Hi Guys, sorry to be a pain but as I have posted 2/3 times this week I am still at a loss. To recap. I have replaced the 02 sensor on my 1998 avensis 7A-FE engine. The engine was running rich and the garage diagnosed the fault to be 02 sensor faulty. On replacing the sensor I drove about 12 miles and the eml came on . I took the car to the garage again and they diagnosed the 02 heater circuit faulty. I returned the part and got a replacement. Again the light came on after about 12 miles (pleas