Suspension Spring — OEM 3C0511115AE

OEM reference 3C0511115AE is a catalogue route for a particular rear coil-spring specification. The AE suffix is part of the identity, not a cosmetic ending, and it must not be exchanged for AF or another revision without authoritative application or supersession evidence. Confirm the VIN, production date, rear axle-load class, body and suspension option, then compare the full number and identification marks on the fitted springs where they remain legible.

Candidate products currently grouped here include rear-axle coil springs described as variable- or inconstant-wire designs. That construction can alter rate through the suspension travel and can make coil spacing or wire section look unusual when unloaded. Catalogue association does not guarantee fitment: free length, wire profile, mean coil diameter, end shape, seat orientation, left/right designation and load calibration all need to match the exact vehicle.

A coil spring supports the vehicle's sprung mass and stores energy as the wheel rises. The damper controls the speed of this movement but does not normally establish static ride height. An incorrect, weakened or fractured rear spring can reduce bump travel, alter wheel alignment and braking balance, overload the damper or allow a sharp broken end to threaten a tyre, brake hose or sensor lead.

Inspect both rear springs in clean, well-lit conditions, especially their lowest turns and the faces hidden by rubber pads. Warning signs include an uneven stance, metallic knock, frequent bottoming, changed headlamp attitude, fresh tyre contact, deep corrosion or a missing coil end. Vehicle load and tyre pressures must be equalised before comparing height. Springs on one axle should normally be renewed as a matched pair.

Compressed suspension springs store dangerous energy. Use the vehicle-specific dismantling procedure and the correct support or compressor; never heat, cut, weld or improvise restraint. Examine seats, isolators, dampers, bump stops and mounting hardware during the repair, torque fixings as specified and check final ride height and alignment. Treat 3C0511115AE as one precise identification clue within that complete process.