A tick that fades as the engine warms. A cracked manifold or a failed gasket. Can leak fumes.
A cracked exhaust manifold or failed gasket sealing as it expands with heat.
Fumes can reach the cabin. If you smell exhaust inside, treat it as urgent.
Reading about sounds only goes so far. The tuner on our home page listens in your browser and tells you what it hears. The app goes further: it names the exact fault, checks it against your vehicle, and tells you how urgent it is.