NISSAN SENTRA P CODES (POWERTRAIN) P0400 - P0499

My Engine Light Is On. I Asked Autozone And The Did Zero It But It Is Back On Again. They Gave Me These 2 Codes After They Diagnozed It....

Hi, I've Been Having The Same Problem With This Car For Maybe A Few Weeks Now And Cant Figure Out What It Is. I Checked All The Vacumm...

Can Too Much Back Pressure Caused By A New Midpipe Cause A False P0420 Code?

I Checked The Car With Code Scanner With P0430 Catalyst System Efficiency Below Threshold Bank 2?Canyou Help Me To Find Out The Part That I...

On Code Po420 Cat. Converter, Does That Mean You Need To Replace Your Converter? Or Could Something Eles Be Wrong, I Hate To Spend Money On...