engine light on,car runs well,sometimes light goes off for days.

This annoying light comes and goes.Is there a device to determine the codes
and the probable fix.

 

yes there is a scan tool that will read out the fault. Does this vehicle
have a year/make and model?

Glenn Beasley
Chrysler Tech

 

Many Chrysler cars, particularly 80s/90s allow you to read the check
codes by:
-Turn the ignition switch on three times, leaving it on the third time.
-read the codes in two parts.
-the ending code is "5 5".

-the code explanations are in the maintenance book and also on the web.
http://www.allpar.com/fix/codes.html

 

could be something as simple as an oxegen sensor going bad or a leaky
gass cap both will cause this problem and are easy fixes. could also be
an air filter issue. try replaceing the oxegen sensor first very cheap
fix along with a new fuel filter and that may do it

 

Also, most Advance Auto parts and AutoZones have the code scanners and
will read the code out at no charge....