Quick Answer
P0473 means: P0473 indicates a problem with the exhaust pressure sensor's performance.
Can I drive with P0473? It's crucial to address this issue promptly to avoid severe engine problems.
Common Questions
What does P0473 mean and how does it affect my car?
The P0473 code indicates a malfunction in the exhaust pressure sensor, which can disrupt engine performance and emissions control. If ignored, it may lead to reduced power and efficiency over time.
What are the most common causes of P0473 and how much does it cost to fix?
Common causes include a faulty exhaust pressure sensor, damaged wiring, and exhaust blockages. Repair costs range from $100 to $500, depending on the issue.
Can I drive my car with P0473 or should I stop immediately?
While you may still drive your vehicle, it's not advisable to ignore the P0473 code. Continuing to drive can lead to more severe engine damage and increased repair costs.
How can I diagnose P0473 myself using GeekOBD APP?
Use the GeekOBD APP to scan for codes and review freeze frame data for insights into the fault. Check the exhaust pressure sensor readings and compare them to manufacturer specifications.
What vehicles are most commonly affected by P0473?
P0473 is frequently seen in diesel engines, especially in models like the 2003-2007 Ford F-250 and 2004-2007 Dodge Ram 2500. Always check for manufacturer recalls or bulletins.
How can I prevent P0473 from happening again?
Regular maintenance on your exhaust system, including timely DPF cleaning and checking electrical connections, can help prevent future occurrences of the P0473 code.
What is P0473?
The diagnostic trouble code (DTC) P0473 indicates a problem with the exhaust pressure sensor's range or performance. This sensor plays a crucial role in monitoring exhaust gas pressure in diesel engines to optimize performance and emissions. When the engine control module (ECM) detects that the exhaust pressure reading is outside the expected range, it sets the P0473 code. This can lead to reduced engine efficiency, increased emissions, and potential long-term damage to the engine if not addressed. Common vehicles affected by this code include the 2003-2007 Ford F-250, 2004-2007 Dodge Ram 2500, and many others equipped with diesel engines. Symptoms often include poor acceleration, decreased fuel economy, and a check engine light. Addressing this code typically involves inspecting the exhaust pressure sensor, its wiring, and the exhaust system for blockages or leaks. Ignoring the P0473 code can result in more significant issues down the road, making it essential to diagnose and fix the problem promptly.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0473 is present:
- The check engine light stays on constantly, indicating a persistent issue with the exhaust system.
- Engine performance may be compromised, with noticeable hesitation and reduced power during acceleration, making driving feel unresponsive.
- Fuel economy might decrease by 10-20%, leading to frequent trips to the gas station and increased costs.
- You may notice unusual exhaust smoke or odor, which can indicate incomplete combustion or excessive soot.
- Strange noises such as hissing or rattling from the exhaust system may also occur, especially during acceleration.
Possible Causes
Most common causes of P0473 (ordered by frequency):
- The most common cause of P0473 is a faulty exhaust pressure sensor, which occurs in approximately 60% of cases. This sensor may fail due to age or exposure to harsh conditions.
- Another frequent cause is damaged wiring or poor connections, which can affect the signal sent to the ECM. Inspecting the wiring harness for frays or corrosion can prevent this issue.
- Exhaust system blockages, such as soot buildup in the diesel particulate filter (DPF), can lead to inaccurate pressure readings. Regular maintenance of the DPF can help prevent this.
- Less common but serious causes include a malfunctioning turbocharger, which can cause excessive pressure in the exhaust system, potentially leading to catastrophic engine failure.
- A rare cause could be a software issue within the ECM that misinterprets the data from the exhaust pressure sensor, leading to erroneous readings.
P0473 Repair Costs
Cost Breakdown by Repair Type
Exhaust Pressure Sensor Replacement
Replacing the faulty exhaust pressure sensor with a new OEM part.
- Total: $150 - $300
- Success rate: 90%
Wiring Repair
Repairing damaged wiring or connections related to the exhaust pressure sensor.
- Total: $100 - $200
- Success rate: 80%
DPF Cleaning
Cleaning or servicing the diesel particulate filter to remove blockages.
- Total: $200 - $500
- Success rate: 75%
Money-Saving Tips for P0473
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional P0473 Diagnosis Process
Follow these systematic steps to accurately diagnose P0473. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion around the exhaust pressure sensor (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion around the exhaust pressure sensor (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all diagnostic codes and freeze frame data to understand the fault context and gather additional information (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all diagnostic codes and freeze frame data to understand the fault context and gather additional information (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter to test the exhaust pressure sensor's voltage output against specifications, ensuring it responds correctly to pressure changes (20-30 minutes)
Step 3: Component testing - Use a multimeter to test the exhaust pressure sensor's voltage output against specifications, ensuring it responds correctly to pressure changes (20-30 minutes).
Step 4: Step 4: System function test - After any repairs, verify proper operation of the exhaust pressure sensor and clear the codes to reset the system (10-15 minutes)
Step 4: System function test - After any repairs, verify proper operation of the exhaust pressure sensor and clear the codes to reset the system (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to ensure that the issue is resolved and no new codes appear (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to ensure that the issue is resolved and no new codes appear (15-20 minutes).
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: 2015 Ford F-250 Exhaust Pressure Sensor Replacement
Vehicle: 2015 Ford F-250, 85,000 miles
Problem: Customer complained of poor acceleration and check engine light.
Diagnosis: Diagnostic scan revealed P0473; visual inspection showed a damaged exhaust pressure sensor.
Solution: Replaced the exhaust pressure sensor and cleared the codes.
Cost: $250 (sensor cost $150, labor $100)
Result: Vehicle performance improved significantly, and the check engine light remained off.
Case Study 2: 2006 Dodge Ram 2500 DPF Cleaning
Vehicle: 2006 Dodge Ram 2500, 120,000 miles
Problem: Customer reported reduced fuel economy and exhaust odor.
Diagnosis: P0473 code was confirmed; DPF was found to be heavily clogged.
Solution: Performed DPF cleaning and repaired wiring connections.
Cost: $400 (cleaning $250, wiring repair $150)
Result: Fuel efficiency improved, and the vehicle passed emissions testing.