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Read moreWhy Is My Car Making a Knocking Sound?
A knocking sound coming from your car is never something to ignore. Whether it’s faint or loud, constant or occasional, knocking noises usually point to a mechanical issue that can worsen quickly if left unchecked.
If your car has started making a knocking sound, here are the most common causes — and when it’s time to book it in with J & K's Mechanical.
Common Causes of Knocking Sounds in Cars
Engine Knocking (Detonation or Pre-Ignition)
Engine knocking often sounds like a metallic pinging or tapping coming from the engine bay, especially when accelerating.
Common causes include:
- Incorrect fuel type
- Carbon build-up in the engine
- Faulty spark plugs
- Engine timing issues
- Low-quality fuel
Left unresolved, engine knock can cause serious internal engine damage.
Low Engine Oil or Oil Pressure
If your engine oil is low or old, moving components may not be properly lubricated, causing a knocking or tapping noise.
Warning signs:
- Knocking gets louder as revs increase
- Oil warning light is on
- Engine feels rough or sluggish
Regular servicing helps prevent this type of damage entirely.
Worn Suspension Components
A knocking noise over bumps or when turning is often related to suspension issues.
Possible culprits include:
- Worn shock absorbers
- Loose or damaged sway bar links
- Ball joints or control arm bushes
Ignoring suspension knocks can affect handling, braking, and tyre wear.
Exhaust System Issues
A loose or damaged exhaust can cause a knocking or rattling sound, especially when driving over rough roads or during cold starts.
Common exhaust problems:
- Loose heat shields
- Broken exhaust mounts
- Cracked pipes
These issues are usually inexpensive to fix if caught early.
Worn CV Joints or Driveshafts
If you hear a knocking or clicking noise while turning, particularly at low speeds, worn CV joints could be the cause.
Symptoms include:
- Knocking when steering left or right
- Grease visible around the wheels
- Vibration while driving
CV joint failure can eventually leave you stranded.
Brake-Related Knocking Noises
Knocking sounds from the wheels can sometimes be caused by brake issues.
This may happen if:
- Brake pads are worn or loose
- Anti-rattle clips are missing
- Calipers are sticking
Brake noises should always be checked promptly for safety reasons.
Is It Safe to Drive With a Knocking Sound?
In most cases, no. Some knocks may seem minor, but many indicate wear or damage that can escalate quickly — leading to breakdowns, expensive repairs, or safety risks.
If the knocking:
- Is getting louder
- Happens constantly
- Appears during acceleration, braking, or turning
It’s time to have it inspected by a professional.
How J & K's Mechanical Can Help
At J & K's Mechanical, we use professional diagnostic equipment and hands-on expertise to quickly identify the source of knocking noises — saving you time, money, and unnecessary repairs.
We inspect:
- Engine and lubrication systems
- Suspension and steering components
- Brakes and driveline
- Exhaust mounts and fittings
Once we’ve identified the issue, we’ll clearly explain what’s wrong and what needs to be done — no surprises.
Book an Inspection Today
If your car is making a knocking sound, don’t wait for it to turn into a major repair. Book online or speak with our friendly staff to book an inspection and drive with confidence knowing your vehicle is safe and reliable.
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