Exhaust Gas Temperature Sensor Rationality - Post Aftertreatment
2009-2013 Audi A3 2.0L TDI
Description
The exhaust gas temperature sensor after the aftertreatment system shows readings that do not correlate with upstream sensors and engine operating conditions.
Symptoms
- Check Engine Light
- Incorrect aftertreatment temperature monitoring
- DPF regen timing affected
- False overtemperature warnings
- Aftertreatment protection mode may activate incorrectly
Common Causes
- EGT sensor drift
- Sensor contaminated with soot
- Wiring resistance increased
- Sensor response time degraded
- Exhaust leak affecting sensor reading
Diagnostic Steps
- Compare pre and post aftertreatment EGT readings
- Test EGT sensor response time
- Measure sensor resistance at known temperature
- Inspect sensor for soot contamination
- Check for exhaust leaks near sensor
Repair Notes
Replace exhaust gas temperature sensor. Clean sensor bung of soot buildup. Verify temperature readings correlate after replacement.
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
P3892 on Other Vehicles
Common Questions
What does code P3892 mean on a 2009-2013 Audi A3?
P3892 stands for "Exhaust Gas Temperature Sensor Rationality - Post Aftertreatment". The exhaust gas temperature sensor after the aftertreatment system shows readings that do not correlate with upstream sensors and engine operating conditions.
What are the symptoms of P3892 on a Audi A3?
Common symptoms of P3892 include: Check Engine Light, Incorrect aftertreatment temperature monitoring, DPF regen timing affected, False overtemperature warnings, Aftertreatment protection mode may activate incorrectly.
What causes P3892 on a 2009-2013 Audi A3?
Common causes of P3892 include: EGT sensor drift, Sensor contaminated with soot, Wiring resistance increased, Sensor response time degraded, Exhaust leak affecting sensor reading.