Question about O2 sensors.
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Junior Member
Joined: Jan 2019
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From: Alabama
Question about O2 sensors.
I have a 2001 Mazda Tribute LX V6 3.0L.
Is bank 1 sensor 2 considered upstream or downstream or are they interchangeable on this model?
I'm trying to order the correct part.
Thanks in advance.
Is bank 1 sensor 2 considered upstream or downstream or are they interchangeable on this model?
I'm trying to order the correct part.
Thanks in advance.
Senior Member
Joined: Dec 2016
Posts: 232
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From: Auckland
AFAIK (and on my 2001 V6), there are only upstream (ie pre-catalyst), O2 sensors fitted, so the O2 are used to trim the fuel injection but cannot tell the car how well (or not) the cats are working...the sensors are in the top of the manifolds where the 3 header pipes join, above the cat bulge in the downpipes.
Thread Starter
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Junior Member
Joined: Jan 2019
Posts: 6
Likes: 0
From: Alabama
Question about O2 sensors.
AFAIK (and on my 2001 V6), there are only upstream (ie pre-catalyst), O2 sensors fitted, so the O2 are used to trim the fuel injection but cannot tell the car how well (or not) the cats are working...the sensors are in the top of the manifolds where the 3 header pipes join, above the cat bulge in the downpipes.
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From: Queensland Australia
There should be 2 x A/F( air / fuel ) sensors ( pre cat ) & 2 x 02 (oxygen ) sensors (post cat ) in the exhaust of the V6. ------ Cat = catalytic convertor.
Bank 1 sensor 1 is the front bank A/F sensor
Bank 1 sensor 2 is the front bank post-cat O2 sensor
Bank 2 sensor 1 is the rear bank bank A/F sensor
Bank 2 sensor 2 is the rear bank post cat O2 sensor
Bank 1 sensor 1 is the front bank A/F sensor
Bank 1 sensor 2 is the front bank post-cat O2 sensor
Bank 2 sensor 1 is the rear bank bank A/F sensor
Bank 2 sensor 2 is the rear bank post cat O2 sensor
Last edited by grim_reaper; Feb 3, 2019 at 04:42 AM.
Thread Starter
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Junior Member
Joined: Jan 2019
Posts: 6
Likes: 0
From: Alabama
Question about O2 sensors.
There should be 2 x A/F( air / fuel ) sensors ( pre cat ) & 2 x 02 (oxygen ) sensors (post cat ) in the exhaust of the V6. ------ Cat = catalytic convertor.
Bank 1 sensor 1 is the front bank A/F sensor
Bank 1 sensor 2 is the front bank post-cat O2 sensor
Bank 2 sensor 1 is the rear bank bank A/F sensor
Bank 2 sensor 2 is the rear bank post cat O2 sensor
Bank 1 sensor 1 is the front bank A/F sensor
Bank 1 sensor 2 is the front bank post-cat O2 sensor
Bank 2 sensor 1 is the rear bank bank A/F sensor
Bank 2 sensor 2 is the rear bank post cat O2 sensor
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Joined: Dec 2016
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From: Auckland
If you look under the front of the engine where the front manifold pipe goes horizontally towards the right wherl, if you have the after-cat sensors one will be there.
Our 2001 and 2002 V6’s dont have them but if yours does the “sensor 2” or downstream sensor will be there. Those between the cylinders and cat are upstream, those after the cat are downstream, think fishing from a bridge (the cat), upstream and downstream would be as you refer to the direction from the bridge.
Our 2001 and 2002 V6’s dont have them but if yours does the “sensor 2” or downstream sensor will be there. Those between the cylinders and cat are upstream, those after the cat are downstream, think fishing from a bridge (the cat), upstream and downstream would be as you refer to the direction from the bridge.
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Junior Member
Joined: Jan 2019
Posts: 6
Likes: 0
From: Alabama
Question about O2 sensors.
If you look under the front of the engine where the front manifold pipe goes horizontally towards the right wherl, if you have the after-cat sensors one will be there.
Our 2001 and 2002 V6’s dont have them but if yours does the “sensor 2” or downstream sensor will be there. Those between the cylinders and cat are upstream, those after the cat are downstream, think fishing from a bridge (the cat), upstream and downstream would be as you refer to the direction from the bridge.
Our 2001 and 2002 V6’s dont have them but if yours does the “sensor 2” or downstream sensor will be there. Those between the cylinders and cat are upstream, those after the cat are downstream, think fishing from a bridge (the cat), upstream and downstream would be as you refer to the direction from the bridge.
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