P CODES (POWERTRAIN) P0400 - P0499 P0411

Secondary Air Injection Valve What Is The Problem Most Likely?

I Have Changed The Secondary Air Pump As The Code Says And I Still Get The Same Message. I Have Checked All Around For Leaks And Cannot Find...

I Have A 1999 Mustang 3.8l Engine. The Check Engine Light Went On. The Code Po411 Pulled Up. My Friend Looked At Engine, Can't Find The...

Hi There, I Have A E350, 7.5 Engine. The Codes P1443 And Po411 Keep Coming Up. I Have Looked Over All The Valves And Hoses, Repaired A...

Hi The Check Engine Light Had Been Flashing On My A4 2000 Audi And Engine Check Code That Came Out Was P0301 And P0411. Please Let Me...

Car Lags At Acceleration - But No Noises. Cel P0101 - Replaced Air Mass Flow Sensor. Found Crack In Intake Tube, Corrected, And Then Got...

The Check Engine Light Came On And The Error Code Read P0411. I Reset The Code And The Next Day The Error Code Was Back. The Car Runs Good...

Check Engine Light Is On. Scanned And Found P0411 Code. What Should I Do To Fix This?

My Check Engine Light Is On Code P0411, I Had The Car To 3 Different Mechanics Had The Vale Replaced, Had The Pump Replaced Everything Is...

2007 Hummer H-3 Code Issue Unable To Clear Code Po411 Reads Secondary Air Inadequate Upward Flow #1. Replaced Valve Then Reset Code Code...