How long does it take CEL to turn on?

Ghostrider

Registered User
I just finished my plugs, wires and cleaning MAF an throttle body. In the vent I did something wrong how long would it take the CEL to come on? I would rather fix it on a weekend than have trouble show up a week later on a long trip.
 
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Did you disconnect the battery when you were doing the work? If not, then any cel codes should show up sooner then later. If you disconnected the battery, all of the sensors have to through a "drive cycle" before they may throw a code. At least thats my understanding. The drive cycles vary. I recently replaced my downstream o2 sensor due to a cat deficiency code it was throwing. I disconnected the battery before doing the work. It has been over a week and no more codes. But last i checked, the catalytic sensor was still showing incomplete. My take on that is that it hasnt had a complete drive cycle yet, even though it has been driven daily ever since the work was done. I tried to force the cycle to complete based on some info i found here, but it didnt work.
 

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