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ProblemsByVin Checklist / 2021-FORD-F-150

Pre-purchase · Buyer's checklist

2021 Ford F-150 inspection checklist

The 2021 Ford F-150 has 917 owner complaints with NHTSA across 6 component categories. Use this checklist before you put money down — every item below is grounded in the actual failure pattern on this vehicle, not generic advice.

1 Inspect the powertrain

What to look for: Hesitation on takeoff, harsh or delayed shifts, vibration at highway speed, fluid leaks on the driveway under the engine bay or transmission pan. (264 owner complaints on this vehicle · typical repair $2,500 · failures cluster ~57,853 mi)

Transmission fluid color and smell — fresh ATF is red, brown or burnt smell is bad
Engine and transmission mounts (cracks or visible sag)
CV boots front (and rear on AWD) — any tears mean a $300–$800 axle replacement
Driveshaft U-joints and rear differential fluid level on RWD/AWD

On the test drive: Drive 15+ minutes including a freeway on-ramp at full throttle, a steep hill, and stop-and-go traffic. Listen for clunks on shifts, flares between gears, and shudders during light acceleration at 30–50 mph (torque converter symptom).

See full powertrain report for this vehicle →

2 Inspect the visibility

What to look for: Wiper streaks even on a fresh blade, blower fan that doesn't change speeds, foggy or yellowed headlight lenses, sunroof drains plugged (water on headliner). (112 owner complaints on this vehicle · typical repair $350 · failures cluster ~39,456 mi)

All wiper speeds front and rear (if equipped) plus washer fluid spray pattern
Defroster — front and rear, every grid line working on the rear glass
HVAC fan on every setting, plus mode (vent, floor, defrost) selector
Sunroof open/close and tilt — check for grinding noises

See full visibility report for this vehicle →

3 Inspect the electrical

What to look for: Dim or flickering dash lights at idle, slow window operation, intermittent infotainment glitches, parasitic battery drain (dead battery after a few days parked). (102 owner complaints on this vehicle · typical repair $850 · failures cluster ~38,112 mi)

Battery age sticker — most batteries last 3–5 years
Alternator output at idle (13.8–14.5V is healthy)
All exterior lights: headlights both beams, taillights, brake lights, reverse, blinkers
Every interior switch: power windows, locks, mirrors, sunroof, seats
Infotainment cold-start time and touchscreen responsiveness

On the test drive: Cycle through every electronic accessory during the drive — heated seats, defrosters, climate fan on max, cruise control. Glitches show up under load.

See full electrical report for this vehicle →

4 Inspect the lighting

What to look for: Headlight lens haze that'll need restoration, dim low beams, condensation inside the housings, blinkers flashing fast (bulb out). (80 owner complaints on this vehicle · typical repair $250 · failures cluster ~60,840 mi)

Every exterior light — walk around with a helper pressing the brake, blinkers, hazards
Headlight aim — should not blind oncoming traffic; misaligned often after collision
Interior dome lights, glove box, vanity mirror lights, trunk light

See full lighting report for this vehicle →

5 Inspect the engine

What to look for: Blue smoke on cold start (oil burning), white smoke at temperature (coolant), knock or tick that doesn't go away after warm-up, oil spots under the vehicle. (57 owner complaints on this vehicle · typical repair $3,100 · failures cluster ~35,724 mi)

Oil dipstick — level on the full mark, color amber not black, no milky residue (head gasket sign)
Coolant reservoir — level, no oil film floating, no rust
Spark plug wells (look down with a flashlight) — oil pooled means valve cover gasket
Timing chain or belt service history (interference engines = $1,500+ if it breaks)
Exhaust smoke briefly after a long idle then a rev

On the test drive: Drive until the gauge reaches operating temp, then check temp stability under load on a hill. Surging or temp climbing under load = thermostat or water pump.

See full engine report for this vehicle →

6 Inspect the brakes

What to look for: Pulsing brake pedal, pulling to one side when braking, squealing or grinding, soft pedal that goes to the floor. (42 owner complaints on this vehicle · typical repair $450 · failures cluster ~34,390 mi)

Brake pad thickness (look through the wheel spokes — at least 4mm material)
Rotor surface — deep grooves or lip on the outer edge means resurface or replace
Brake fluid color in the reservoir — should be light amber, not dark brown
ABS warning light cycles off after start

On the test drive: Hard brake from 40 mph in a safe spot — pedal should be firm, stop should be straight. A pulse means warped rotors ($300–$600).

See full brakes report for this vehicle →

7 Paperwork — before you sign

The seller's transparency on these tells you what kind of seller you're dealing with.

Title in seller's name (not "open title" or "signed by previous owner")
Service records — at least the last 24 months
VIN on the dash matches the door jamb sticker and the title
Run a paid vehicle history report (Carfax or AutoCheck) — accident, salvage, odometer rollback
Confirm any open recalls have been completed (NHTSA VIN lookup)
If financing, get the rate in writing before you set foot on the lot

Inspection items derived from 917 owner complaints and 12 active recall campaigns filed with NHTSA on the 2021 Ford F-150. Category-specific guidance is written by ProblemsByVin contributors with ASE-certified mechanic review. This checklist is meant to surface known patterns — it doesn't replace a paid pre-purchase inspection by a qualified shop, which we recommend for any used vehicle priced over a few thousand dollars.

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