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Thought this may help others as others have helped me out on this forum.
Lexus 2007 -2012 Air/Fuel (A/F) and Oxygen (O2) Sensor Guide
Cjet, thanks for you post!
I just replaced the bank 2, #2 O2 sensor on a 2012 ES 350 and it was straight forward.
The electrical connector was a little tough, but I used a small pick tool to unlatch the "hook" part of the the female connector and it pulled apart. After disconnecting the electrical connector, I drove the car around the block to heat up the sensor threads, and the sensor broke loose easily.
The Denso part came with a small pack of anti-seize which was more than enough.
I'm just about to do this. Did you have to jack up the car to get at the sensor? Did you have to remove the plastic cover underneath the front of the car?
I'm just about to do this. Did you have to jack up the car to get at the sensor? Did you have to remove the plastic cover underneath the front of the car?
Thanks,
Lifting the front end up should make it easier to access the bank 2, #2 sensor. I drove my car up on car ramps that are not very tall.
I removed the plastic cover underneath for easier access. However, I only removed the driver's side half of the cover - I did not fully remove the passenger side of the plastic cover, but I did remove a couple of fasteners from the passenger side - all for easier access to the sensor.
Lifting the front end up should make it easier to access the bank 2, #2 sensor. I drove my car up on car ramps that are not very tall.
I removed the plastic cover underneath for easier access. However, I only removed the driver's side half of the cover - I did not fully remove the passenger side of the plastic cover, but I did remove a couple of fasteners from the passenger side - all for easier access to the sensor.
Good luck! Mine took about an hour.
It's done! Worst part was getting the cover back on. Thanks for the tip about driving it around to heat things up. Couldn't budge the sensor until I did that. Once I got it cracked then it came out easily.
Do have another problem though. Since I had the car up on ramps with the parking brake engaged, it is now stuck on. Doh!
Glad to hear it worked out for you! Good tip to drive it first to warm it up to break the sensors loose easier!
Originally Posted by lexus997
Cjet, thanks for you post!
I just replaced the bank 2, #2 O2 sensor on a 2012 ES 350 and it was straight forward.
The electrical connector was a little tough, but I used a small pick tool to unlatch the "hook" part of the the female connector and it pulled apart. After disconnecting the electrical connector, I drove the car around the block to heat up the sensor threads, and the sensor broke loose easily.
The Denso part came with a small pack of anti-seize which was more than enough.
Super helpful explanation, 08 My gs350 was diagnosed with code p0131 & p0134 which says on the paper Bank 1 sensor 2 & Bank 2 sensor 2 So the tech advisor told me to change both oxygen sensor downstream ? I changed them today so my question is that suppose to be downstram or up steam I’m really confused ? Thanks in advance
Originally Posted by Cjet
Thought this may help others as others have helped me out on this forum.
Lexus 2007 -2012 Air/Fuel (A/F) and Oxygen (O2) Sensor Guide
This bulletin contains information that identifies engine bank 1 and engine bank 2 on
the following engines: 2GR–FE, 2GR–FSE, 4GR–FSE, 2JZ–GE, 1MZ–FE, 3MZ–FE,
1UR–FSE, 3UR–FE, 1UZ–FE, 2UZ–FE, and 3UZ–FE.
TERMINOLOGY:
�� Bank 1 (B1) refers to the bank that includes cylinder No. 1.
�� Bank 2 (B2) refers to the bank opposite bank 1.
�� Sensor 1 (S1) refers to the sensor that is located before the catalytic converters.
�� Sensor 2 (S2) refers to the sensor that is located after the catalytic converters.
Terminology Continued ---
There are a total of 4 oxygen TYPE sensors. TECHNICALLY, they are:
(2) Air/Fuel (A/F) sensors located on the exhaust manifold, 1 per bank. Also called “Upstream”.
(2) Oxygen (O2) sensors located AFTER the engine mounted catalytic converters, 1 per bank. Also called “Downstream”.
Bank 1 (B1) is located nearest the firewall. Also called “Right”.
Bank 2 (B2) is front of engine, also called “Left”.
Ex. If you need to replace the Bank 2, Sensor 2, you would look for an O2 sensor, B2S2, Downstream, Left.
If you need to replace Bank 1, Sensor 1, you would look for an A/F sensor, Upstream, Right. B1S1, OR (see note below) look for an O2 sensor, Upstream, Right.
Note: When looking for replacement parts, be aware that the term “oxygen sensor” or “02 sensor” is a broad term used by some part companies to also describe the “air fuel sensor”, so double check the part. “Upstream” for the ES-350 means an Air Fuel A/F sensor, though some companies will call it an O2 sensor.
Thought this may help others as others have helped me out on this forum.
Lexus 2007 -2012 Air/Fuel (A/F) and Oxygen (O2) Sensor Guide
This bulletin contains information that identifies engine bank 1 and engine bank 2 on
the following engines: 2GR–FE, 2GR–FSE, 4GR–FSE, 2JZ–GE, 1MZ–FE, 3MZ–FE,
1UR–FSE, 3UR–FE, 1UZ–FE, 2UZ–FE, and 3UZ–FE.
TERMINOLOGY:
�� Bank 1 (B1) refers to the bank that includes cylinder No. 1.
�� Bank 2 (B2) refers to the bank opposite bank 1.
�� Sensor 1 (S1) refers to the sensor that is located before the catalytic converters.
�� Sensor 2 (S2) refers to the sensor that is located after the catalytic converters.
Terminology Continued ---
There are a total of 4 oxygen TYPE sensors. TECHNICALLY, they are:
(2) Air/Fuel (A/F) sensors located on the exhaust manifold, 1 per bank. Also called “Upstream”.
(2) Oxygen (O2) sensors located AFTER the engine mounted catalytic converters, 1 per bank. Also called “Downstream”.
Bank 1 (B1) is located nearest the firewall. Also called “Right”.
Bank 2 (B2) is front of engine, also called “Left”.
Ex. If you need to replace the Bank 2, Sensor 2, you would look for an O2 sensor, B2S2, Downstream, Left.
If you need to replace Bank 1, Sensor 1, you would look for an A/F sensor, Upstream, Right. B1S1, OR (see note below) look for an O2 sensor, Upstream, Right.
Note: When looking for replacement parts, be aware that the term “oxygen sensor” or “02 sensor” is a broad term used by some part companies to also describe the “air fuel sensor”, so double check the part. “Upstream” for the ES-350 means an Air Fuel A/F sensor, though some companies will call it an O2 sensor.
Hi I need help i want pictures of af and o2 do they look the same i found some with 1 hole and others with 4 holes i dont know which to purchase
11-14-21, 07:59 AM
