P1647
HO2 Sensor Control Malfunction Bank 2 Upstream
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$28–89 (est.)
Symptoms
- Check Engine light comes on
- Increased fuel consumption
- Unstable engine operation at idle
- Reduced engine power
- Increase in harmful emissions
Causes
- Bank 2 oxygen sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Engine control module (ECU) malfunction
- Problems with sensor ground
How to Fix
- Check the condition and connection of the oxygen sensor
- Check the integrity of wires and connectors in the sensor circuit
- Measure the resistance of the sensor heating element
- Check sensor signals with an oscilloscope
- If necessary, replace the oxygen sensor