Hello guys and gals,

I have a 2001 Volvo S40 and was able to replace the 02 sensor bank 1/sensor 1, fine and the t-stat fine. Supposedly the ect is also easy to replace.

My ect sensor seems stuck. I was able to wiggle the plastic pieces apart, but the actual sensor part is stuck. I tried using a 19 mm open end wrench and it seems to be just damaging the nut instead of moving it. I tried spraying some PB blaster and left it over night. Still no good.

Do I have to take it in and get some professional pneumatic ratchet to take this thing off? Do I have to cut the wire and plastic part off and then used to closed end part of the 19 mm wrench?

 

I had to continually soak and spray the nut end of the ect sensor with pb blaster for two days twice a day. I also did not drive it both days.

For the electrical end of the ect sensor, I used a thin, flat, small, five inch flat head screw driver to push the two pieces apart. There's a gap on top of the ect sensor where the "male" part of the connector fits in with the ect sensor.

 

I also had to replace the sensor itself in my passat '01 V6. It was a pain in the *** and I had the usual cuts and scrapes to cope. I also replaced the O-ring that goes with the sensor. My replacement was green, the original was black. As it was time for her, I simply drained and flushed the cooling system at the same time ... So, no problems of fluid loss.

 

I'm having same issue. Going to purchase an 19mm open box end wrench (box end with slot cut in it to slide over wire). Hope this works!