Honda CR-V: Rear Sill, Inner Wheel Arch and Floor Pan Rust — RD / RE Generations

RD4 and RE-generation CR-Vs — especially JDM imports — develop rust at the rear sill/rocker seam, inner wheel arch lip, and floor pan above the rear beam mounts. Australia's coastal humidity and road salt in southern regions accelerate perforation. The inner sill seam is particularly vulnerable as factory underbody protection thins in that area. Serious corrosion can compromise structural integrity at roadworthy and reduce crash protection.

• Paint bubbling or lifting on the lower rear sill or rocker panel
• Visible rust scaling inside the rear wheel arch lip
• Soft, perforated, or flexible floor pan when pressed near rear seat
• Musty smell inside cabin from moisture ingress through rusted floor
• Rust visible in the spare wheel well

1. 1

   Inspect the rear rocker panels at both ends, inner arch seams, and the spare wheel well floor for perforations.

2. 2

   Lift the boot floor mat and press the floor pan firmly.

3. 3

   Check the rear beam mounting points on the underside with a torch.

Parts involved: Body corrosion.

≈A$640 to ≈A$3,500 at independent workshop rates, shown as an approximate guide in Australian dollars. That is for this job on its own, not for the car.

An estimate, converted to Australian dollars, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Has the car lived near the coast or in a high-rainfall region?”
• “Has any rust treatment or panel repair been carried out?”
• “When was the underside last inspected?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.