i'm at my wits end with this thing

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01-26-20, 09:52 PM

#31

dakiwi13

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Quote:

Originally Posted by Xavier56

Hi had the almost the same nightmare your having - changing all the parts you did.
I found out you need to have a Code Reader that can read engine live data like STFT and LTFT on both banks
You can see which one has a issue or both.

Then like others said I replace the O2 or Air Ratio sensors in the Pipes -
I had one Fake one that cause issues and a Second one that was New was Bad.
Just because it is brand new does not Guarantee it is good.
Good Luck

i'm thinking the o2 sensors went bad even after putting new ones on since they were there for a few months before i replaced the cats. which sensors belong to which position? i'm going to replace them all at one time to be safe. how many total are there? i've read 3 and also 4. so i don't know how many total

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01-27-20, 06:06 AM

#32

Margate330

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Hi dakiwi13, Saying it one more time and I leave it alone I promise. lol

You need a scanner with live data to get thru this or you are wasting your time and money.

PS- Buy your own and keep it with you at all times- best money $ you ever spent.

Last edited by Margate330; 01-27-20 at 06:18 AM.

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01-27-20, 06:50 AM

#33

Nad1370

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Quote:

Originally Posted by Margate330

Hi dakiwi13, Saying it one more time and I leave it alone I promise. lol

You need a scanner with live data to get thru this or you are wasting your time and money.

PS- Buy your own and keep it with you at all times- best money $ you ever spent.

+1 on this ^^

If it is indeed a failed(failing) AF sensor(s), please get an OEM/Denso genuine part.
There are a lot of FAKE Denso’s out there.

BTW, there are 2 AF sensors.
One on each bank located at the exhaust manifold.
And 1 O2 sensor located before the main CAT (underneath the driver seat under carraige)

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01-27-20, 07:46 AM

#34

Audiqv8

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If you have an Android phone or tablet go to Google Play Store and buy Torque Pro, then go to Amazon and buy a Bluetooth OBDII adapter. Learn how to use the software. The total cost should be under $20.

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01-27-20, 08:33 AM

#35

99SC4C

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I use this setup on my SC400. The SC throws a fault Throttle Position Sensor about every 10,000 miles or so; I have to coast to the side of the road (5 mph limit) to reset the code, then I'm good for a long time. Had the TPS replaced, but it still comes back sporadically. With the wireless OBDII always installed, I start Torque Pro and do the reset, then good to go.

I suspect the caps in the ECU are failing, but don't know who can repair the ECU properly.

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01-27-20, 08:03 PM

#36

dakiwi13

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Quote:

Originally Posted by Margate330

Hi dakiwi13, Saying it one more time and I leave it alone I promise. lol

You need a scanner with live data to get thru this or you are wasting your time and money.

PS- Buy your own and keep it with you at all times- best money $ you ever spent.

i have it done already, it's on my phone, i just gotta get it onto this page to show the numbers

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01-28-20, 03:23 AM

#37

carguy07

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Quote:

Originally Posted by dakiwi13

a mobile mech came to my house and ran live engine data on it. i have pics on my phone of the data

You can't test sensors or cats with a scanner??

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01-28-20, 03:28 AM

#38

MattNXF

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Quote:

Originally Posted by Audiqv8

Bank1 sensor 1 and Bank2 sensor 1 are air-fuel ratio sensors and not O2 sensor. If you replaced them with O2 sensors then that is your problem.

https://shop.advanceautoparts.com/fi...l-ratio-sensor

You're driving a 20yr old car. "They get old and brake"... You can't expect the same reliability of a 3yr car..

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01-28-20, 08:40 AM

#39

Margate330

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Quote:

Originally Posted by Nad1370

...There are a lot of FAKE Denso’s out there.)

This happened to me too!

I bought a fake Denso Air/Fuel sensor on ebay in a OEM Toyota box.

Car ran like crap and thew Check Engine Light immediately- bought an genuine Denso at autoparts store and problem fixed.

Last edited by Margate330; 01-28-20 at 08:54 AM.

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01-28-20, 08:58 AM

#40

Xavier56

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Yes Like I said Earlier exact same with me - I got Two Fakes from Two Different Sellers -

Note ; they both refunded money once I said were fakes - no questions asked.

Once Replaced with real ones from Local Auto Parts Store -

Started Car with Code Reader reading live data from STFT and LTFT - All Fixed

I knew right away from Data Seen