Aurion O2 Sensors - replace all at once?

[tom717]

My 150k 2008 Aurion check engine light has come on. My code scanner says bank 2 Oxygen sensor. This is the front one I believe.

I intend to swap it with a new one.

There's another one on the rear bank, and one post catalytic converter.

 

Do people change them all in one hit if they start failing? Or one at a time?

 

The front one looks easy to access. What about the others? Are they hard to get to?

[campbeam]

What is the error code? I understand that the 2 pre-cat sensors are air/fuel ratio sensors and the 2 post cat sensors are O2 sensors.

I have removed and cleaned only the front air/fuel ratio sensor and both of the post-cat O2 sensors. The other air/fuel pre-cat sensor [located at the back near the firewall] is tucked away out of sight so I have not yet touched it or located the electrcal connector.

Personally, I would be inclined to clean the sensors first then replace them if the check engine still stays on.

I bought the following 3 piece socket set on eBay which was useful plus I also ended up using a 24mm ring spanner as well. A tip I picked up from internet searches was to use brake fluid to loosen the sensor if WD40 does not work. Remember to use sparingly some anti-seize on the sensor threads when retightening.

https://www.ebay.com.au/itm/3-Pc-Oxygen-Sensor-Socket-Wrench-O2-Tool-Set-Auto/291411775618?hash=item43d97ed082:g:Uk8AAOSwhQhY1hoa

 

[tom717]

The code was P0051

I replaced the sensor with a new Denso sensor. The error code has gone away now.

The front sensor is a fairly easy swap over.

[krigeroz]

10 hours ago, tom717 said:

The code was P0051

I replaced the sensor with a new Denso sensor. The error code has gone away now.

The front sensor is a fairly easy swap over.

From where did you get the sensor, and what was the cost?

[tom717]

I bought it on ebay. it was $220. 

There were also cheaper aftermarket ones.

 

Toyota wanted $380 for the sensor and $700 installed.

Edited May 23, 2018 by tom717

[matt36415]

Out of interest, how do you clean an o2 sensor

[campbeam]

After removing the O2 sensor, spray the lower body with either carb/throttle body cleaner or brake cleaner. Then wipe the sensor. Repeat if necessary.

Somewhat similar to cleaning a spark plug.