P CODES (POWERTRAIN) P0400 - P0499

1996 Mercury Cougar 4.6 V8 110000 Miles. What Problem Might I Have After P0401 Code Came Up?

Engine Performance Problem 2002 Ford Escape 6 Cyl Four Wheel Drive Automatic The Catalytic Converter Got Bad. It Was Taken Off After...

I Had Random Misfire Code But I Fixed It By Replacing A Faulty Coil. I Have No Miss, But I Now Have A Po420 Code. Replaced Up And Down...

My Check Engine Light Came On With The Code Of Po420. Yesterday I Got The Flex Pipe, Extension Pipe, Resonator, Axle Pipe, Muffler And...

Check Engine Light Is On Engine Code Po420 Catalyst System Efficiency Below Threshold ( Bank 1) What Does This Mean?

Hi My Name Is Henry. Ok Ive Changed The Cat Converter About 2 Years Ago Bought Brand New From Dealer. About 60,000 Miles On Cat. And The...

I Have A 2003 Matrix That Is Showing The Check Engine Light; Code Check By Dealer [po420] Specifically Points To The Catalytic Converter [$...

Computer Problem 1997 Chevy Cavalier 4 Cyl Front Wheel Drive Manual Read The Codes On The Car Shows Code Po420 I Have Checked The Egr...

My Car Is Running A P0420 Code. My Exhaust Manifold Clearly Has A Crack Between The Manifold Gasket And The 1st O2 Sensor. Is It Possible...

A Couple Of Days Ago My Check Engine Light Came On. Plugged A Scanner In And Got P0420, But That Was It, No Other Info. Google Says...