Exhaust Pressure Sensor Intermittent


Table of contents

P0474 AUDI Possible Causes

  • Faulty Exhaust Back Pressure Sensor
  • Exhaust Back Pressure Sensor harness is open or shorted
  • Exhaust Back Pressure Sensor circuit poor electrical connection

How do I fix code P0474 AUDI?

  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.

Tech Notes

  • Replacing the exhaust back pressure usually takes care of the problem

Cost of diagnosing the P0474 AUDI code

  The cost of diagnosing the P0474 AUDI code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected

  An Exhaust Back Pressure (EBP) signal that is detected out of range (high or low) by the Engine Control Module (ECM) will cause the engine to ignore the EBP signal and disable exhaust back pressure operation.

Possible Symptoms

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

P0474 AUDI Description

  The Exhaust Back Pressure (EBP) sensor is a variable capacitance sensor that, when supplied with a 5-volt reference signal from the Engine Control Module (ECM), produces a linear analog voltage signal that indicates pressure.
The EBP sensor’s primary function is to measure exhaust back pressure so that the ECM can control the exhaust back pressure regulator (EPR) when needed.

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