It can be almost immediate depending on which monitor. The amount and specific monitors vary between autos. Some monitors will not run if there is a different monitor that fails. Typically, there is a drive cycle that must be performed for all of the monitors to set. This also varies from car to car. In most instances the cooling system and fuel temperature must be ambient or the same before beginning. Unless your car has a fuel temperature sensor, the drive cycle must start from a cold start. This can be a tough operation to perform and complete due to other traffic or speed limits or signals. If you are unable to follow it, all the monitors do not reset.
Cars and trucks 1996 and newer are OBD2. You must run the OBD2 drive cycle yo reset the readiness monitors. The drive cycle varies among manufactures. Some garages can give you a print out of what you need to do. Keep running it, take it on the interstate and through town, some cars take a few hundred miles to set the monitors. Load up the family or take some friends and go on a road trip might as well have fun while resetting the computer.
about 20mins
It should eventually go out, after a few driving cycles, but may not. You should have reset the computer with a OBD2 scan tool after replacing the O2 sensor. Now, if the O2 sensor is not the problem, the light will not go out and even after you reset it then it will just come back on.
Buy yourself an OBD2 scanner and you can turn off the light whenever you want whenever it comes on and you can see why it has been turned on....or take it to a mechanic and have him use the same technique, ( if you know a mechanic yourself he might just have an OBD2 scanner or find someone with one
It should reset right away.
How long does it take for the computer to reset on VW jetta after service of engine light problem. Won't pass smog drove 130 miles has not reset?
50 miles or more
There is more than 1 way to do it. Obd2 reader can reset the code as long as it is fixed. If you do not have that or can not borrow 1 then do this. Open the hood, take and loosen the bolts to both the negative and the positive battery cable connections. Take them off and hold them together for about 45 seconds. Put the positive on first then the negative, tighten the bolts and go and start the car. You will see once started it will run a quick check and the codes will be reset. This is very ez and do not be afraid of the cables, they are not hooked to the battery and carry no juice. Good luck:)
reset is easly, take it to autozone and they will reset it free. the real question is why is it coming on ? get them to diagnose the system and it will give a code. once you know the code you can get help from them on part replacement or say just tighten the gas cap. Codes come up for a multitude of reasons like loose gas cap to say major engine electronic failure. But you won't know until you get the code. You can purchase code readers for obd2 systems from walmart to autozone, vary in price from $ 59.00 to $ 300.00. depending on what you want the code reader to do.
every time i do it, it takes hours...they suck
It usually takes about 4 minutes from start to finish.
Many of the OBD2 diagnostic scan tools allow you to clear the codes. You can borrow, rent or buy an OBD2 code scanner at most auto parts retailers. However... once a problem has been properly corrected, most codes will clear themselves after the engine has "cycled" a few times. A 2007 Tahoe does not use OBD2, it uses CAN for communications. A scan tool must be CAN equiped to clear DTC's. Also, it may take up to sixty drive cycles before the VCM turns off the SES, so it will take awhile.