I get these error codes for Bank 1 Sensor 2 o2 sensors, where are they located?
Where are sensor 1 and 3 located?
I have 130,000 km on the truck so I think it is time to replace the sensors anyways.
Thanks

 

I put up 2 images (attachements).
The engine one is bank 1 sensor 2
The image of just the exhaust is bank 2 sensor 1

[IMG]local://upfiles/7850/159ECCDBAF8D4D198D21BB6B70FCABF1.jpg[/IMG]

[IMG]local://upfiles/7850/871FF8C00C1942188A8C0E643A987110.jpg[/IMG]

 

Sorry about the images not being clear.
This is what each code means;
P0138= HO2S circuit high voltage
P0140= HO2S circuit insufficient activity

Here's a better image of where which sensor is where;



[IMG]local://upfiles/7850/33E9AF64268147B0B3E14D2B71C12B3B.jpg[/IMG]

 

Oh yeah,

According to the shop manual,
P0138 is either Bank 1 Sensor 2 or Bank 2 Sensor 2
It's the same sensors for P0140

In case you were wondering,
P0131 or P0132would be forBank 1 Sensor 1 and Bank 2 Sensor 1

Hope this helps