3.6 V6 timing chain stretch on high-mileage cars
Inspect · Listen for a rattle on cold start and check for engine light

What the known faults on this Chevrolet Impala typically cost to put right at a UK independent garage · use the figures to price risk before you bid, and to justify a reduction when something shows up on inspection.
The single priciest documented job on the 2014–2020 Chevrolet Impala is timing chain, tensioner & guides at £900–£2,400. Few cars need every repair listed here · treat £1,950–£7,400 as the full exposure if one arrived with all of them.
3.6 V6 timing chain stretch on high-mileage cars
Inspect · Listen for a rattle on cold start and check for engine light
Electric power steering warning and heavy steering
Inspect · Check for a steering warning on the dash
MyLink infotainment screen freezing and camera faults
Inspect · Test the screen and backup camera
Water leaks into the trunk from rear light seals
Inspect · Check the trunk floor for damp
Front brake vibration from warped rotors
Inspect · Brake firmly from highway speed
Six-speed automatic harsh shifting and shudder
Inspect · Feel for clunks and shudder between gears
Ranges are indicative parts-and-labour costs at a UK independent garage, inclusive of VAT. Franchised dealers typically sit 40–80% higher, and prestige or electrified variants sit at the top of each band. Always get a written quote before committing.
Build a tickable checklist for the exact car in front of you, record faults with photos, and hand the buyer a report.