While the car is running, hold down the top and bottom buttons, I think they are reset and units, hold them down and turn the key like you are trying to turn over the car again. You will see the lights change, release the two buttons at the same time. Then use the select button to scroll through all the stuff, speed, RPM, engine temp, ect. At the end you will see the flashing 4 digit code...if you have one.
Personally I don't use that at all, because all it does is make me worry. For the longest time I would get the low voltage code, but my battery and alt are fine. Now I get the fuel sender circuit failure every once and a while. Nola has had that code come up now and again for the past 6 months. Nothing wrong so far.
ok I had this problem I took my car to ford where my friend works there a code that show egr valve has a restricted flow which is what u just did with the t/h fix I had to disconnect the battery for 15 min never had a problem yet, just disconnect the battery and see if the light come back on if it does remove the t/h fix and disconnect the battery for 10 to 15 min reconnect and see if the light come on if it does take to the dealer to get it check out if u leave the t/h fix in and take it to the dealer and they find it they might void ur warranty this is what I got for some info
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