Date registered: Nov 2005
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'99 E320 Intake Air Temperature Sensor MOD. Check Engine Light now.
I have replaced a module from http://www.20horsepower.com/. Mercedes has 5 wires coming out of the IAT Sensor. The unit has 4 wires, 2 on each side of the unit. I have connected back 3 wires to their original wire and plugged the remaining2 wires to conenct to the mod unit. I thought I new with a voltmeter which was postive and which was negative. Everything seems to be running fine , except the increase in 20 HP, but I now have a "Check Engine" light on. I have pulled th battery cable to reset things. I just want to get rid of the check engine light... Does anyone know the colors codes of the wires? Which is + and which is -?
Any help is appreciated.[:(]