exhaust rattle · metal rattling under car
A metallic rattling or buzzing noise from underneath the car, often changing with engine RPM or road vibration.
A quick visual inspection underneath, or a workshop lift check, usually spots a loose heat shield immediately - it is a very common, low-cost fix.
Usually safe to drive - this is more of an annoyance than a safety issue, though it is worth fixing before the shield or bracket falls off entirely.
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Descriptions are for guidance only and do not replace a workshop inspection. If you are ever unsure whether it is safe to keep driving, pull over in a safe spot.
Thick white smoke from the exhaust
SeriousThick, persistent white smoke (often with a sweet smell) coming from the exhaust, especially if it does not go away as the engine warms up.
Blue smoke from the exhaust
WarningA bluish or blue-gray tinted smoke from the exhaust, often accompanied by a burning oil smell.
Black smoke from the exhaust
InfoDark black or sooty smoke coming from the exhaust, usually noticeable when accelerating.
Backfiring or popping sounds from the exhaust
WarningLoud popping or banging sounds from the exhaust, often when letting off the gas or during deceleration, sometimes with a visible flash.
