P0473 — Exhaust Pressure Sensor Low
Drive with caution — fix soon.
What P0473 means
This code means the engine computer is reading an abnormally low voltage or pressure signal from the exhaust pressure sensor. It usually points to a short to ground in the wiring, a failed sensor, disconnected or clogged sensor tubes, or a poor connector. It's a moderate code related to emissions and drivability and is normally fixable with sensor or wiring repair.
Common symptoms
- Check engine light is on
- Reduced engine power or limp mode
- Rough idle or hesitation
- Increased exhaust smoke (especially on diesels)
- Slightly lower fuel economy
Common causes
- Faulty exhaust pressure sensor
- Short to ground in the sensor circuit
- Disconnected or clogged sensor pressure tubes
- Corroded or loose electrical connector
- Damaged wiring harness
Typical repair cost
$150 – $450
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0473 code?
Usually yes for short trips, but don't delay. A low sensor signal can affect EGR and emissions and may cause reduced power, so have it checked within a few days.
How much does it cost to fix a P0473 code?
Most repairs land between $150 and $450. Replacing the sensor or fixing a connector is cheaper, while tracing a wiring short to ground or cleaning sensor tubes adds labor.
Is a P0473 code serious?
It's moderate. The car usually stays drivable, but the fault impacts emissions and can reduce performance, and on diesels it relates to the particulate filter, so it's worth fixing promptly.
What causes a low exhaust pressure sensor signal?
Common causes are a short to ground in the wiring, a failed sensor, or disconnected sensor tubes. The low reading tells the computer the sensor or its circuit isn't reporting realistic exhaust pressure.