OBD codes / P0404
P0404
ModerateExhaust Gas Recirculation (EGR) Circuit Range/Performance
P0404 is generally safe to drive with short-term — mainly an emissions code, with possible rough idle or light pinging. It's low-risk mechanically. Try cleaning the EGR valve and checking the position sensor before replacing parts.
What this code means
P0404 means the EGR system's position feedback is out of its expected range — the valve isn't reporting that it moved to where the computer commanded. The common causes are carbon buildup jamming the valve so it sticks part-way, a faulty EGR position sensor, or a wiring/connector fault. It's a 'the valve isn't where it should be' code, so cleaning the carbon and verifying the position sensor are the usual first steps.
Symptoms you might notice
- Check-engine light, often with no obvious change
- Rough idle, hesitation, or light pinging under load
- Failed emissions test
What it costs to fix
Typical range: $100–$500 · about ~0.5–2.5 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| EGR clean (labor-only) | $0–$20 | ~1–2.5 hrs |
| EGR valve | $50–$300 | ~0.5–1.5 hrs |
| EGR position sensor | $25–$100 | ~0.3–1 hrs |
Cleaning the carbon that makes the valve stick is the cheap, common fix and may be labor-only. A new valve is modest; the position sensor cheaper. Cost climbs only if the EGR is buried in the intake.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0404 for my exact vehicle →
Frequently asked
Can I drive with P0404?
Usually yes, short-term — it's primarily an emissions code with possible rough idle. Address pinging sooner if you feel it, and fix it before an emissions test.
Will cleaning fix P0404?
Often — carbon making the EGR valve stick so it doesn't reach the commanded position is a common cause, and cleaning frequently restores proper travel. If it returns, the valve or position sensor may need replacing.
What does 'range/performance' mean for P0404?
The EGR valve isn't moving to (or reporting) the position the computer commanded — it's sticking or the feedback is off. That points to carbon, the valve, or the position sensor rather than a pure electrical fault.
How much does it cost to fix P0404?
Frequently inexpensive — a clean may be labor-only, and a valve or sensor is modest. Cost only rises if the EGR is buried in the intake and takes disassembly to reach.
Seeing P0404 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0404 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.