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My 4 cyl 2002 Toyota Highlander check engine light keeps coming on. The code is a PO402. My husband says it's just the oxygen sensor but I'm concerned it could be something more serious that could effect the engine performance. Can you give me advice?

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P0402 Exhaust gas recirculation flow excessive detected

 P0402 Excessive EGR flow will surely cause rough idle and may be a stall at idle, yes this does affect engine perfromance

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