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I used bosch oem sensors...tried splices then went with plug ins ....



That's your problem. The universal Bosch O2 sensors have to be custom wired. You can't just plug them in.

On the engine wiring harness side here is the correct color code and function. Match that up to the color code and function provided with the sensors:


Front O2 sensor:

Yellow/white - O2 +
Blue - O2 - (ground)
Lt green/red - Either heater wire
Red/green - Either heater wire

Rear O2 sensor:

Blue - O2 +
Yellow/white - O2 - (ground)
Green/blue - Either heater wire
Black/red - Either heater wire

1998 Sportage - Gone.
2004 Honda Civic Coupe.
2007 Suzuki Grand Vitara - She got it.