HO2S Heater Control Circuit (Bank 2, Sensor 3)
The oxygen sensor heater on Bank 2, Sensor 3 (downstream of the catalytic converter) isn't warming up properly, so the ECU can't get accurate readings. It's like a car engine that won't start because the starter motor is broken.
The ECU monitors the heater circuit voltage and current draw to ensure the O2 sensor reaches operating temperature quickly. The heater typically draws 0.5–2 amps at 12V and should heat the sensor to ~300°C within 10–30 seconds of engine start. If voltage or current is out of range, the ECU flags a fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Heater Circuit Current | 0.5–2.0 amps | <0.1 amp or >2.5 amps (open or short) |
| Heater Response Time | 10–30 seconds to reach operating temp | >60 seconds or no temperature rise detected |
Code P0062 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0062 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.