HO2S Heater Resistance Bank 1 Sensor 1
1997-2003 Audi A8 4.2L V8
Description
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.
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
P1102 on Other Vehicles
Common Questions
What does code P1102 mean on a 1997-2003 Audi A8?
P1102 stands for "HO2S Heater Resistance Bank 1 Sensor 1". 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.
What are the symptoms of P1102 on a Audi A8?
Common symptoms of P1102 include: Check Engine Light, Poor cold-start fuel economy, Extended warmup emissions, Failed emissions test.
What causes P1102 on a 1997-2003 Audi A8?
Common causes of P1102 include: Faulty O2 sensor heater element, High-resistance connection in heater circuit, Corroded O2 sensor connector, Blown heater circuit fuse.