Powertrain
Enriched, not yet reviewed
Lights the check engine lamp
P2A05: O2 Sensor Circuit Range/Performance Bank 2 Sensor 3
Standardized SAE J2012 code · P2Axx codes
What does P2A05 mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
- High Sensor aging
- Medium Exhaust leak upstream
- Low Sensor element aged beyond calibration window
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2A05 on the same make and model first.
P2A05 in the community
Ask about P2A05No one has posted about P2A05 yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your P2A05 problemRelated codes
- P2A00 O2 Sensor Circuit Range/Performance Bank 1 Sensor 1
- P2A01 O2 Sensor Circuit Range/Performance Bank 1 Sensor 2
- P2A02 O2 Sensor Circuit Range/Performance Bank 1 Sensor 3
- P2A03 O2 Sensor Circuit Range/Performance Bank 2 Sensor 1
- P2A04 O2 Sensor Circuit Range/Performance Bank 2 Sensor 2
- P2A06 O2 Sensor Circuit Range/Performance Bank 1 Sensor 4
- P2A07 O2 Sensor Circuit Range/Performance Bank 2 Sensor 4