P1102moderate severityPowertrain
HO2S Heater Resistance Bank 1 Sensor 1
on 2011 Audi A4 2.0L Turbo I4 · AWD
What this code means
The ECU detected that the heater resistance in the upstream oxygen sensor on Bank 1 is outside the specified range. The heater brings the O2 sensor up to operating temperature quickly for accurate fuel trim control.
Symptoms
- Check Engine Light
- Poor cold-start fuel economy
- Extended warmup emissions
- Failed emissions test
Common causes
- Faulty O2 sensor heater element
- High-resistance connection in heater circuit
- Corroded O2 sensor connector
- Blown heater circuit fuse
Diagnostic steps
- Test O2 sensor heater resistance (should be 2-30 ohms)
- Check heater circuit fuse
- Inspect wiring and connector for corrosion
- Measure voltage at heater circuit
Repair notes
Replace the upstream O2 sensor on Bank 1 if heater resistance is out of specification.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1