How to Get Rid of a Marten in Your Car and Protect the Engine
updated 11 July 2026
Quick answer
Martens attack cars because they smell a rival in the warm engine bay and want to destroy its scent marks. A combination of methods works best: a thorough engine bay wash (removes the scent), an electronic repellent or a mat under the car, and hard guards on the cables. On top of that, vary where you park, and after a stop in the countryside or near a forest, check under the hood for paw prints.
Step by step
- 1
Confirm it is a marten
Before you act, make sure what you are dealing with. Telltale signs are muddy paw prints on the engine cover and battery, chewed wires and rubber hoses, shredded insulation, and a torn soundproofing mat. Warning lights may come on in the dashboard, usually from damaged sensors, ignition leads, or fluid lines. Sometimes you will also find food scraps or feathers carried under the hood.
- 2
Wash the engine bay thoroughly
This is the most important step, and one many drivers forget. A marten bites aggressively when it smells another marten on its territory. A professional engine bay wash removes those scent markers and takes away the animal's reason to attack. Do it especially when you park in a new spot or when the car stood somewhere another marten may have been prowling.
- 3
Install a repellent in the engine bay
Car parts stores sell two kinds of devices. Ultrasonic repellents emit a sound martens find unpleasant, while high-voltage models work like an electric fence, giving the animal a harmless but off-putting jolt when it touches the metal plates. They are mounted permanently under the hood and powered from the battery. This is one of the more effective options against repeat visits.
- 4
Put a mat or fence under the car
Martens dislike walking on unstable, prickly ground. A special spiked mat (sometimes called a hedgehog mat) spread under the parked car discourages the animal from going underneath. Low fencing or mesh blocking access to the space under the car works in a similar way. It is a good barrier if you always park in the same spot.
- 5
Fit guards on cables and hoses
If the marten keeps coming back, protect what is most at risk. Hard plastic sleeves and corrugated conduit slipped over cable harnesses and hoses make them hard to bite through. Focus on the lines the animal has already gnawed, because martens often return to the same spot. Guards do not scare it off, but they limit the damage when other methods fail.
- 6
Change your parking habits
Wherever possible, keep the car in a closed garage - that is the most reliable barrier. If you park outside, try switching spots from time to time, because martens are territorial and get attached to a specific car in their area. Avoid parking right next to bushes, wood piles, and outbuildings, which are natural hideouts for them.
- 7
Check the car after parking near villages or forests
After a night in a rural yard, at a forest parking lot, or at your allotment, look under the hood before you drive off. A quick scan of the engine bay for paw prints and bite marks catches damage before it grows. Pay attention to the cooling system hoses and wiring, because a bitten-through hose can leave you stranded mid-trip.
Why martens chew car cables
Territorial behavior is behind most attacks. The stone marten marks its turf with scent. When you park a car that another marten has visited, the resident smells the intruder under the hood and turns aggressive, chewing cables and hoses to destroy the rival's markers. That is why the damage is often sudden and extensive.
The second reason is warmth and shelter. A warm engine holds its heat for a long time, and the dense tangle of wiring makes a cozy, sheltered spot. Young, teething martens also chew everything out of curiosity, much like puppies, and the rubber and soft plastics of car lines are convenient to gnaw on.
How to protect your car from martens long term
Combining methods works far better than relying on just one. A repellent alone may not be enough if the rival's scent still lingers in the engine bay, and a mat alone will not help if the marten climbs in from another side. The combination of a washed engine bay, a repellent, and cable guards performs best.
Remember too that martens are wild animals. Instead of trying to trap or harm the animal, rely on deterrents and physical barriers. That approach works better in the long run, because it does not create a vacancy that the next marten, drawn by the same warm engine, will quickly fill.
Frequently asked questions
›What should I do if a marten is in my car?
If you suspect a marten is sitting under the hood, open it and make some noise - the animal usually flees on its own. Then wash the engine bay thoroughly to remove the scent, and check that it has not chewed through any cables or hoses before you set off.
›How do I protect my car from martens?
Combine methods: wash the scent out of the engine bay, install an ultrasonic or high-voltage repellent, fit guards on the cables, and put a mat under the car. If you have a garage, park the car there, because it is the most reliable barrier.
›Do ultrasonic marten repellents work?
They can help, but they are rarely enough on their own. The best results come from combining a repellent with an engine bay wash and cable guards. High-voltage devices of the electric fence type tend to be more effective than ultrasound alone.
›How do I know a marten chewed my cables?
The giveaways are muddy paw prints in the engine bay plus shredded insulation and rubber hoses with visible teeth marks. Dashboard warning lights also often come on because of damaged wires or sensors.
›Why did a marten pick my car?
Most often because another marten prowled it earlier and left its scent, or because you park inside its territory close to hideouts. The warm engine and the sheltered space under the hood only add to the appeal.