Mechanical
LCA bush (Lower Control Arm)
A common front-suspension wear item that causes vibration and uneven tyre wear.
Worn lower control arm bushes feel like steering wander, clunks over bumps, and tyres that scrub the inside edge. Repair: $250–$650 per side depending on the platform. On a PPI we lever-test bushes and inspect for visible cracking and movement.
Related terms
Wheel alignment
Adjustment of camber/caster/toe to manufacturer spec — affects tyre life and handling.
DPF (Diesel Particulate Filter)
A soot trap in modern diesel exhausts that requires periodic high-speed driving to self-clean.
EGR (Exhaust Gas Recirculation)
An emissions valve that routes exhaust back into the intake — a notorious carbon-clog point on diesels.
Timing chain stretch
A common failure mode on VW/Audi 2.0 TFSI, Ford Ranger 3.2L and Nissan QR25 engines.
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