2003 four stroke 140 Johnson Check Engine Light No codes

terykely

Cadet
Joined
Oct 12, 2019
Messages
18
2003 4 stroke 140HP Johnson check engine light on tach comes on. 2 different mechanics say the motor is throwing no codes whatsoever. Is it a faulty tach? I'm stumped.
 

Crosbyman

Vice Admiral
Joined
Nov 5, 2006
Messages
5,811
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2003 4 stroke 140HP Johnson check engine light

some issues how up with bad tach or oil change "reset" ?
 

jakedaawg

Rear Admiral
Joined
Jun 26, 2012
Messages
4,275
It's probably a bad system check guage. I replace several every year. Common enough that I stock two.

Did the mechanics have J/E software? I am surprised they didnt just sell you a guage....
 
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