2007-2011 Toyota Camry V6 (GSV40) Secodary O2 λ Sensor Locations and Exhaust Layout

This is more about what to expect under the Car...

iFixit Library 2007-2011 Toyota Camry Easy No estimate Guide 246038

Licensed iFixit integration

This attributed iFixit guide is displayed through Fixonic's recorded commercial API permission. iFixit remains the independent source and author of the procedure.

Guide overview

Before you begin

This is more about what to expect under the Car than a specific fix. I could not find any pictures of the Secondary O2 λ Sensor locations or even a view of the underside of the 2GR-FE based V6 Camry (GSV40 ). It should also be noted that the consensus is that replacing secondary O2 λ sensors to fix P0420 or P0430 is unlikely to resolve the issue.

Step 1

Put the car on axle stands

⌕

TOOL USED ON THIS STEP Axle stands Referenced by the iFixit guide

View item

With the parking brake on, put the car on axle stands on level solid ground. Chock the rear wheel,(if you don't have wheel chocks, use a couple of bricks...)
Note: Unlike my old Celica there are no obvious points to put axle stands; you can see where mine were. I am not saying this is the best place; it worked for me.

Step 2

Accessing and working with the Secondary O2 λ sensors.

⌕

TOOL USED ON THIS STEP Brass Wire Brush Referenced by the iFixit guide

View item

Before accessing the O2 sensors you will need to remove the plastic cover (10mm bolts and plastic push connectors?). Mine was already missing!
Unlike the Primary O2 λ sensors, which help the ECU maintain an optimum fuel/air ratio. The Secondary O2 λ sensors' sole purpose is to monitor the performance of the Catalytic converters.
Bank 2 O2 λ Sensor 2 is highlighted in the Blue Square. Monitors for (P0430): there is very little clearance behind this sensor; long tools will foul on the oil pan!
Second Photograph Shows Bank 1 Secondary O2 λ Sensor. 19 years and 200K miles. Bank 2 had been recently replaced and came straight out. I would imagine a blowtorch, a wire brush and a dedicated O2 Wrench will be needed to remove the original Bank 1 sensor.
Third Photograph shows The Secondary O2 λ Sensors connector. The Sensors connectors are Keyed to prevent the banks from getting swapped. The Bottom connector is Bank 1. Squeeze the tab and pull the sensor out by its connector (Because of the space restrictions, I put locking long-nose vise-grips on the sensor connector to remove it)

Step 3

Underside Exhaust Layout

⌕

First photograph shows where the exhaust splits the part that goes straight attaches to bank 2 manifold catalytic converter
The second photograph shows the pipe that loops back going to the bank 1 manifold catalytic converter which you can see the bottom of.
The last photograph shows the exhausts final unmonitored catalytic converter and the muffler going back to where the pipe conects to the Y-Split exhaust