Toyota Aygo Mk1 1.0 — Severe Water Ingress into Boot and Cabin
The Mk1 Toyota Aygo (and its siblings the Peugeot 107 / Citroen C1) are infamous for leaking water like a sieve into the boot and rear footwells.
Severity
ModerateDIY Difficulty
Easy
Est. Cost
£10–£100
OBD Codes
None
Symptoms
- Spare wheel well fills up like a swimming pool
- Condensation on the inside of the windows in winter
- Damp, musty smell inside the car
- Wet rear seatbelts
Root Cause
Multiple poor seal designs from the factory. The high-level brake light seal fails, the rear vent flaps behind the bumper fail, and the rear door seals shrink.
How To Fix
- Remove rear bumper and seal the cabin vents with automotive silicone.
- Apply silicone sealant around the high-level brake light.
- Adjust the rear door striker plates to pull the doors tighter against the seals.
- Very cheap DIY fix, but annoying to trace all the leaks.
Estimated Repair Costs
| Repair Option | Est. Cost (GBP) |
|---|---|
| DIY (parts only) | £4–£40 |
| Independent Garage | £10–£100 |
| Main Dealership | £16–£160 |
Other Faults on This Variant
Air Conditioning Condenser Leak (Stone Damage)
MinorThe air conditioning condenser is mounted at the very front of the cooling pack, making it highly susceptible to stone damage from the road, leading to refrigerant loss.
Front Anti-Roll Bar Drop Link Wear
MinorThe front anti-roll bar drop links wear out on heavily potholed UK roads, causing an annoying knocking sound at low speeds.
Alternator / Smart Charge System Failure
SevereModern vehicles use smart charging systems to reduce engine load, but the complex regulators on the alternators frequently fail.
Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.