HO2S Heater Resistance Bank 1 Sensor 2
1996-1996 Audi A6 2.8L V6
The 1996 Audi A6 is equipped with a 2.8L V6 engine. Below you'll find detailed p1105 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The ECU detected that the heater resistance in the downstream oxygen sensor on Bank 1 is outside the expected range. The downstream sensor monitors catalytic converter efficiency and requires proper heater function.
Symptoms
- Check Engine Light
- Failed emissions test
- Poor catalyst monitoring
- Slightly reduced fuel economy
Common Causes
- Faulty downstream O2 sensor heater
- High resistance in heater wiring
- Corroded connector at sensor
- Heater relay failure
Diagnostic Steps
- Test downstream O2 sensor heater resistance
- Inspect connector for corrosion
- Check heater circuit wiring
- Test heater relay operation
Repair Notes
Replace the downstream 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
P1105 on Other Vehicles
Common Questions
What does code P1105 mean on a 1996-1996 Audi A6?
P1105 stands for "HO2S Heater Resistance Bank 1 Sensor 2". The ECU detected that the heater resistance in the downstream oxygen sensor on Bank 1 is outside the expected range. The downstream sensor monitors catalytic converter efficiency and requires proper heater function.
What are the symptoms of P1105 on a Audi A6?
Common symptoms of P1105 include: Check Engine Light, Failed emissions test, Poor catalyst monitoring, Slightly reduced fuel economy.
What causes P1105 on a 1996-1996 Audi A6?
Common causes of P1105 include: Faulty downstream O2 sensor heater, High resistance in heater wiring, Corroded connector at sensor, Heater relay failure.
Last updated: March 2026