Question

2007 Chevrolet Impala LTZ 3.9L with engine codes P0442 and P0455

Answer 1

HI there,

This code means you have a small evep emissions leak. This can be as simple as a loose gas cap. I usually start there, then if the code comes back do a smoke test.

Answer 2

P0442 CHEVROLET Code - Evaporative Emission Control System Leak Detected Small Leak
Read more: https://www.autocodes.com/p0442_chevrolet.html

P0455 CHEVROLET Code - Evaporative Emission Control System Leak Detected Gross Leak
Read more: https://www.autocodes.com/p0455_chevrolet.html