Start the engine and listen for ticking, tapping, or puffing sounds near the exhaust manifold, gaskets, and pipes
Check for visible soot or black carbon marks around exhaust joints, flanges, manifold, and tailpipe connections
Look for a strong exhaust smell in or around the engine bay, under the vehicle, or inside the cabin
Inspect for cracked, rusted, or loose exhaust components
Feel for escaping gases near suspected joints only when the engine is cold and using caution
Use a smoke test to reveal leaks in the exhaust system
Spray soapy water on suspected joints and watch for bubbling while the engine is running
Check for rattling or hissing noises that change with engine speed
Inspect the cabin for symptoms like headaches, dizziness, or fumes, which may indicate an exhaust leak
Examine the exhaust manifold gasket and flex pipe for common leak points
Use a mechanic’s stethoscope or a length of hose to pinpoint the leak source
Scan for trouble codes or abnormal oxygen sensor readings that may suggest an exhaust leak
Check for heat discoloration or warped parts near the leak area