P0474 — Exhaust Pressure Sensor High
Drive with caution — fix soon.
What P0474 means
This code means the engine computer is reading an abnormally high signal from the exhaust pressure sensor. It usually points to a short to voltage in the wiring, a faulty sensor, or a genuine exhaust restriction such as a clogged particulate filter creating excess backpressure. It's a moderate code tied to emissions and drivability and is typically fixable with sensor, wiring, or exhaust repair.
Common symptoms
- Check engine light is on
- Reduced engine power or limp mode
- Rough idle or struggling under load
- Excessive exhaust smoke (especially on diesels)
- Drop in fuel economy
Common causes
- Faulty exhaust pressure sensor
- Short to voltage in the sensor circuit
- Clogged particulate filter or exhaust restriction
- Blocked or carbon-clogged sensor tubes
- Damaged wiring or corroded connector
Typical repair cost
$150 – $500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0474 code?
For short trips usually yes, but be cautious. A high reading can mean a real exhaust blockage, which stresses the engine, so get it checked within a few days rather than ignoring it.
How much does it cost to fix a P0474 code?
Repairs typically run $150 to $500. Replacing the sensor or fixing wiring is on the lower end, but clearing or replacing a clogged particulate filter can push the cost well higher.
Is a P0474 code serious?
It's moderate, but a bit more concerning if the high reading reflects a real exhaust restriction. That excess backpressure can hurt performance and engine health, so don't let it go unaddressed.
Could a P0474 mean my exhaust is blocked?
Yes, a high exhaust pressure reading can indicate a genuine restriction, like a clogged particulate filter or crushed pipe. A mechanic will confirm whether it's a real blockage or just a sensor or wiring fault.