Quick answer: Check Engine Light / OBD2 Diagnosis on a 2015–2019 Ford Explorer is rated Easy and takes about 15-30 minutes. You'll need 2 tools for this job, and parts cost about $25. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name |
Part Number |
Price |
Buy |
| OBD2 scanner |
— |
$25.00 |
|
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Step-by-Step Instructions
Follow these steps carefully
1
Weigh the warning before driving on
Steady lamp = stored fault, diagnose soon; flashing = active misfire — ease off, pull over, protect the converters. These engines have documented timing-system sensitivities: a cam-correlation code deserves prompt attention, not weeks of driving.
🔧 Mechanic's note — Ray Delgado
Chain rattle on a cold start is the sound that makes me stop driving, not keep commuting — I've learned that's the timing system telling me it's unhappy.
2
Hook the scanner to the data link
Ignition off: 16-pin OBD-II port under the driver's dash near the steering column. Seat the scanner straight in, ignition to ON (don't start), confirm link and live data. Won't connect? Try another adapter and check the accessory-power fuse.
3
Scan codes, freeze-frame, and cam data
Known faults: P0019/P0017-family cam-timing codes (Ford covers debris-related VCT faults on 2015–2020), P0299 underboost on EcoBoosts, P0300 misfires (plugs wear early), P013A/P013C slow O2 response on the 3.5L, P0456 EVAP. Add cam-vs-crank correlation, VCT duty cycle, misfire counters. Don't clear yet.
4
Trace the code to the right system
Misfires: inspect plugs and coils (EcoBoost plugs wear faster than the book interval). P0299: check charge-air hoses/clamps. P0456: inspect filler area and EVAP hoses.
🔧 Mechanic's note — Tom Becker
Check the oil before anything else on cam-timing codes — I've seen P0019s caused by nothing but low oil starving the phasers.
5
Repair, clear, and complete the monitors
Fix the confirmed cause, clear codes. Ford drive cycle over 50–100 miles: cold start, idle, steady highway, city stop-and-go, so monitors complete. Rescan: no codes, monitors complete. Timing-chain/VCT internals, turbo issues, persistent catalyst codes, or instantly-returning codes = professional.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Replacing parts based on a code without checking wiring, connectors, or vacuum leaks
- • Clearing codes before recording confirmed, pending, and permanent codes
- • Using a scanner that cannot communicate with the vehicle protocol
- • Treating a stored code as proof that the named sensor itself failed
