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do i need to replace both the egr and the map or can i just replace one and it will fix both codes?

Vehicle: 1997, nissan, hard body, 2.4

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P0402 Exhaust gas recirculation flow excesive

P1105 MAP / BARO switch solenoid valve

P1105 is for the MAP / BARO solenoid valve.when this code condition occurs it mostly due to a shorted or open circuit of the MAP /BARO solenoid valve. So you may have to do both.

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