Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC Description
The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity of the three way catalyst 1 causes the longer switching time. To judge malfunctions of heated oxygen sensor 2, ECM monitors whether the maximum voltage of the sensor is sufficiently high during various driving conditions such as fuel-cut.
| : 0.72 V |
DTC DETECTION LOGIC
| DTC | CONSULT screen terms (Trouble diagnosis content) | DTC detection condition | |
| P2273-00 | HO2S2 (B2) (O2 sensor signal biased/stuck rich bank 2 sensor 2) | Diagnosis condition | - |
| Signal (terminal) | Heated oxygen sensor 2 (bank 2) signal | ||
| Threshold |
|
||
| Diagnosis delay time | - | ||
POSSIBLE CAUSE
- Harness or connectors [The heated oxygen sensor 2 (bank 2) circuit is open or shorted.]
- Heated oxygen sensor 2 (bank 2)
- Fuel pressure
- Fuel injector
- Intake air leaks
FAIL-SAFE
Not applicable
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.