P0407 — Exhaust Gas Recirculation Sensor A Circuit High
Drive with caution — fix soon.
What P0407 means
This code means the engine computer is seeing too high a voltage signal from the 'A' EGR position sensor, which tracks how the exhaust gas recirculation valve is moving. It usually points to a wiring problem, a bad sensor, or a faulty EGR valve. It's a fairly common code and is often fixable without major engine work.
Common symptoms
- Check engine light is on
- Rough idle or slight engine shaking
- Reduced engine power or hesitation
- Slightly worse fuel economy
- May fail an emissions test
Common causes
- Faulty EGR position sensor
- Damaged or corroded wiring or connector at the EGR sensor
- Short to voltage in the sensor circuit
- Failing or stuck EGR valve
- Poor ground or power supply to the sensor
Typical repair cost
$150 – $450
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0407 code?
For short trips, usually yes, since it's mostly an emissions and sensor problem and won't typically leave you stuck. Still, you shouldn't rely on it long-term, as a faulty EGR system can hurt fuel economy and cause it to fail emissions testing. Get it diagnosed soon.
How much does it cost to fix a P0407?
Most repairs land between about $150 and $450. If it's just wiring or a connector, it's on the lower end; replacing the EGR position sensor or the valve itself pushes it higher.
Is a P0407 code serious?
It's not an emergency and rarely leaves you stranded, but it shouldn't be ignored. Left alone it can worsen fuel economy, affect performance, and cause a failed emissions test.
What does the 'A' sensor circuit high mean in P0407?
It means the EGR position sensor 'A' is sending a voltage signal that's higher than expected, which usually points to a wiring short to voltage, a bad sensor, or a faulty connector rather than the engine itself being damaged.