P1646
Front Heated O2 Sensor Bank 1 Fault
2007-2016 Volvo S80 3.2L I6 🇨🇦
Moderate SeverityPowertrain
Description
The ECM detected a fault in the front (upstream) heated oxygen sensor on Bank 1. The sensor signal or heater circuit is not operating within specification.
Symptoms
- Check Engine Light
- Poor fuel economy
- Rough idle
- Failed emissions test
Common Causes
- Faulty O2 sensor Bank 1
- O2 sensor heater failure
- Exhaust leak near sensor
- Wiring damage to sensor
- Connector corrosion
Diagnostic Steps
- Test O2 sensor signal voltage and switching rate
- Test heater circuit resistance
- Check for exhaust leaks near sensor
- Inspect wiring and connector
- Compare Bank 1 vs Bank 2 sensor performance
Repair Notes
Replace the front heated O2 sensor on Bank 1.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1646 on Other Vehicles
Common Questions
What does code P1646 mean on a 2007-2016 Volvo S80?
P1646 stands for "Front Heated O2 Sensor Bank 1 Fault". The ECM detected a fault in the front (upstream) heated oxygen sensor on Bank 1. The sensor signal or heater circuit is not operating within specification.
What are the symptoms of P1646 on a Volvo S80?
Common symptoms of P1646 include: Check Engine Light, Poor fuel economy, Rough idle, Failed emissions test.
What causes P1646 on a 2007-2016 Volvo S80?
Common causes of P1646 include: Faulty O2 sensor Bank 1, O2 sensor heater failure, Exhaust leak near sensor, Wiring damage to sensor, Connector corrosion.