Your engine speaks in noises, and each type of sound points toward a different area. Learning to tell them apart helps you describe the problem and avoid an expensive misdiagnosis.
Ticking or tapping
A light tick that rises with engine speed often comes from the valvetrain, sometimes due to low oil or a worn lifter. Check the oil level first, since low oil is a common and cheap cause.
Knocking
A deep, rhythmic knock is more serious and can point to worn bearings or, on acceleration, to the wrong fuel or ignition timing. A persistent deep knock deserves quick attention.
Squealing
A high squeal, especially on start up or when you turn the wheel, usually means a slipping or worn serpentine belt. It is cheap to replace before it snaps.
Whining or humming
A whine that changes with engine or road speed can come from the power steering pump, a wheel bearing or the transmission. Note when it happens to narrow it down.
Frequently asked questions
Should I keep driving with a new engine noise?
A light tick that goes away after checking oil may be fine. A deep knock or grinding means stop and investigate.
Can low oil cause engine noise?
Yes, low or old oil is one of the most common causes of ticking. Check it first.
See our car accessory guides for diagnostic tools.
