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.
MALFUNCTION A
To judge malfunctions of heated oxygen sensor 2, ECM monitors whether the voltage is unusually high during various driving conditions such as fuel cut.
MALFUNCTION B
To judge malfunctions of heated oxygen sensor 2, ECM monitors whether the minimum voltage of sensor is sufficiently low during various driving conditions such as fuel cut.
DTC DETECTION LOGIC
| DTC | CONSULT screen terms (Trouble diagnosis content) | DTC detection condition | ||
| P2A04-00 | HO2S2 (B2) (O2 sensor circuit range/performance bank 2 sensor 2) | A | Diagnosis condition | - |
| Signal (terminal) | Heated oxygen sensor 2 (bank 2) signal | |||
| Threshold | An excessively high voltage from the sensor is sent to ECM | |||
| Diagnosis delay time | - | |||
| B | Diagnosis condition | - | ||
| Signal (terminal) | Heated oxygen sensor 2 (bank 2) signal | |||
| Threshold | The minimum voltage from the sensor is not reached to the specified voltage | |||
| Diagnosis delay time | - | |||
POSSIBLE CAUSE
A
- Harness or connectors [The heated oxygen sensor 2 (bank 2) circuit is open or shorted.]
- Heated oxygen sensor 2 (bank 2)
B
- 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
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.