Check engine light

[Dad's Car]

I just inherited my dad's 2000 explorer xlt. He has had a problem with the check engine light for years. We tightened the gas cap, replaced the tube? from the gas cap to the tank and we have also gave it a tune up. Dad didnt drive the car much. Just around town. Now it is time to have it inspected and it won't pass because of the check engine light. (In the past they were able to turn off the light to pass the car but now it wont go off).
The mechanic says it is running lean and there is a slight leak in the manifold that might be causing the check engine light to stay on.
Does this sound right to you?

 

[YMMV]

Did the mechanic pull the codes? What are the codes? Its a guessing game till you pull the codes. Post the codes and Im sure people can chime in.

 

[1Aauto]

If you run the code, it'll point you in a direction as to what the issue may be.

 

[rcchesh]

my 2000 v-6 ford ranger has a check engine light on with trouble code p1551 the repair shop says bad o2 sensor , plugs and wires , throttle carbon build-up and clogging fuel injectors. any thoughts I
thought it was just the o2 sensor . engine has 225,000 .