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Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 6945
Experience:  Mitsubishi employed and Factory trained ASE certified technician
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Mitsubishi: I have a Mitsubishi Montero Sport 2001 3.0, I have

Customer Question

I have a Mitsubishi Montero Sport 2001 3.0, I have p0401 after a tuneup. Went back through can't find what i did wrong? Checked the EGR Valve doesn't seems good but it does have poor Vacuum
Submitted: 2 years ago.
Category: Mitsubishi
Expert:  Greg replied 2 years ago.
Check the following possibility's Faulty EGR Valve Faulty EGR solenoid valve Faulty EGR Vacuum Modulator Valve EGR solenoid valve circuit poor electrical connection Dead (Weak) battery Faulty EGR temperature sensor and circuit Exhaust gas leaks EGR passage clogged EGR solenoid valve harness is open or shorted If the code is cleared and comes back with out starting the engine then check the wiring harness and connections to the EGR solenoid ..If the code only comes back after a test drive check the vacuum lines .