top of page

P0478

Overview

Code

P0478

Code Type

P

Code Class

P0

System

Emissions

Severity Level

Medium

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0478 indicates an exhaust pressure sensor circuit range issue

Symptoms

Loss of power

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

Exhaust pressure sensor performance

Possible Causes

Wiring issues

Diagnostic Steps

1 Inspect wiring 2 Test sensor output

Drive Safety Notes

Exhaust flow limited

bottom of page