I received 4 O2 sensors but they were unheated. In the repair manual, it only talks about heated sensors. When I ordered the sensors, it did not say anything about unheated. Does it matter if they are unheated? I have already replaced the plugs and wires. Here in Oregon, by law, the parts store cannot clear codes. The first time I hooked up the OBDII reader, it gave a code of PO135 and PO134. Any help would be greatly appreciated.

 

P0135, PO134 means you have a dead front drivers side O2 sensor. If you bought an O2 sensor for a Disco I assume it is the correct kind. Where did you buy them from?

Rent or buy a scanner and clear the codes when you are done.