
Multiple Trouble Codes.
But Were the Sensors Really Bad?
A customer’s truck was showing multiple oxygen-sensor and EVAP-related trouble codes.
It would have been easy to assume the sensors needed replacing.
But our diagnostic testing revealed a blown fuse affecting the circuits. After replacing the fuse, live scan-tool data confirmed the oxygen sensors were functioning.
The fuse issue later returned, requiring further investigation, but the initial testing helped us avoid recommending oxygen-sensor replacements without evidence they were faulty.
“A trouble code tells us where to investigate—not which part to replace.”



