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I would think one of the Motorcraft up stream sensors, though I'm not sure the difference between the two part numbers. Sometimes one part number replaces another, sometimes one part number applies to certain years and the other to other years, or in this case it could just be Bank1 vs Bank2...

I took a better look at the description of P0151, sensor 1 is before the catalytic converter. This would not be caused by the whole defouler situation. How long ago did you have the downpipes installed? If it were recent I'd talk to the shop.

Correct, that extension between the sensor and the threaded bung in the downpipe is the defouler. I'm 99% sure they're only needed for the post-cat O2 sensors. Disclaimer: I've never done this mod, just seen this issue come up enough here to know.

No. You remove the O2 sensors, install defoulers where the O2 senors go, then install the O2 sensors in the defoulers.

It's always the defoulers. Didn't they come with the downpipes?

It depends, maybe on how new the vehicle is? I recently took my '95 Chevy K1500 out of storage. It had been sitting for over a year. Gave it a jump, cranked right up. I drove it around for 20-30 minutes. Stopped at a self car wash to hose off the dirt from sitting in a parking garage for a...

Are the kinks worked out on these things, or is it still a tradeoff between a big screen and some loss of funtionality/integration?

You can scratch the Platinum off the list as competition for the ST/Tremor, they're dropping the 3.0L as an option. https://fordauthority.com/2025/06/2026-ford-explorer-platinum-drops-3-0l-v6-ecoboost/

An engine that hasn't been in production in two decades? Come on now. Everyone else here knows we're talking about the 3.0L Nano Ecoboost.

The same two turbos attached to the 3.0 no matter what platform it's in?

Do you want it running all the time, including parking mode, or are you just interested in running it while the vehicle is driving? The later is easiest to power with an adapter connected to the powered mirror.

https://www.caranddriver.com/news/a65044784/2025-ford-f-150-lobo-revealed/

Im pretty sure then answer is going to be defoulers for the O2 sensors.

Between the rubber boots and the tackiness of the grease, there should be some slight resistance. As long at the movement is smooth and doesn't bind anywhere it will be fine.

Hell you can buy one yourself for less than $400

Yeah it's pretty worthless for anything outside of charging a laptop. You'd be better off getting a 12v vacuum or running an inverter.

Forscan Lite if you want to go the smart phone and/or tablet route.

Something weird is happening. I got a notification email from a generic "Forum Support" instead of the usual "Explorer ST Forum".

Did it looks like this?