P0473 is an OBD-II diagnostic trouble code that indicates an issue with the exhaust pressure sensor circuit. The exhaust pressure sensor measures the pressure in the exhaust system and sends this information to the engine control module (ECM).
When the ECM detects that the exhaust pressure is too high, it will illuminate the check engine light and store the P0473 code. This could be caused by a faulty exhaust pressure sensor, a clogged or damaged exhaust system, or an issue with the wiring or connections in the exhaust pressure sensor circuit.
To diagnose and fix this issue, the following steps can be taken:
Check the wiring and connections in the exhaust pressure sensor circuit for damage, corrosion, or loose connections. Repair or replace any damaged components as needed.
Inspect the exhaust system for any blockages or damage that could be causing an increase in exhaust pressure. Clear any blockages and repair any damage as needed.
Check the exhaust pressure sensor for proper operation using a scan tool. If the sensor is faulty, replace it with a new one.
After any repairs have been made, clear the P0473 code from the ECM and test drive the vehicle to ensure the issue has been resolved.
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