Exhaust Pressure Sensor Circuit High
The P0473 code means the vehicle's onboard diagnostic system has detected: Exhaust Pressure Sensor Circuit High. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $80 - $400 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light on
- Incorrect exhaust pressure readings
- DPF regeneration problems
- Possible limp mode
Probable Causes (Ranked by Likelihood)
- Open circuit in exhaust pressure sensor wiring Very High
- Failed sensor (open) High
- Disconnected sensor connector Moderate
- Short to reference voltage Low
Step-by-Step Diagnostic Procedure
-
Read sensor voltage. Above maximum at KOEO confirms high/open circuit.
-
Check connector is fully seated.
-
Test wiring continuity.
-
Replace sensor if open.
Frequently Asked Questions
What causes circuit high on the exhaust pressure sensor?
An open wire or disconnected sensor prevents a signal from reaching the PCM, causing a high voltage reading.
Can the sensor connector melt from exhaust heat?
In severe cases yes. If the connector is too close to the exhaust system, heat can damage or melt it over time.
How much is the exhaust pressure sensor?
The sensor costs $30-$100. The pressure hose is $15-$40. Labor is typically $50-$150.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0473 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.