P0139
O2 Sensor Circuit Slow Response Bank 1 Sensor 2
2016-2016 Audi TT 2.0L Turbo I4
Low SeverityPowertrainGeneric (SAE)
The 2016 Audi TT is equipped with a 2.0L inline-4 turbocharged gasoline engine. Below you'll find detailed p0139 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The downstream O2 sensor on Bank 1 is responding too slowly.
Symptoms
- Check Engine Light
- Failed emissions
Common Causes
- Aging sensor
- Contaminated sensor
- Catalyst issue
Diagnostic Steps
- Monitor sensor response
- Check catalyst efficiency
Repair Notes
Replace downstream O2 sensor.
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
P0139 on Other Vehicles
Common Questions
What does code P0139 mean on a 2016-2016 Audi TT?
P0139 stands for "O2 Sensor Circuit Slow Response Bank 1 Sensor 2". The downstream O2 sensor on Bank 1 is responding too slowly.
What are the symptoms of P0139 on a Audi TT?
Common symptoms of P0139 include: Check Engine Light, Failed emissions.
What causes P0139 on a 2016-2016 Audi TT?
Common causes of P0139 include: Aging sensor, Contaminated sensor, Catalyst issue.
Last updated: March 2026