P CODES (POWERTRAIN) P0400 - P0499

We Replaced The Rocker Arms And Lifters Changed Oil And Filter It Still Has Knock In The Top End But Drives Fine. The Codes That Come Up Are...

Thank You So Much For Replying To My Question, Your Site Is Great. Anyhow, I Was Told That Probably It Wasn't My O2 Sensor But A...

It Started Out With A Bad Gas Cap. Went To Auto Zone And They Sold Me The Wrong Cap That Wasnt Pressurized. I Drove For 3 Weeks Like That....

The Previous Owner Replaced The Catalytic Converter Last Year. What Can Cause A Catalytic Converter Below Threshold? I Checked The Voltage...

We Have Replaced Fuses Temperature Sensor And Fan It's Got A P0480 Code.

I'm Getting A P0441 Incorrect Purge Flow Code And I Was Wondering What Procedures I Could Take To Diagnose My Problem. Whenever I Get...

Got P0430 And P0420 Codes Show Up For Inefficient Cat. Replaced Post Cat O2 Sensors With No Luck; Check Engine Light Came Back. Took To A...

I Have Been Fighting A P0406, I Did Not Find Any Damage On The Wire Harness, And I Have Replaced Both The Erg Valve And Tube.

My Son Has The Vehicle Listed Above He Is Trying To Get Checked And Third Code Comes Up. Do You Have Any Diagrams On The Locations Of The...

My Car Listed Above Ls Model, Is Throwing Code P0420, Haven't Noticed Anything Acting Different. I'm Just Curious As To How I...