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Tengo un lancer 2002 con el codigo p0421 me esta dando problemas con el arranque se acelera y luego pierde poder y cuando esta detenido hace como si se fuera a apagar... he decidido cambiar toda la Tuberia del escape junto con el catalizador crees q resolveria mi problema al reemplazarlo todo?

Tambien tiene p0300 cambie las bujias y cables y sigue con el problema

P0134 y p0135 tambien detectors y sensores han sido cambiados
Vehicle: 2002 Mitsubishi lancer ls 2.0 lt

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As long as you have the misfire condition p0300 , You can expect all these code. This misfire may not even be caused by P0421. Unless the misfire is caused by the exhaust system you could resolve it

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