Why do Audi 80 models experience high carbon monoxide emissions?

I have noticed that my Audi 80 has been emitting higher than average levels of carbon monoxide during emissions tests. Is this a common issue with Audi 80 models, and how can I address it?

The reason for high carbon monoxide emissions in Audi 80 models is often due to a faulty oxygen sensor. This component measures the amount of oxygen in the exhaust and relays this information to the engine's computer, which adjusts the fuel mixture accordingly. A faulty sensor can cause the engine to run rich, resulting in higher carbon monoxide emissions. It is important to get this sensor checked and replaced if needed.

Another common cause of high carbon monoxide emissions in Audi 80 models is a dirty or clogged air filter. This prevents the proper amount of air from entering the engine, causing it to run rich and produce higher levels of carbon monoxide. It is recommended to regularly change your car's air filter to avoid this issue.