I agree. One thing I noticed about the product being sold on eBay "http://www.ebay.com/itm/250912347681?item=250912347681&viewitem=&vxp=mtr", it switches between sensors every 30 seconds, this way we can keep engine lean through MAF and EFIE. Now, keeping engine on just one enhancer spawns error codes and shows engine light. It switches as soon as it time for ECU to raise error code. I hope and pray that this device may work for me, otherwise, it will be end of HHO for me! I've already tried performance chip, MAF enhancer alone, now its EFIE's turn.