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Hi. I have a problem with my 2010 2.4l lancer. I changed the complete pipe of the car but it has its original header and the check engine light turned on and the code p0420 comes out. I put new catalytic, the two new oxygen sensors and still it fails me. Symptoms are slow acceleration, when you stay at a speed it starts to go up and down in revolutions. What could it be?
 
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