Comprehensive pre-purchase inspection of a 2021-2024 Ford F-150 with 3.5L EcoBoost V6 engine to assess overall vehicle condition, identify potential issues, and verify proper operation of major systems.

Warnings

Tools required

Preparation

1. Verify vehicle identification number (VIN) matches documentation and run vehicle history report
2. Park vehicle on level, paved surface with adequate lighting
3. Set parking brake and place transmission in Park
4. Have owner/seller provide all keys, service records, and manuals for review
5. Perform initial visual walk-around noting obvious body damage, mismatched paint, tire condition, and fluid leaks on ground

Procedure

1. 1

   Exterior and body inspection
   Inspect all body panels for damage, rust, and paint condition. Use paint depth gauge if available to check for previous bodywork (readings should be consistent, typically 80-150 microns from factory). Check panel gaps and alignment. Inspect bed for damage, rust, and proper liner installation. Check all glass for cracks or chips. Verify all exterior lights function properly including headlights (both low and high beam), taillights, brake lights, turn signals, and hazard lights. Inspect windshield wiper blades for wear.
2. 2

   Tire and wheel inspection
   Check tire tread depth on all four tires (minimum 4/32 inch, preferably 6/32 inch or more). Look for uneven wear patterns indicating alignment, suspension, or inflation issues. Verify tire age from DOT code (avoid tires over 6 years old). Check tire pressure against door jamb sticker specification. Inspect wheels for curb rash, bends, or cracks. Check wheel lug nuts for proper seating and signs of impact wrench damage. Verify all center caps and TPMS sensors present.
3. 3

   Underbody and suspension inspection (front)
   Raise front of vehicle with floor jack at designated front jacking point and support on jack stands at frame rails. Inspect frame for damage, rust, or previous repair. Check engine oil pan, transmission pan, and front differential (if 4WD) for leaks or damage. Inspect CV axles or driveshaft for tears in boots or leaking grease. Check all suspension components including control arms, ball joints, tie rod ends, and sway bar links for wear, damage, or excessive play. Inspect brake lines and hoses for rust, damage, or fluid leaks. Look for fluid leaks from steering rack, transmission, and transfer case.
4. 4

   Underbody and suspension inspection (rear)
   Lower front of vehicle and raise rear using floor jack at rear differential or frame rail, support on jack stands at frame. Inspect rear differential for leaks, damage, or evidence of fluid overfill. Check rear leaf springs or coil springs for sagging, cracks, or broken leaves. Inspect rear shocks for leaks or damage. Check exhaust system from catalytic converters to tailpipe for rust, damage, holes, or loose hangers. Inspect fuel tank, fuel lines, and EVAP lines for damage or leaks. Check rear brake lines and parking brake cables. Verify spare tire present and properly secured with correct inflation pressure.
5. 5

   Engine compartment cold inspection
   With engine cold, open hood and inspect overall cleanliness (excessive degreasing may hide leaks). Check engine oil level and condition on dipstick - should be between MIN and MAX marks, golden to light brown color (black indicates overdue change, milky indicates coolant contamination). Check coolant level in reservoir - should be at COLD FILL line with proper orange color. Inspect for any visible oil leaks around valve covers, oil filter housing, oil pan gasket, and turbocharger oil feed/return lines. Check coolant hoses and intercooler hoses for cracks, soft spots, or bulges. Inspect serpentine belt for cracks, glazing, or fraying. Check battery terminals for corrosion and secure mounting. Verify all fluid reservoir caps present and properly seated. Look for evidence of aftermarket tuning or modifications.
6. 6

   Brake system inspection
   Inspect front brake pads through wheel spokes or with wheels off - minimum 3mm pad material remaining. Check rear brake pads or shoes similarly. Measure brake rotor thickness if possible and check for excessive scoring, warping, or rust ridge. Inspect brake calipers for leaks or seized slide pins. Check brake fluid level in master cylinder reservoir - should be between MIN and MAX. Inspect brake fluid color (should be clear to light amber; dark brown indicates old fluid). Use brake fluid test strips if available to check moisture content (replace if copper content above 200ppm). Check brake pedal feel - should be firm with no excessive travel or sponginess.
7. 7

   Interior inspection and controls
   Inspect all interior surfaces for wear, damage, or staining. Test all seats for proper operation including power adjustments, heating, and cooling if equipped. Check seatbelts for fraying and proper retraction. Test all window switches, door locks, and mirror adjustments. Verify climate control operates in all modes (heat, AC, defrost, fan speeds). Test audio system and all speakers. Check instrument cluster for warning lights at key-on (all should illuminate briefly then extinguish). Verify odometer reading matches service records and appears genuine. Test cruise control switches. Check center console, glove box, and overhead console operation. Inspect headliner for sagging or stains. Verify all interior lights function.
8. 8

   OBD-II diagnostic scan
   Connect OBD-II scanner to diagnostic port located below driver side dashboard. Turn ignition to ON position without starting engine. Retrieve and record any stored diagnostic trouble codes (DTCs) from all control modules including engine, transmission, ABS, airbag, and body control modules. Note both pending and confirmed codes. Check freeze frame data for any stored codes. Verify all readiness monitors are set (at least 6 of 8 for emissions compliance). Clear lack of readiness may indicate recent code clearing to hide issues. Record VIN from scanner and verify matches vehicle. Check for evidence of odometer tampering through mileage data in modules.
   ℹ️EcoBoost-specific codes to watch for: P0016/P0017 (timing correlation), P0299 (turbo underboost), P0420 (catalyst efficiency), P0456 (EVAP small leak), P0174 (system lean)
9. 9

   Cold start and initial engine operation
   Start engine and note behavior during cold start. Engine should start immediately without extended cranking or rough running. Listen for any unusual noises including knocking, ticking (especially from timing chain area at front of engine), or rattling. EcoBoost engines may have slight turbo whistle which is normal. Check for excessive white smoke from exhaust (indicates coolant consumption) or blue smoke (indicates oil consumption). Verify idle is smooth and steady around 600-700 RPM. Check that all warning lights extinguish after start. Let engine idle for 2-3 minutes while monitoring temperature gauge and checking for development of any fluid leaks.
   ⚠Timing chain rattle on cold start lasting more than 2-3 seconds may indicate stretched chain or failing phaser - common EcoBoost issue requiring expensive repair
10. 10

    Transmission and drivetrain test
    With engine at operating temperature, check transmission fluid color through dipstick or fill plug if equipped (should be red, not brown or burnt smelling). Test transmission through all gear ranges - shifts should be smooth without harsh engagement, slipping, or delays. In Drive, verify transmission upshifts and downshifts smoothly during gentle acceleration and deceleration. Test manual shift mode if equipped. Check for shuddering during light acceleration 25-45 MPH (may indicate torque converter issue). Verify 4WD or AWD engages if equipped and disengages properly. Listen for clunking from driveline during direction changes. Test parking pawl by parking on incline, setting brake, shifting to Park, then releasing brake - vehicle should not roll.
11. 11

    Road test and performance evaluation
    Perform road test on varied surfaces including highway speeds if possible. Check steering for proper alignment (vehicle should track straight without pulling), excessive play, or unusual noises. Test brakes from various speeds - should stop straight without pulling, pulsation, or noise. Verify adequate braking power without excessive pedal effort. Monitor engine temperature gauge remains in normal range. Test acceleration - EcoBoost should provide strong boost response without hesitation or surging. Listen for boost leaks (hissing under acceleration). Check for vibrations at idle, during acceleration, and at highway speed. Test handling through turns - no excessive body roll or wandering. Verify cruise control engages and maintains speed. Listen for wind noise or water leaks. Test rain-sensing wipers if equipped.
12. 12

    Hot engine inspection
    After road test with engine at full operating temperature, return to inspection area and perform hot inspection. Open hood and carefully check for any new fluid leaks that appeared only at operating temperature (common for valve cover gaskets, turbo oil lines, and coolant hoses). Listen for cooling fans cycling on and off properly. Check for any burning smells or smoking. Verify coolant level has not dropped significantly. Inspect turbocharger area for oil leaks at compressor or turbine housings. Check intercooler and intercooler piping for condensation or oil accumulation (small amount of moisture normal, but excessive oil indicates turbo seal failure). Monitor engine as it cools for unusual ticking or pinging sounds.
    ⚠️Engine components extremely hot after operation - allow cooling before touching any parts
    ℹ️Some intercooler condensation is normal on EcoBoost engines, but excessive water accumulation may cause rough running and stalling
13. 13

    Technology and safety systems verification
    Test all advanced driver assistance systems if equipped. Verify forward collision warning and automatic emergency braking function (low speed test in safe area if possible). Test blind spot monitoring and lane keeping assist. Check adaptive cruise control operation. Verify parking sensors and backup camera display properly with clear image. Test 360-degree camera if equipped. Check trailer brake controller if equipped. Verify SYNC infotainment system responds properly without freezing or rebooting. Test smartphone connectivity including Apple CarPlay and Android Auto. Check navigation system if equipped. Verify remote start function with key fob. Test tailgate power operation and lock.
14. 14

    Final fluid level verification and documentation
    Perform final check of all fluid levels with vehicle on level ground and engine warm. Recheck engine oil level (should remain between marks). Verify coolant at HOT FILL line. Check transmission fluid per manufacturer procedure if accessible. Verify brake fluid, power steering (electric - no fluid), and windshield washer levels. Inspect for any fluid leaks on ground where vehicle was parked. Take photos of odometer, VIN plate, engine compartment, underbody areas of concern, tire tread depth, and any damage or wear items noted. Compile comprehensive inspection report with all findings, DTCs retrieved, recommended repairs or maintenance, and overall vehicle assessment.

Reassembly

1. Ensure all inspection points have been checked and documented
2. Lower vehicle from jack stands safely and remove all tools from engine compartment
3. Reset tire pressures to specification on driver door jamb if adjusted during inspection
4. Clear any diagnostic codes only if they were confirmed as false/temporary after testing

Verification

• Review complete inspection checklist to ensure no items were missed
• Verify all warning lights are off except those that were noted in initial inspection
• Confirm no tools or equipment left in vehicle or engine compartment
• Provide buyer with detailed written report including all findings, recommended repairs with estimated costs, and overall vehicle condition assessment
• Recommend buyer review service history for evidence of EcoBoost-specific maintenance including spark plug replacement at 60k miles, transmission fluid changes, and any timing chain or turbocharger service

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