How do I reset diagnostic codes on 2002 ford ranger to make sure repair was successful ? Ron

reset successfully ? how ? Disconnect battery terminals ? With a scan tool ? If the air bag light is lit , code's are stored pointing to a diagnostic direction . Your best bet mite be to take it to a qualified repair shop.

I, feel sorry for you, after reading your problem, but don't worry you visit the Reliable-Store they will help you for sure.
2002 Ford Ranger Workshop Repair Service Manual PDF Download

Ford Check Engine light Codes - FreeAutoMechanic

www.freeautomechanic.com/diagnostictroblecodes7.html

Full list of OBD I Diagnostic Trouble Codes for your Ford Vehicle. If your Check engine light is on you may have a serious problem. Scan your codes and follow ...

EEC-IV 2 and 3 digit trouble codes. - Ford Explorer and Ranger ...

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EEC-IV Diagnostic Trouble Codes - Diagnose problems in

Code 12
Lost Battery Feed 9 (Dead battery or battery disconnected) The Airbag diagnostic module must be reset.

remove the neg battery terminal for 10 minutes and see if that resets the code,, if not, you need to take it to someone who has a obd code reader, and have them do the reset

New EGR Valve

code p1400 is a DPF EGR sensor CIRCUIT LOW VOLTAGE detected. most likely is a problem with the wiring to the egr or dpfe sensor. the pinpoint tests for code p1400 instruct you to test all wiring before replaceing the egr or dpfe sensor

U can reset it with a code reader or scanner at the diagnostic connector under the dash or u can disconnect the negative battery cable for 3 minutes

sounds like you have a bad temp. sending unit. Go to a parts store and have them scan your computer and they can translate the code and tell you for sure. Check your coolant and make sure it is full and clean.

Code P0301
Ignition Coil Pack
Ignition Cable
Spark plug
Clog or dirty fuel injector
Evap canister purge valve
Engine Compression
fuel pressure

you have 3 type of engine for your truck
2.3L 4 cylinder
3.0L 6 Cylinder
4.0L 6 Cylinder

need to know that type Engine

The reason why the service light come on because it is a hard code
not a soft code.

Let me know