P CODES (POWERTRAIN) P1400 - P1499 P1475 Questions

At Start Up Car Runs Very Ruff . Smoother When Car Warms Up , I Took It To Auto Zone After Changing Spark Plugs And Diagnostics Machine Said...

Other Category Problem 2000 Bmw 740 V8 Front Wheel Drive Automatic 92k Miles Deq Gave Me This Reading For Free (p1475)! What Exactly...

I Know What The Code Says I Just Don't Know What To Look For Or What Part Of The Engine It's At. Thank You. Robert