Error code
OBD2 P0473
OBD2P0473
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Exhaust Pressure Sensor High.
Severity
moderateCan drive, but performance and fuel efficiency will be reduced.
Summary
P0473 indicates an issue with the exhaust pressure sensor (EPS) in your vehicle's exhaust system, specifically that it is providing abnormally high voltage readings to the ECM.
Symptoms
- Reduced engine performance
- Decreased fuel economy
Common Causes
- Faulty exhaust pressure sensor (EPS)
- Short circuit in EPS or its wiring harness
Diagnosis
- Use a scan tool to check live data for EPS and MAP readings.
- Perform circuit checks with a DVOM to identify any short circuits or high resistance issues.
Fixes
- Replace the faulty exhaust pressure sensor (EPS).
FAQ
What should I do if my EPS reads over 55 psi?
Suspect a faulty EPS or circuit problem and proceed with further diagnostic checks.
How can I prevent water damage to the EPS?
Ensure proper sealing of connectors and check for any signs of corrosion or bent pins.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- P0400Exhaust Gas Recirculation Flow
- P0401Exhaust Gas Recirculation Flow Insufficient Detected
- P0402Exhaust Gas Recirculation Flow Excessive Detected
- P0403Exhaust Gas Recirculation Control Circuit
- P0404Exhaust Gas Recirculation Control Circuit Range/Performance
- P0405Exhaust Gas Recirculation Sensor 'A' Circuit Low
- P0406Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0407Exhaust Gas Recirculation Sensor 'B' Circuit Low
- P0408Exhaust Gas Recirculation Sensor 'B' Circuit High
- P0409Exhaust Gas Recirculation Sensor 'A' Circuit
- P0410Secondary Air Injection System
- P0411Secondary Air Injection System Incorrect Flow Detected