Codes PO 115 and PO 400


Asked by Jan 11, 2014 at 03:55 PM about the 1999 Mazda Millenia 4 Dr STD Sedan

Question type: Maintenance & Repair

1 Answer


The P0400 has to do with a fault in the EGR (Exhaust Gas recirculation) system. The possible cause is leak or blockage, wiring, EGR Valve or EGR solenoid or the ECM. P0115 has to do with the ECT (Engine coolant sensor) possible causes for this fault is wiring or the Engine coolant sensor itself or the ECM

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