P0473NLT

P0473 is an OBD-II diagnostic trouble code meaning: Exhaust Pressure Sensor A Circuit High Input (part of the exhaust pressure sensor family, P0470–P0475).
Features (at a glance):
- Indicates the Exhaust Pressure Sensor A signal to the PCM is higher than expected.
- Affects exhaust backpressure sensing used for engine/emissions control.
Typical symptoms:
- Check Engine Light (MIL) illuminated
- Possible rough idle, reduced power or drivability issues
- Potential drop in fuel economy
Common causes:
- Damaged or corroded wiring/connector in the sensor A circuit
- Faulty Exhaust Pressure Sensor A
- Poor ground or short to voltage in the harness
- Exhaust leaks or obstructions affecting sensor readings
- PCM input circuit fault
What to inspect/repair:
- Visual inspection of wiring and connectors; repair/clean/replace as needed
- Measure sensor output with a scan tool and multimeter against spec
- Check for shorts to voltage/ground and for exhaust leaks
- Replace sensor if out of spec; repair wiring harness if damaged
- If faults persist, consider PCM/ECU inspection
Note: Correct diagnosis should rule out other P047x codes (A sensor family) first.

SOT-23-3 package (SC-70-3 variant).

Manufacturer: Nexperia.
What kind of company: Nexperia is a global semiconductor company that designs and manufactures discrete and logic components, including MOSFETs, diodes, and other power-management devices.