My Audi A4 is losing power, what could be the issue?

I've noticed that my Audi A4 is not accelerating as quickly as it used to. It also feels like it's struggling to maintain speed on the highway. What could be the problem?

There could be a few potential reasons for this issue. One possibility is that your air filter is clogged, which can restrict airflow and decrease engine performance. Another possibility is that your fuel filter may need to be replaced, causing fuel delivery issues. It may also be worth checking your spark plugs, as worn out or dirty spark plugs can impact engine power. A certified mechanic will be able to diagnose and fix the issue for you.

Have you checked your transmission fluid levels? Low levels can cause shifting issues and result in a loss of power. It's also possible that your catalytic converter is clogged, which can hinder exhaust flow and reduce engine power. It's always a good idea to do routine maintenance and regularly check your car's vital fluids.

I had a similar issue with my Audi A4 and it turned out to be a faulty oxygen sensor. This can cause an imbalance in your fuel-to-air ratio and result in a loss of power. I recommend taking your car to a dealership for a diagnostic test to pinpoint the exact cause of the issue.