The bonnet's up and there it is: stripped insulation, bits of chewed plastic, maybe a nest. It's a sinking feeling. But what you do next makes a real difference, to your safety, to the repair bill, and to whether you're back here in a month. Do things in this order.
How urgent is it?
| What you see | What it means | Next step |
|---|---|---|
| Droppings or nesting material, no visible damage | Rats have been in; damage may be hidden | Clean safely, check carefully, start prevention |
| Chewed insulation, no bare copper | Early damage | Workshop visit soon; avoid long drives |
| Bare copper, cut wires, warning lights | Risk of short circuit and further damage | Don't start it; inspection or tow |
| Chewed fuel, brake or CNG lines, or a smell of fuel or gas | Safety risk | Don't start it; tow to a workshop |
1. Don't start the car yet
If you can see exposed copper or chewed wires, don't crank the engine. A shorted wire can damage electronics or, in the worst case, start a fire. A chewed sensor wire can also make the car run badly. If your car runs on CNG, check the gas lines too; our guide for CNG car owners explains what to look for.
2. Photograph everything
Before anyone touches it, take clear photos of the damage, any droppings and nesting material, and the dashboard if warning lights are on. Note the date and where the car was parked. You'll want this for the mechanic and for any insurance conversation.
3. Check your insurance
Coverage for rodent damage varies between insurers, policy types and add-ons. Call your insurer, describe the damage, and ask before you assume either way. Don't start repairs until you know whether they need to inspect it first. Our guide on whether car insurance covers rodent damage explains how policies usually treat it.
4. Get it inspected or towed
A mechanic needs to trace every chewed wire, because rats rarely stop at one. If the car can't be safely started, get it towed rather than risk it. Ask the workshop to check:
- The wiring harness along its full length, including sections under the cowl and near the firewall.
- Sensor connectors, which can be bitten without obvious damage nearby.
- Coolant, washer and vacuum hoses.
- The cabin air-filter housing and the air intake for nests.
What a proper repair looks like
Insulating tape over a bitten wire is a stopgap that can fail with heat and vibration. A proper repair joins each wire with a crimped or soldered connection sealed in heat-shrink, or replaces the damaged section of the harness. Ask for an itemised estimate that lists each wire and part, and ask to see the damaged parts if anything is replaced.
5. Clean out the nest safely
Wear gloves and a mask. Don't sweep or vacuum dry droppings: dampen them with disinfectant first, then wipe and bag everything. Replace the cabin air filter if rats have been near it. If there is a smell through the vents afterwards, see how to get rid of rat smell in a car.
6. Remove the scent trail
Rats follow urine trails back to places that worked for them. A thorough clean of the engine bay after the repair makes your car less likely to be revisited. Some workshops offer an engine-bay wash; ask them to keep water away from electrical connectors.
7. Set up prevention before you park again
The same car, in the same spot, will attract the same rats. Move the parking spot if you can, keep food out of the car, check under the bonnet weekly for the next month, and add a deterrent. Some owners also ask the workshop to wrap repaired sections in rodent-deterrent tape. The EchoRepel Car Rat Repellent runs while the car is parked, which is when they come back. For what the repair might cost, see the real cost of a rat in your car, and for a full comparison of prevention methods, see the best way to protect a car from rats.