P CODES (POWERTRAIN) P0400 - P0499

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...

Have Dtc Codes P0431/p0421. Put New "cat" And New 02 Sensors. Cleared Codes. Car Drove Fine Before And After New Parts Were Put On....

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...

P0441 Purge Incorrect Flow. I Checked The Purge Valve It Seems To Open And Closes. When The Purge Valve Is Purging The Fuel Tank Pressure...

What Causes Error Codes P0172 And P0401? What Is The Meaning Of Them And How To Fix Them?

The Upstream Sensor Is Steady, And The Downstream Is Fluctuating. Is That Considered A Bad Catalytic Converter?

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.