Does a cadalliac converter waste gas on 2005 Pontiac vibe?
A faulty catalytic converter on a 2005 Pontiac Vibe, or any car for that matter, can absolutely waste gas. A clogged or damaged catalytic converter restricts exhaust flow. This increased back pressure forces the engine to work harder, reducing fuel efficiency and potentially causing other issues like misfires or engine damage. So yes, it's a significant possibility.