Here are some common reasons for failing that all-important test -
1. A bad muffler.
2. Defective spark plugs.
3. A faulty oxygen sensor.
4. Simply a loose gas cap.
You can probably DIY that last one. For the many other reasons why your German Made vehicle may have failed its annual smog test, make an appointment at The German Car Shoppe in Littleton. Drivers in the Denver area have been counting on them for auto repair for a very long time. Just call (303) 798-2287. For all of their services please visit thegermancarshoppe.com.