Severity: Fix soon. Usually safe to drive for now.
The built-in heater that brings the first oxygen sensor up to working temperature quickly is not drawing the current the computer expects.
Check the heater fuse and wiring first, then replace the sensor — the heater is built into it.
Safe to drive. The sensor just takes longer to start working, so cold starts may use a little more fuel.
Generally safe to drive, but get it checked soon. Safe to drive. The sensor just takes longer to start working, so cold starts may use a little more fuel.
The most common causes are: Failed oxygen sensor heater; Blown fuse; Damaged wiring or connector; Failed sensor. A scan tool and a visual check of the parts above is where a technician starts.
Check the heater fuse and wiring first, then replace the sensor — the heater is built into it.
