First you remove the cover from the diagnostic port under the driver's side of the dashboard. Then you plug the datalink cable from your scan tool into the diagnostic port. The scan tool will then show the diagnostic codes. Write them down and read a manual to see what has gone wrong.
how to reset check engine light on 1992 Mazda mpv
When the light comes on it's telling you to read the engine diagnostic codes.
It is the port, where a diagnostic machine can be hooked up. The diagnostic will read codes from your vehicles computer. For instance if your check engine light comes on, you can plug the diagnostic machine into the data port and it will tell you why the check engine light came on so that you can get it fixed.
To tell you to read the diagnostic codes.
read my answer to reseting engine codes below...2001 olds silhouette..
Diagnostic codes are generated by your on-board computer. They tell you what problems the computer has identified with your engine. The codes are numbers. The code numbers are read by an instrument that plugs into a special jack under the dash. Auto parts stores often will check your diagnostic codes for free, or you can have your dealer do it.
U check the codez
Hey DJ==No. Go to your local Auto Zone and they will read thm for free. GoodluckJoe
One can read the check engine codes without hiring a professional by checking the car manual. All car manuals describe how to read the codes for that car.
CHECK OWNERS GUIDE
How to read check engine codes on a 1999 chev 1500 suburban.
After replacing the EGR valve, use the diagnostic tool and erase codes then read the codes again. I had the same problem on my 97 geo metro. After replacing the egr valve, the check engine light stayed on. After a while it was suppose to clear itself but it didn't. So I went to autozone borrowed their diagnostic tool, erased the codes and then my car passed and the check engine light went off.