This tool provides general guidance — not professional mechanical advice. Always have a qualified mechanic inspect your vehicle before making any repair decisions.
#1 Most Likely
Rattling under car
Typical Cost
$100 – $400
Heat shield replacement typically costs $100–$300 per industry repair data (2024). Exhaust clamp or hanger repair is commonly $50–$150. If the muffler or mid-pipe requires replacement, costs may be higher. Prices vary by vehicle make and region.
- Loose heat shield
- Failed exhaust hanger or clamp
- Loose catalytic converter shield
- Worn exhaust muffler
A rattling noise from underneath the vehicle may indicate a loose or damaged exhaust component, heat shield, or suspension part. In most cases, loose heat shields are the culprit — a harmless but annoying condition. In less common cases, it may indicate a loose catalytic converter or failing exhaust clamp.
What a mechanic will check
A mechanic will likely inspect the exhaust system from the manifold to the muffler, check heat shield mounting points, and look for loose hangers or clamps. They may gently push on components while the car is on a lift to find the source.
What to say to your mechanic
“I hear a rattling noise from under my car, especially at idle or low speed. Can you put it on a lift and check the exhaust system and heat shields? I want to understand what may be causing it.”
Script based on industry repair procedures