What Does P0472 Mean?
The exhaust pressure sensor is reading below the minimum expected value, indicating a low signal condition. This typically means the sensor is reading too low a pressure for the current engine operating conditions, or the signal voltage is below the valid range. On turbocharged and diesel engines, this can cause incorrect turbo boost control and failed DPF regeneration cycles.
Common Causes
30%
Exhaust pressure sensor signal wire shorted to ground
25%
Blocked or disconnected exhaust pressure sensor line causing false low reading
20%
Failed exhaust pressure sensor reading low
15%
Large exhaust leak before the sensor location reducing measured backpressure
10%
Corroded connector causing voltage drop on the signal circuit
Diagnostic Steps
1
Check the exhaust pressure sensor PID at idle — it should read a small positive value above atmospheric. A reading of 0 or near 0 suggests a blocked line or sensor failure.
2
Disconnect the exhaust pressure sensor and check for 5V reference voltage at the connector. If present, the sensor should output a minimum resting voltage (typically 0.5V) — lower than this indicates a short or sensor fault.
3
Inspect the pressure line from the exhaust to the sensor. Blow compressed air through it to confirm it is clear. Reconnect and retest.
4
Check the signal wire for shorts to ground by disconnecting both ends (sensor and ECM) and measuring resistance to chassis ground. Should read OL (infinite).
5
Listen and visually inspect for exhaust leaks upstream of the sensor location. A significant leak will reduce the backpressure the sensor measures, causing a genuine low reading.
Estimated Repair Cost
$80 - $450
Parts + labor, varies by vehicle and location
The exhaust pressure sensor is reading below the minimum expected value, indicating a low signal condition. This typically means the sensor is reading too low a pressure for the current engine operating conditions, or the signal voltage is below the valid range. On turbocharged and diesel engines, t...
The most common cause of P0472 (Exhaust Pressure Sensor Range/Performance) is: Exhaust pressure sensor signal wire shorted to ground
Typical repair costs for P0472 range from $80 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Reduced engine performance and possible limp mode on turbocharged vehicles. On diesel vehicles, the DPF may not regenerate properly, potentially leading to a clogged filter and further performance loss. Safe to drive carefully but repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0472 to identify the root cause.
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Quick Info
Category
Powertrain
System
Exhaust / Turbo / DPF System
Difficulty
Type
Generic (SAE)
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