Check Engine light while driving only?

Question

Drove to Lubbock Tx from Odessa TX ( 100 miles ) and while driving for a alittle ( 70 mph ) while the check engine light came on but when i got back into town and dropped speeds ( 45mph etc ) the light went off- happened twice this wknd- when i got to LBB and got back to odessa- any ideas- oxygen sensor, maybe- just did a recent tuneup on car-plugs/wires- antifreeze-oil change-and new vacuum hose ( had a small leak )-- i know put it on the machine and it will tell you BUT the ck engine light isnt on and the car works just fine.....itchin my head....yes i know take it in...but question is, what do you think it could be...thank you for reading my question : )

Answer 1

could be a number of things but with out diagnostic equipment hooked up to your car its only best guess,but check the air cleaner tube(black tube that engine get fresh air from)or check something that may have been left loose or not connected,unfortunately the repair of automobiles is not a guessing game you can only do so much then you have to turn it over to the pros.

Answer 2

Could be many things causing this, get it diagnosed, not code read.

Answer 3

Need more info! make, model, year, mileage. The more info, the better the help!  Wild guess.......iat sensor.

Answer 4

the only way to know is to have the code(s) read. even if its out now, whatever the code was would be stored in history codes.reading the code will tell you what sensor is being effected. to diagnose it is to pinpoint it then  fix it.

Answer 5

check codes

Answer 6

Do you have an auto zone parts store near you?If you do they read the codes for free.That will tell you the fault code and you maybe can fix it yourself.

Answer 7

What kind of car is it?

Answer 8

Did you get gas before the light came on..A loose fitting gas cap will cause your check engine light to come on as well...Take it to Advance Auto the can check it for you for free....Or Autozone as well....

Answer 9

Could be a lot of things. O2 and catalytic converter are not bad guesses I suppose. I'd more suspect a problem with the fuel tank venting system, or a temp sensor going marginal. I guess that doesn't help much. The code is still stored even if te light is out, at least for a while. You can get it read for free at Autozone or Midas. DON'T just change whatever the code says is wrong. It just tells you the area or circuit that needs checking. It just narrows the search down for you.