Code result
P2A05
O2 Sensor Circuit Range/Performance Bank 2 Sensor 3
Moderate severity
What it means
The third oxygen sensor on bank 2 (after a second catalyst stage on some vehicles) returns implausible values. Often related to sensor aging or mechanical exhaust leak upstream.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Sensor aging
highOne of the most commonly reported causes for this code — check this first.
Exhaust leak upstream
mediumA plausible cause — test and verify before replacing parts.
Sensor element aged beyond calibration window
lowLess common, but worth ruling out after the more likely causes.
Related help
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