How many o2 sensors?

[aij3]

How many o2 sensors are there on a 2003 Grand Caravan Sport? 3.3l engine. Where is the bank 1 sensor 1 o2 sensor referenced by code p0135 located? Is it that one to the rear of the engine (rear exhaust manifold, really hard to get too it seems) ? I see two of them. The one I mentioned above and the one on the side of the catalytic converter. I thought I read a post somewhere saying that this vehicle has 3 02 sensors? Please correct me if I'm wrong but this is how I understand it: bank 1 sensor 1 is the 02 sensor on the rear manifold? bank 2 sensor refers to the sensor on the side of the catalytic converter? where is the other one if there are 3 of them? Could anyone provide photos or diagrams showing where they are? I have the haynes manual but it only references an upstream and downstream sensors. Thanks.

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[master tech]

There is two. one upsteam and one downsteam.

[aij3]

Hi Master Tech,

Thanks for the reply. Just a quick question on the tool I need. Is there a particular size o2 sensor socket for this particular o2/vehicle?

Could click on the link below and tell me if this would work?

http://www.canadiantire.ca/browse/pr...=1218583623815

Thanks again.

Originally Posted by master tech

There is two. one upsteam and one downsteam.

[master tech]

You can cut off the wire at the o2 sensor and use a 7/8 deep socket or box end wrench. Or a o2 sensor socket tool. Also 7/8 is the same as 22mm.