So I tackled the 3rd and 4th pressure switch DIY (great DIY post) last night, along with my 2x3 with Redline ATF. https://acurazine.com/forums/3g-tl-2004-2008-93/110-b-diy-guide-replacing-3rd-4th-gear-pressure-switch-3g-tl-2007-2008-a-840630/

Drove the car for a few blocks and got code P0873 and the MIL informed me that the transmission is experiencing blah blah and I might experience hard shifting.

I searched the code, but only came up with one or two results, one coming from the RL forum stating:
"P0873 Open in 4th Clutch Transmission Fluid Pressure Switch Circuit, or 4th Clutch Transmission
Fluid Pressure Switch Stuck OFF" https://acurazine.com/forums/2g-rl-2005-2012-76/006-error-codes-good-know-before-stealership-takes-you-ride-jargon-748693/


Has this happened to anyone else before? Perhaps I got trans fluid or dirt in one of the sensor connectors? I read the entire DIY post, and I'm 100% sure I put the right connectors in the correct spots. Just inquiring before I tear it all down again

Thanks,

 

Recheck the connections then disconnect the battery for 15 mins. Maybe it'll go away.

 

...or you possibly installed them backwards. Or, they are just bad. If you kept your old ones, you can swap and see.

Make sure that you did not damage a wire, either.

 

Thanks. I went back to the DIY post and there still seems to be confusion as to whether two of the sensors are for 4th gear and one for 3rd gear, and vice versa. I used quantity 1 part# 28610-RKE-004 for 3rd gear under the wheel well.

I need to know if that is indeed where the 3rd gear sensor goes and if it's the correct part number. Looking at the old sensor is useless bc any identifiable part number is worn away.

 

Did you try to delete the code and see if it returns?

 

Low and behold, my dumb*ss forgot to plug in the connector to the pressure sensor

I blame the fact that it was 2:30am and about 11 beers later when I was completing the original DIY

Car shifts like a dream.

And yes to confirm: For 07-08 the two pressure sensors on top are for 4th gear. The one below that you access under the wheel well is for 3rd gear.