OBD-II Generic Error Code P0473: How to Fix Exhaust Pressure Sensor High

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
P0473
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code P0473 indicates the exhaust back pressure sensor is reading abnormally high voltage, often due to a clogged DPF, faulty sensor, or exhaust restriction. This guide helps you diagnose and resolve the issue safely.
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Tools You'll Need

How to Fix Error Code P0473

  1. Check for Exhaust Leaks

    Let the engine cool completely before touching any exhaust components to avoid burns.

  2. Test the Exhaust Pressure Sensor

  3. Inspect Wiring and Connectors

    Disconnect the battery negative terminal before working on electrical components.

  4. Check for Exhaust Blockage

    DPF cleaning may require special equipment; do not attempt to force-clean it yourself.

  5. Replace the Exhaust Pressure Sensor

    Use a replacement sensor that matches your vehicle's OEM specifications.

Parts You May Need

Exhaust Pressure Sensor
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O-ring or gasket for sensor
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Exhaust Pressure Sensor
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O-ring or gasket for sensor
Check Price on Amazon
Exhaust Pressure Sensor
Check Price on Amazon
O-ring or gasket for sensor
Check Price on Amazon
Exhaust Pressure Sensor
Check Price on Amazon
O-ring or gasket for sensor
Check Price on Amazon
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When to Call a Professional

If you suspect a clogged DPF or catalytic converter, or if the sensor replacement and wiring checks don't clear the code, consult a professional mechanic. Advanced diagnostics like exhaust back pressure testing require specialized tools.

Frequently Asked Questions

Can I drive with error code P0473?
It's not recommended for long distances. High exhaust back pressure can reduce engine performance, increase fuel consumption, and potentially damage the DPF or turbocharger.
What causes P0473 besides a bad sensor?
Common causes include a clogged DPF, restricted catalytic converter, exhaust leaks, or wiring issues. In some cases, a faulty ECM can also trigger the code.
How much does it cost to fix P0473?
If it's just the sensor, the part costs $30-$100 plus labor. DPF cleaning or replacement can cost $500-$2,000 or more.
Will clearing the code fix P0473?
Clearing the code may temporarily turn off the check engine light, but if the underlying issue isn't fixed, the code will return.
What is the exhaust pressure sensor function?
It monitors back pressure in the exhaust system to help the engine control unit (ECU) manage DPF regeneration and turbocharger operation.

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