Can you use this to diagnosis why check engine light is on and figure out why car wont start? even of car wont start?

MS309 is a OBD2 scanner that can read and clear codes on OBD2 system and help figure out why check engine light is on.

Will this work on a 2002 for explorer sport trac

Yes, MS309 can work on the 2002 Ford Explorer.

i used this tool and all is said was manufacturer control. no code number with it? what does that mean? 1998 ford explorer sport.

OBD2 is the standard across all US cars. Some manufacturers also add brand specific codes, which may or may not be supported by the code reader. Sound like you have a vehicle/manufacturer specific code not supported by a $20 reader.

Can this disable my key?

No, it can't. please check KM100/ IM508/ IM608.

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Description

🚗 Unlock your car’s secrets — Diagnose, decode, and dominate the road!

SMOG CHECK READY - Check I/M Readiness monitors to avoid costly failed emissions tests and wasted time.
SAVE MONEY TIME - Identify issues early, avoid repair shop markups, and reset your Check Engine Light yourself.
UNIVERSAL COMPATIBILITY - Works with 99% of OBD2-compliant vehicles worldwide — your all-in-one diagnostic sidekick.
FREEZE FRAME DATA INSIGHT - Access real-time engine parameters like RPM, fuel pressure, and coolant temp for precise troubleshooting.
DECODE DIAGNOSE IN SECONDS - Built-in database with 3000+ DTCs means no more Googling error codes.

The Autel OBD2 Scanner MS309 is a compact, plug-and-play diagnostic tool designed for 99% of OBD2-compliant vehicles. Featuring an upgraded chip, it quickly retrieves and clears generic and manufacturer-specific fault codes, displays over 3000 DTC definitions on-screen, and provides freeze frame data and vehicle info. It helps users reset Check Engine Lights, check emission readiness, and prepare for smog tests, saving time and money on repairs. Backed by a 12-month warranty and lifetime support, it’s an essential gadget for proactive car owners.

Specifications

Brand	Autel
Product Dimensions	2.74"L x 0.8"W x 4.34"H
Display resolution	128x64
UPC	508825559005 891638744721 713524943653 755263547778 608225589081 193195983767 634425760166 193195983507 675234379934 702565320417 669954576292 647904097028 712407252318 707273312143
Global Trade Identification Number	00193195983507, 00508825559005, 00608225589081, 00634425760166, 00647904097028, 00669954576292, 00702565320417, 00707273312143, 00712407252318, 00713524943653, 00755263547778, 00891638744721, 06900738022869, 06901649345931, 06903119834068, 06920172337862, 06923430013232, 06923788980576, 06925470121717, 06937357200088, 06939164313111, 06941221067530, 06951300480273, 06951300480280, 06957740531742, 07405055062424, 08414761531598, 09059845861223, 09328105968935
Manufacturer	Autel
OEM Part Number	Supports CAN (Controller Area Network) and all other current OBD II protocols
Model	Autel MaxiScan
Item Weight	6.3 ounces
Item model number	00063-25
Is Discontinued By Manufacturer	No
Exterior	Brushed
Manufacturer Part Number	00063-25
ABPA Partslink Number	MS1234567
Bulb Type	LED
Special Features	Displays DTC definitions on screen, Displays monitor and I/M readiness status (emissions), Erases Codes and turns off Check Engine Lights, Turns off Check Engine Light, clears codes and resets monitors, Views freeze frame data
Lift Type	manual
Voltage	12 Volts