Mojo85

If the engine light was reset, can an OBDII reader be still able to retrive the error?

I am asking because, after doing a compression test done by the mechnic, when everything was all done, noticed the light turned on on its first start. So I told him and he just cleared the light and said that it probly triggered a sensor (it was the Cams).

Said to see if the light turns on again in a few days to come back.

So when I turn off the car and turn it back on, if there was really a problem, would the engine light turn on again or would it be ignored?

Pearl-lude99

If the light is on Yes you can check the code with an OBD2 scanner.However as soon as u disconnect the battery or reset the code with a scanner it can;t be retrieved unless ur scanner can save data.. Also,yes and no about the light coming on when u turn ur car on. If it's a major problem it could come on right away,then u should get it checked out asap. However it could come back to u in a day or two or not at all..Just keep and eye out for it,chances are he did trigger something by doing it, it happens..

Mojo85

thats Pearl-Lude99, that answered some of my questions but not all,

I worded my question wrong, I am not talking about saving past history, what I mean is when the code is reset (lets assume there IS a problem), would a light come on once the car does a diagnoistic on its self or will it ignore the problem and not flash a light since its been seen and reset by the user (mechanic).

crashandburn

If you clear the CEL but the problem remains, then the CEL will return. Every time.

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Pearl-lude99

That's what i meant when i said "IF there is a major problem the light could come on right away,and by saving data the only thing i meant by that is a scanner can hold data sometimes,So if ur light comes back on u got a problem..

Mojo85

Other day I went on a long trip, approx 600KM. The CEL light and ATTS light on approx at 580KM, I checked the oil and some of the fluids, everything looked fine. Turn the car back on and both lights are still on, I continue for the rest 20KM where then I made a stop for approx. 3hrs.

Now I was ready to go back (another 600KM) but really worried about what the light could be. I turn on the car and both lights were not there...=S....made me happy but was still worried if there is still a problem. Any idea why both CEL and ATTS come on?

axcutiex2xluv

if you have a good scanner like a mac tools for example, it can pick up the codes that are erased, those are called soft codes

Pearl-lude99

I have the Snap On MODIS. Newest scanner out,it works wonders...

Mojo85

a quick search on ebay showed it for almost $4,000!!!!!!!!! thats 1/3 the cost of what I paid for the lude!!!!

Pearl-lude99

Actually the scanner costs that much, then u have to buy the chips for makes of cars and ur Connectors,it was actually $8g's...