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I was wondering if anyone have a helms manual and help me locate this o2 sensor. is this the one right under the intake manifold by the firewall or is it the one right out of the header in front of the car. any help is appreciated

It's the one out front by the header.. It's technical name is the Upstream Heated Oxygen Sensor.

Chapter 6, page 6-18, Haynes Repair Manual.

Good luck.

On the 1MZFE bank 1 sensor 1 is the O2 sensor on the exhaust manifold between the engine and firewall. Bank 2 sensor 1 is the one on the exhaust manifold towards the front of the car.

Paladin06Greg wrote:It's the one out front by the header.. It's technical name is the Upstream Heated Oxygen Sensor.

Chapter 6, page 6-18, Haynes Repair Manual.

Good luck.

Hummm, is my book wrong??

Vampire wrote:On the 1MZFE bank 1 sensor 1 is the O2 sensor on the exhaust manifold between the engine and firewall. Bank 2 sensor 1 is the one on the exhaust manifold towards the front of the car.

Paladin06Greg wrote:It's the one out front by the header.. It's technical name is the Upstream Heated Oxygen Sensor.

Chapter 6, page 6-18, Haynes Repair Manual.

Good luck.

Had to replace my rear bank upstream oxygen sensor and that was bank 1 according to the scan tool.