Post from UniChip Jack earlier in the thread
Quote:
Can this turn off a CEL for no cat? The Unichip doesn’t “turn off” fault lights because it doesn’t reflash the OE ECU. A reflash tells the ECU that something the OE programming says is a fault isn’t a fault; the condition (like removing the cats) still exists, but ECU just doesn’t thinks it’s a problem.
The Unichip creates a simulated condition to make the OE ECU believe everything is “normal” which means OE ECU never turns on the light in the first place… as with most things, you can get to the desired solution with either tuning approach. Perhaps the difference seems unimportant but it’s fundamental to the difference between the two approaches.
That said, “defeating” emissions system controls or cautions is a huge Federal legal issue with very steep penalties (like $100k for each violation) and banning the parts from future sale. That get’s our attention even if it doesn’t concern somebody else.
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