2003 Nissan Altima O2 Sensor Light

Suggested Repair

Drive the car for about a week and watch whether the service engine soon light and the same codes return. The scan may only have cleared the codes, so replace the oxygen sensors only if the problem comes back.

Conversation Summary

The owner of a 2003 Nissan Altima 2.5S had a service engine soon light. A mechanic said both oxygen sensors needed replacement, but the light went out after a computer scan and the mechanic still insisted on replacement. The expert said the codes were likely cleared and advised driving for about a week, then addressing the sensors only if the same codes return.