jtsullivan85 Posted February 18, 2023 Share Posted February 18, 2023 So just picked up a 2004 legacy L wagon and have no info on its history. I had to change the thermostat and noticed this sensor with no harness plug Attached and I don’t see any torn wires or anything from the harness leading down to it. Any help would be awesome! Link to comment Share on other sites More sharing options...
doublechaz Posted February 18, 2023 Share Posted February 18, 2023 Not sure, but at that position in the block I expect that is normally a block off plug into an oil passage. Does the car have an after market pressure guage or the remains of where one was mounted? Link to comment Share on other sites More sharing options...
jtsullivan85 Posted February 18, 2023 Author Share Posted February 18, 2023 Not that I can see, is it possible this is not the original ej251? Link to comment Share on other sites More sharing options...
jtsullivan85 Posted February 18, 2023 Author Share Posted February 18, 2023 Something has been done lol found some “adapted wires” from the top Link to comment Share on other sites More sharing options...
doublechaz Posted February 19, 2023 Share Posted February 19, 2023 Looks like that tape job goes to an oxygen sensor. Link to comment Share on other sites More sharing options...
silverton Posted February 19, 2023 Share Posted February 19, 2023 That's a block heater in the first picture, the one with the taped up wires could be your secondary O2 harness. Link to comment Share on other sites More sharing options...
jtsullivan85 Posted February 19, 2023 Author Share Posted February 19, 2023 Wow never would have figured out a block heater, is that normal on a 2004? Haven’t seen that on any other similar years as I watch a ton of videos to look for it, making me paranoid the previous owner put a different engine like an ej20 or really old ej25 Link to comment Share on other sites More sharing options...
silverton Posted February 19, 2023 Share Posted February 19, 2023 I see them occasionally across all the years... can sometimes indicate the car originated from a cold climate area where temps get below freezing. 1 Link to comment Share on other sites More sharing options...
doublechaz Posted February 20, 2023 Share Posted February 20, 2023 Ah, I've never lived somewhere cold enough for block heaters to be common. That makes sense by the location. Must be water jacket behind there. Link to comment Share on other sites More sharing options...
Infosecdad Posted February 20, 2023 Share Posted February 20, 2023 When I lived in WY you would opt for the block heater, when it was 30 below you really needed it... 1 Link to comment Share on other sites More sharing options...
doublechaz Posted February 20, 2023 Share Posted February 20, 2023 In the lower part of Michigan where I grew up there were only a few days in the year where the car cranked hard with thick oil so we just tolerated it. The Great Lakes make a mess of the snowfall, but they really soften the cold temperatures that happen to the west of us. Link to comment Share on other sites More sharing options...
jtsullivan85 Posted February 20, 2023 Author Share Posted February 20, 2023 Awesome thanks for the help, here in Florida we don’t see too many block heaters lol I got this car from a younger individual and have been slowly correcting the diy repairs that have been done, it’s kinda like a scavenger hunt like finding there was no air filter in the filter box.. 1 Link to comment Share on other sites More sharing options...
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