Buy & sell

Red flags before you fall in love

Two checklists — Domestic US volume vehicles and European luxury — so the Cars floor covers both markets, not just Euro complexity.

Domestic US & trucks

  • Flood / water lines

    critical

    Check carpets, spare well, seat tracks, and under dash for silt. Trucks used in storms are high risk.

  • Transmission slip or delayed engagement

    critical

    Test cold and hot. Rebuilds on late-model automatics are four-figure events.

  • Frame / brake line rust (salt belt)

    critical

    Lift inspection for frame scale, fuel/brake lines, and bed mounts on older trucks.

  • Security light / multiple keys missing

    high

    Missing keys on PATS/Passlock-class vehicles can mean expensive programming or prior theft recovery issues.

  • Hacky remote start / stereo / trailer wiring

    high

    Look under dash and at battery for poor grounds and tapped circuits — #1 parasitic source.

  • 4×4 bind, clunk, or inoperative

    high

    Cycle 2H/4H/4L on safe surface. Encoder motor and transfer case repairs add up.

  • Oil consumption / tick on known engines

    watch

    Research engine family TSBs. Ask for oil-change interval proof.

  • Airbag or ABS light on

    high

    Budget scan + clock-spring / sensor work. Do not assume “just a sensor.”

  • Thin service history on high-mile trucks

    watch

    Timing chains, spark plugs on DI engines, and transmission service intervals matter.

European luxury

  • No coding / programming notes after modules

    high

    Battery, modules, or keys without shop documentation is a red flag for future no-starts.

  • Cowl / sunroof drain water ingress

    critical

    Corroded connectors under carpets and in module cavities are classic Euro gremlins.

  • Wrong battery type or no registration

    high

    AGM skipped or flooded installed where AGM required — chronic charging faults.

  • Recent glass without calibration proof

    high

    Lane keep / ACC warnings after windshield work need paid calibration.

  • Only one key on complex immobilizer

    watch

    Spare key programming can be dealer-only and expensive.

  • No nearby independent with OEM-class tools

    watch

    Ownership cost explodes if every job is dealer-only.

PPI tip

A pre-purchase inspection with a shop that owns a capable scan tool beats a free “code pull” at a parts store. Budget the inspection — it is cheaper than a surprise transmission or coding nightmare.