Exhaust Pressure Sensor Circuit High
The P0473 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the exhaust back pressure sensor that is higher than the expected range. This sensor monitors exhaust pressure to optimize EGR flow and turbocharger operation. A high circuit condition typically points to a short to voltage, faulty sensor, or wiring issues.
1. Most Common Causes
- Faulty exhaust back pressure sensor
- Short to voltage in sensor circuit
- Damaged wiring or connector
- Corroded terminals
2. Symptoms You Will Notice
- Check Engine Light on
- Reduced engine power
- Poor fuel economy
- Rough idle or hesitation
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the sensor and wiring for damage or corrosion.
Step 3: Test sensor voltage with a multimeter; compare to manufacturer specs.
Step 4: Check for shorts to power or ground in the circuit.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced performance and potential damage to the exhaust system.
How much does it cost to fix?▼
Typically between $50 and $150 for parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.