Exhaust Pressure Sensor High Input
The exhaust pressure sensor signal is higher than expected.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The exhaust pressure sensor is detecting too much pressure in the exhaust system, indicating a potential blockage or sensor issue.
What the computer is actually seeing
The engine control module (ECM) expects the exhaust pressure to be within a specific range (typically between 0.5V and 4.5V). If the voltage exceeds the upper threshold (usually around 4.5V), it triggers the P0473 code.
What a healthy reading looks like
The voltage from the exhaust pressure sensor should typically range between 0.5V (minimal exhaust back pressure) and 4.5V (maximum expected pressure).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the exhaust system for visible blockages or damage.
- 22. Check the wiring and connectors to the exhaust pressure sensor for corrosion or loose connections. Repair if found.
- 33. Measure the voltage at the exhaust pressure sensor connector while the engine is at idle and under load. Expected should be between 0.5V and 4.5V.
- 44. If voltage is outside spec, replace the exhaust pressure sensor.
- 55. If voltage is normal, perform a back pressure test on the exhaust system to check for blockages.
Common causes
- Blocked exhaust system (catalytic converter or DPF saturation)
- Faulty exhaust pressure sensor
- Wiring or connector issues leading to short circuits
- Engine tuning issues affecting exhaust back pressure
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately severe; you can drive it, but it may affect performance and emissions. Get it diagnosed soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, the code will likely return after clearing.
Why do I see this code with a high EGT (exhaust gas temperature) code?
Excess exhaust pressure can increase EGT, indicating potential restrictions or sensor failures.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →