Bit of urgent help if possible....

What's that plugged onto the end of it? Kind of looks like a blind cap with rubber plugs where the two wires would go?

If so, it would seem to be something unused, so the 'where' might not be very important.

In LHD cars, I think something emerges from that same spot on the fuse box and goes to the brake fluid level sensor (which is right above there in LHD cars). Its wires are pink and white-with-black-stripe though, not red and blue.

You'll get the best answer in the least time if you just look in the UK RHD wiring diagram, accessed as described on this wiki page.

 

Did you clean the intake manifold also? It has EGR passages as well. Some info in link in my signature.

 

The intake manifold has the last leg of the EGR, on the way to the intake ports. The stainless steel pipe between EGR valve and iintake feeds the gasses in, they run through a long gallery*, then into capillary branches, one per engine intake port. The capillaries are approximately 1/4" inside diameter, prone to to clog with carbon, and unevenly so: for whatever reason the capillary at cylinder one (rightmost cylinder, at the "front" of the engine, the end with the beltless pulley, opposite end from the transaxle) is the first to clog. Perhaps related: the head gasket failures are commonly happening at that same end.

In a nutshell: until you clean the intake, in particular those EGR capillaries, the EGR cleaning is largely for naught. The intake cleaning is relatively easy, compared to the EGR valve/cooler. For the capillaries a slim bottle brush is good. I use a brush intended for cleaning stainless steel drinking straws, with brake cleaner.

Again, the EGR link in my signature has info: video links, tips, Repair Manual excerpts (with torque values).

* Toyota revised the EGR passages in the intake, perhaps in (North American) model year 2012, from one full width gallery feeding into four capillaries, to a shorter gallery, feeding into two intermediate passages, then the four capillaries. This was to be part of the "cure" for EGR issues, and a few years back they recommended to replace older intake manifolds with this revised intake, if there were problems. They also revised the EGR valve. Both those revisions haven't seemed to make much difference; the only thing effective (in my opinion) is periodic clean-out.

 

Windshield heater for wiper park position?

 

I think our 2010 has a loose connector in front of the engine and AC radiators; might be for radar cruise (which we don’t have).

 

There are three gaskets on the intake manifold: the main one at the interface between IM and the engine intake ports, one between throttle body and IM, and one at the interface of IM and EGR pipe.

Replacement of any or all is not mandatory; I didn't change any in the two times I've had the intake off ours, albeit only around 75K~85K kms on the odometer. The all looked fine.

That said, if you've got significantly more miles, and/or just want the peace of mind, new gaskets are not too expensive. I think the the main one, at the intake ports, is around $30 USD?

All 3 gaskets at the intake manifold are pliable/flexible material, so maybe a stronger argument to change. That's comparing the the EGR system gaskets, which are plain steel, stainless I think.

The repair manual* (maybe dogmatically?) says replace all the gaskets, intake manifold and EGR circuit (the steel ones), but I think you can make judgement call.

* The EGR link in my signature leads to a post with relevant Repair Manual excerpts.

 

It's a silicone gasket with some depth and resilience to it, so it is more reusable than old-style flat ones. Still, after ten years it can be kind of cooked and less resilient than it was. If you replace it now, the new one will probably stay resilient and confidently reusable for years more.

 

I replaced two of them because I didn't know about the third one on throttle body.
The one to engine intake ports was flat but still elastic.
The one to EGR pipe was fine I guess.

Anyway I've changed both. The engine one was 12 bucks and EGR pipe one around 4 bucks here.

 

The Felpro IM gasket I got came with the throttle body gasket as well. I didn't replace the o-shaped one between the IM and the EGR pipe.

Posted via the PriusChat mobile app.

 

Our 2004 Toyota Sienna has this feature. When I had the windshield replaced (due to a crack) I was initially sold one without the heating element. Then I got a replacement with the proper connector that is located right in the center bottom of the windshield, so just about where you noted your loose one ends. If the windshield/(sorry is it windscreen there?) was ever replaced it's possible that one without the heater was used. Then it would be left dangling like that....