https://www.youtube.com/watch?v=jRmTrlfI8js
P0401 2000 TOYOTA CAMRY Possible Causes
- EGR passage clogged
- Faulty EGR Vacuum Modulator Valve
- Faulty EGR Valve
- Faulty EGR solenoid valve
- EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- Dead (Weak) battery
- Faulty EGR temperature sensor and circuit
- Exhaust gas leaks
- Manifold absolute pressure sensor