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frontpage Posted by KimsreangK • Feb 20, 2025
Feb 20, 2025 7:11 PM
Item 1 of 2
Item 1 of 2
frontpage Posted by KimsreangK • Feb 20, 2025
Feb 20, 2025 7:11 PM
Gearwrench Professional Bi-Directional Diagnostic Scan Tool
+ Free Shipping$86
$150
42% offAmazon
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Usually looking at live data is going to be what you want to do here. First engine and cat need to be at full operating temp. You need to ensure your pre-cat sensor is switching from rich to clean, back and fourth constantly. This can be tricky since data you ready from OBDII is technically already processed and isn't true "real time" data. Anyway, after you confirm the pre cat O2 sensor is working you will need to look at the post cat sensor. The post cat sensor should be fairly steady, and occasional lean or rich even is ok, but it should stabilize pretty quickly. If you see constant switching (low to high that follows the precat O2) then its highly likely your Cat is bad and needs to be replaced.
Keep in mind that Catalytic converters WILL get poisoned by engines that are misfiring and essentially dummping raw fuel into the cat, also oil consuption or coolant consumption will also ruin your cats pretty quickly. So if your car suffers from misfires or consumes oil you will need should address it ASAP or your new cat will quickly fail too.
Cats should last hundreds of thousands of miles... My 06 BMW 330i that has 250K miles just started with symptoms of a bat cat, but that car has consumed oil its entire life due to a poorly designed PCV system that BMW completely redesigned for following years of the 3 series. 2015 definitely seems like premature failure of the cat unless you have a ton of miles (think 200k-300K+)
edit: I forgot to mention that sometimes people have had success with products like "CataClean" to get their cats back up to a more functional state.
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Be very careful plunking down substantial money for that.
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For example, the locks don't lock when you hit the button, is it the button, the module (what every calls a computer), the wires, etc... well the Bi-directional tool will allow you to trigger the lock mechanism thru the computer without the button or button's wiring. If it works you know to look at the button or the wiring from the button, if it doesn't work you look at the module.
There are TONS of useful features for the bi-directional support. In fact I would almost go as far as saying that tools that aren't bi-directional are not really worth purchasing.... ALMOST....
This feature isn't going to work for every car.
Do your research into what works and what doesn't for your specific model, as you might end up limited to the same number of features you'd find on a generic $10 adapter.
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Maybe you need an asterisk next to you for even suggesting a $10 tool can do what a properly designed bi-directional tool can do. Even doing a full system scan is an impossibility for cheap tools. Many times you are lucky to even get a cheap tool to even read a TCM codes much less any other module codes.
And what I clarified was that a bi-directional tool is going to be just as good as a $10 Bluetooth module if your car doesn't support any of the features the more expensive scan tool provides.
This isn't even the cheapest bi-directional scanner on the market, so it's clearly about what the ECU allows versus what the tool costs.
"My test connection to my 2025 Subaru Forester went fine, it was able to poll the subsystem topology, and from there I could go into more detailed diagnostic information or grab live data. I was impressed with all the things it found on my Subaru to get data on, even the EyeSight (navigation helper) system. About the only hiccup was it would only let me set vehicle years up to 2022, but after choosing 2022 it appeared to work fine. It even found an air conditioning fault code I didn't know I had."
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I bought the Gearwrench before the holidays for $125 because I wanted something that could do a CVT relearn on my 2022 Subaru Crosstrek. It works just fine for that and many others things, albeit a bit slow. For the average DIY'er it's a great scan tool to have.
Lifetime updates and they where saying that will add for free the topology mapping
They also coming in march april with model 191 offline one
Edit: I also have a Bluedriver (meh) and a cheaper adapter that I believe works with OBD Jscan, or seemed to on my old Jeep.
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