Not the O2 Sensor? - Toyota Nation Forum : Toyota Car and Truck Forums
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post #1 of 20 Old 01-28-2019, 08:10 PM Thread Starter
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Not the O2 Sensor?

Hey there,
I've got a 2013 Tacoma with 65k on it. My check engine light recently came on and it rang up as my rear O2 sensor. After replacing said sensor the light stayed on. I "turned it off" disconnecting the battery but 20 miles later it was back on. Assuming there are no holes in the exhaust is there anything else it could be? I can't imagine I botched the direct swap replacement.
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post #2 of 20 Old 01-28-2019, 10:25 PM
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What was the exact code that was pulled?

Yer best bet is to use an OBDII scanner/reader with live data graphing so you can actually see how the O2 sensor is responding/reporting. It could be a bad wire in the circuit. BTW, what brand/model was the O2 sensor you replaced it with? If it was a Bosch, I won't be surprised it didn't work. Those don't seem to work well on Toyota vehicles.
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post #3 of 20 Old 01-29-2019, 08:28 AM
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i believe there's 2 of the O2 sensors, one before the cat and theres one by the passenger side. 2 differnent makes too. they're not the same
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post #4 of 20 Old 01-29-2019, 09:15 AM
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Assuming you have the 4.0L V6 (1GR-FE) engine, here is some info that should help you...


Bank 1 = passenger (right) side
Bank 2 = driver (left) side

Sensor 1 = upstream, before the CAT. These are air/fuel ratio sensors
Sensor 2 = downstream, after the CAT. These are heated oxygen sensors.


Bank 1 Sensor 1 = Toyota part # 89467-04020 (Denso part # 234-9051)
Bank 1 Sensor 2 = Toyota part # 89465-04290 (Denso part # 234-4261)

Bank 2 Sensor 1 = Toyota part # 89467-04020 (Denso part # 234-9051)
Bank 2 Sensor 2 = Toyota part # 89465-04300 (Denso part # 234-4260)


The original sensors are Denso. If you buy them from Toyota, they are EXPENSIVE! I opted to replace all of my sensors with the Denso aftermarket part numbers for about half of the price. What is the difference between the OEM Denso and aftermarket Denso? I do not know.
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post #5 of 20 Old 01-29-2019, 10:26 AM Thread Starter
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Thank you all,
So this is a 4 cyclinder, I'm pretty sure the code was for bank 1 sensor 2. But, I'm only saying this because I looked it up afterward and it matches with what nafterclifen said. The type of reader was just some little toy advanced auto handed me and told me to go plug it in. I think on my way home i'll be able to pass a dealership and see if they're scanner identifies the same one, and to double check which code it is.
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post #6 of 20 Old 01-29-2019, 11:18 AM
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Quote:
Originally Posted by Nafterclifen View Post
Assuming you have the 4.0L V6 (1GR-FE) engine, here is some info that should help you...





Bank 1 = passenger (right) side

Bank 2 = driver (left) side



Sensor 1 = upstream, before the CAT. These are air/fuel ratio sensors

Sensor 2 = downstream, after the CAT. These are heated oxygen sensors.





Bank 1 Sensor 1 = Toyota part # 89467-04020 (Denso part # 234-9051)

Bank 1 Sensor 2 = Toyota part # 89465-04290 (Denso part # 234-4261)



Bank 2 Sensor 1 = Toyota part # 89467-04020 (Denso part # 234-9051)

Bank 2 Sensor 2 = Toyota part # 89465-04300 (Denso part # 234-4260)





The original sensors are Denso. If you buy them from Toyota, they are EXPENSIVE! I opted to replace all of my sensors with the Denso aftermarket part numbers for about half of the price. What is the difference between the OEM Denso and aftermarket Denso? I do not know.
Your original Denso downstream sensor from Rockauto is $46. I only would use Denso.

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post #7 of 20 Old 01-29-2019, 11:28 AM
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Quote:
Originally Posted by mad-dogg View Post
Thank you all,

So this is a 4 cyclinder, I'm pretty sure the code was for bank 1 sensor 2. But, I'm only saying this because I looked it up afterward and it matches with what nafterclifen said. The type of reader was just some little toy advanced auto handed me and told me to go plug it in. I think on my way home i'll be able to pass a dealership and see if they're scanner identifies the same one, and to double check which code it is.
If you have an android device buy an Elm obd II adapter from amazon for $10 and then download Torque. You'll be able to read codes and live sensor info. If you don't have an android buy a cheaper reader from amazon for $15. Post the codes here. I suggest Denso o2 sensors. Rockauto has them.

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post #8 of 20 Old 01-29-2019, 10:27 PM Thread Starter
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Quote:
Originally Posted by Vibe View Post
If you have an android device buy an Elm obd II adapter from amazon for $10 and then download Torque. You'll be able to read codes and live sensor info. If you don't have an android buy a cheaper reader from amazon for $15. Post the codes here. I suggest Denso o2 sensors. Rockauto has them.

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Wow, I didn't know that was something you could buy so cheaply! I am outrageously excited about that. I'll check back with codes after my 2-day prime shipping
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post #9 of 20 Old 01-30-2019, 06:07 AM
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Quote:
Originally Posted by mad-dogg View Post
Wow, I didn't know that was something you could buy so cheaply! I am outrageously excited about that. I'll check back with codes after my 2-day prime shipping
It you're doing the Torque option I suggest spending the $5 for Torque Pro.

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post #10 of 20 Old 01-30-2019, 06:31 AM
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Six yrs old and 65K is throwing O2 sensor codes? That should be somewhat concerning.
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post #11 of 20 Old 01-30-2019, 06:40 AM
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Originally Posted by chuckoff View Post
Six yrs old and 65K is throwing O2 sensor codes? That should be somewhat concerning.
We need the codes to know the actual issue. If it's the CAT it's possible it's still under warranty.

My front O2 sensor on my Vibe failed at 3 years/ 90k.. (All highway miles) It happens!

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2001 Chevy Prizm, 1zz-fe, Auto, 132k.(3/2/2019)
I'll UNSUB if you don't have a detailed Sig. & Loc.

Last edited by Vibe; 01-30-2019 at 10:17 AM.
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post #12 of 20 Old 01-30-2019, 08:52 AM
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mad-dogg, check your PM. I sent you some additional info that should help.
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post #13 of 20 Old 01-30-2019, 10:14 AM
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Quote:
Originally Posted by chuckoff View Post
Six yrs old and 65K is throwing O2 sensor codes? That should be somewhat concerning.

I am guessing wiring based on his location in Colorado.


Snow control and rodents both seem likely.

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post #14 of 20 Old 01-31-2019, 06:56 PM Thread Starter
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Man, I hope its not something worse than the 02 sensor. So I got the aforementioned blue tooth obd 2 sensor and its the dang coolest thing I've ever seen. I'm getting some codes that I'm having a hard time understanding. I'm just going to dump everything down here without making any guesses because I'll be wrong.


Test report:
------------------
MID:$01 TID:$91
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$93
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$94
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$95
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$96
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$02 TID:$07
Minimum sensor Voltage for test cycle(calculated) - O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$02 TID:$08
Maximum sensor Voltage for test cycle(calculated) - O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$02 TID:$8b
- O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$02 TID:$8d
- O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$02 TID:$8f
- O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$01 TID:$91
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$93
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$94
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$95
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$96
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$02 TID:$07
Minimum sensor Voltage for test cycle(calculated) - O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$02 TID:$08
Maximum sensor Voltage for test cycle(calculated) - O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$02 TID:$8b
- O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$02 TID:$8d
- O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$02 TID:$8f
- O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
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post #15 of 20 Old 01-31-2019, 07:00 PM Thread Starter
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Part 2:
So I asked the phone to spit out O2 readings and this is what I saw. Bank 1 sensor 2 (the one i though was dead) was showing this nice graph. while bank 1 sensor 1 didnt show anything. Could the front one be the real issue?
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