AutoCodes - Audi - P0408 AUDI

P0408 AUDI Code - Exhaust Gas Recirculation Sensor 'B' Circuit High

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3
Table of contents

|P0408 AUDI code possible causes

  • Faulty Exhaust Gas Recirculation (EGR) Control Solenoid Valve
  • Faulty Exhaust Gas Recirculation Lift Sensor
  • Exhaust Gas Recirculation Lift Sensor harness is open or shorted
  • Exhaust Gas Recirculation Lift Sensor circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

|How do I fix the P0408 AUDI code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Cost of diagnosing the P0408 AUDI code

Labor: 1.0

The cost of diagnosing the P0408 AUDI code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0408 AUDI code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine hesitation

|P0408 AUDI code description

This Diagnostic Trouble Code (DTC) is stored in the Engine Control Module (ECM) when a fault is detected with the exhaust gas recirculation position sensor. The needle valve position is monitored by a potentiometer. And the exhaust gas flow is validated in one of three ways:
1. Mass airflow meter signal, the quantity of fresh air entering the engine will reduce proportionally as the exhaust gas entering the cylinder increases.
2. Manifold absolute pressure sensor signal, the pressure in the intake manifold will be altered depending on the introduction of exhaust gases. Comparatively higher pressure will exist when exhaust gases are recycled.
3. Exhaust gas differential pressure sensor, this component measures the pressure differential across two points to validate flow.
4. Wideband oxygen sensors, the signal from these sensors can be used to monitor the oxygen content in the exhaust gas.
OBDII Code P0408 Audi - Exhaust Gas Recirculation Sensor 'B' Circuit High - AutoCodes.com

|Need more information with the P0408 AUDI code?

Need more information on how to fix the P0408 AUDI code? Get Access to Factory Service Manuals

|Need help with a P0408 AUDI code?

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|P0408 AUDI code comments

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Repair Importance Level: 2
 
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