My check engine light is on and it’s throwing two codes, P0135 (bank 1 sensor 1) and P0155 (bank 2 sensor 1). It is my understanding that I need to replace these sensors but I am not sure which sensors to purchase. I want to buy Denso but am not sure if these are considered upstream or downstream. Can someone advise of the Denso part numbers needed to replace these sensors? Thanks
Check Engine Light
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Have you check the fuse to make sure the sensors are getting power to their heater circuits?
www.densoautoparts.com
Part Details | DENSO Auto Parts
Part Info Back to Search Results New Search Air / Fuel Ratio Sensor 234-9021 Note: The product images shown are for illustration purposes only and may not be an exact representation of the product. DENSO reserves the right to change product images and specifications at any time without notice...
www.densoautoparts.com
Are you telling me both sensors use the same part and are “upstream”?Part Details | DENSO Auto Parts
Part Info Back to Search Results New Search Air / Fuel Ratio Sensor 234-9021 Note: The product images shown are for illustration purposes only and may not be an exact representation of the product. DENSO reserves the right to change product images and specifications at any time without notice...
Sensor 1 is always upstream! And in this case they are the same! Check the fuse first!
Great, thanks for confirming. Before I start Googling about the fuse can you provide any insight on the fuse and location?
Engine compartment fuse box!
Thanks for your help!
To be clear, there are two upstream O2 sensors, and 1 downstream sensor on the 1MZ-FE. The two Toyota branded sensors are different, have different part numbers, and the difference is that the cable on the Bank 2 sensor is 2" longer than the Bank 1 sensor cable.
On a Gen 2 Avalon, Toyota 89467-41030 is the rear (Bank 1) sensor part number, and Toyota 89467-41040 is the front (Bank 2) sensor part number. If you want to save a little money, you can buy a Denso 234-9041 for EITHER bank. Denso is the OEM for the Toyota sensors. Do not use any sensors other than Toyota or Denso.
On a Gen 2 Avalon, Toyota 89467-41030 is the rear (Bank 1) sensor part number, and Toyota 89467-41040 is the front (Bank 2) sensor part number. If you want to save a little money, you can buy a Denso 234-9041 for EITHER bank. Denso is the OEM for the Toyota sensors. Do not use any sensors other than Toyota or Denso.
Thank you for the information, good to know!
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Unless you can guarantee the DENSO sensors are a direct replacement, use OEM
Toyota sensors are the fussiest I have ever seen, aftermarkets rarely work, I have used DENSO when I have been able to get a DENSO number off the OEM part.
If your scanner has graphing abilities you can look at the upstream and downstream data and see what they look like.
Toyota sensors are the fussiest I have ever seen, aftermarkets rarely work, I have used DENSO when I have been able to get a DENSO number off the OEM part.
If your scanner has graphing abilities you can look at the upstream and downstream data and see what they look like.
Unfortunately, I don’t have graphing abilities on my scanner. Thank you for the advice!
I thought Toyota sensors are make by Denso, since Denso is part of Toyota Group! 😁
And both P0135 and P0155 are for the heater circuits of the sensors, doubt very much it will show on the data, except maybe watching how fast they go into Close Loop!
Just saying!
And both P0135 and P0155 are for the heater circuits of the sensors, doubt very much it will show on the data, except maybe watching how fast they go into Close Loop!
Just saying!
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