If a car you are working on is experiencing a symptom where the brake lights won’t turn off, one possible issue could be the brake switch. It is located on the brake pedal. Inspect it for missing parts, such as the nipple not sitting properly in the groove or is completely missing.
If you are going to replace your upstream O2 sensor for a 2006 model (2.0L, non-PZEV,) be aware of the connector type you are using.
Just finished up upgrading my car’s audio equipment and environment. This post is about installation of custom-built tweeter pods. I drive a 2006 Ford Focus ZX4, which sadly did not come equipped with tweeter pods.