustion chamber, which can have a direct impact on the combustion process.

When a fuel injector is clogged, insufficient fuel may enter the combustion chamber, leading to an incomplete combustion process. This can hide or lead to lower concentrations of certain emissions. For example, carbon monoxide (CO) emissions can increase due to incomplete combustion because of the lack of fuel, resulting in more hydrocarbons not being fully oxidized. Conversely, carbon dioxide (CO2) emissions often decrease because the amount of fuel being burned is reduced, leading to less complete combustion overall, which would produce less CO2.

Nitrogen oxides (NOx) emissions are typically associated with high combustion temperatures and pressures. When there is inadequate fuel because of a clogged injector, the combustion temperatures may drop, potentially leading to decreased NOx emissions.

Oxygen (O2) emissions consist of unburned oxygen present in the exhaust. A clogged injector can lead to a rich mixture that consumes more oxygen from the intake, resulting in lower O2 emissions because there are lower amounts of unburned oxygen in the exhaust.

Thus, decreased O2 emissions are less likely to be affected or result from a