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I need to know how to locate the upstream and downstream o2 sensors on my 1996 ford explorer xlt 4x4 4.0 liter v6 automatic w/ a/c

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They are screwed into the exhaust sytem Upstream sensors are before the cat convertors and the downstream are after the cat convertor

Posted on Mar 16, 2011

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Did you get them codes read? if so whoever did it should be able to locat them ,,,,,,,,,if not Auto Zone or any parts store can show you on computor in store and run a code scan for free

Posted on Mar 16, 2011

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Can someone give a diagram location of up and downstream 02 sensors on 2003 ford expedition?


The upstream O2 sensors are just off the engine exhaust manifolds, the downstream sensor is located aft of the catalytic converter, it is not called an O2 sensor it is referred to as the catalyst efficiency monitor.

May 04, 2017 | Ford Cars & Trucks

2 Answers

I have a 2004 ford explorer xlt v6 4.0l gas. need a o2 sensor diagram. I need names and description. for example bank 1 sensor 2 after catalytic converter


https://www.google.com/search?q=1998+BMW+318i+Automatic+Torque+settings+Head+gasket&biw=1360&bih=650&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwie8o3ix8_QAhUJRSYKHdIXBrkQsAQIKQ#tbm=isch&q=2004+ford+explorer+xlt+v6+engine+firing+order

Hope this helps

Bank two are the even cylinders. Follow exhaust manifold on the side. You will find an O2 sensor just after or on the manifold, before the catalytic converter. Then, look after the catalytic and you should find another O2 sensor, this is the one you mention in your post.

Nov 30, 2016 | 2004 Ford Explorer XLT

1 Answer

Where is the oxygen sensor on 06 ford explorer v6


Explorer requires 4 O2 sensors in total. Two are upstream, i.e. above the catalytic converter and two are downstream i.e. below catalytic converter. Simply locate these sensors by following the exhaust line from the engine towards the catalytic converter and after it.

Apr 14, 2013 | 1997 Mercury Cougar XR7

1 Answer

How many oxygen sensors are there on a 1996 ford explorer 8 cyl., 4.0 eng.


The answer depends on the type of exhaust system you have. You will have either 3 or 4 total O2 sensors on your V8. If you have single exhaust with a single catalytic converter then you will have 3 O2 sensors (2 upstream sensors & one downstream sensor - "up or down stream" meaning before of after the catalytic converter). If you have either dual exhaust and/or two catalytic converters then you have 4 O2 sensors (2 upstream & 2 downstream). If you have an MIL light (malfunction indicator light, or "check engine light") the code will indicate "front bank / bank one", which is one of the 2 upstream O2's before the catalytic converter(s), or "rear bank / bank two", which is one of the O2's after the catalytic converter(s).

Apr 22, 2012 | 1996 Ford Explorer

2 Answers

O2 sensor type and location for 3.8 liter engine


there are 4 o2 sensors the 2 up towards the engine are called the upstream and the 2 after the converters are called the downstream . heres a picture to help you understand there locations. hope this helpsonetufshoppe_121.gif

Feb 12, 2011 | 1998 Ford Windstar

1 Answer

03 santa fe code p0421 for warm up catalyst below bank 1is it converter sensors whats bank 1 converter location compared to bank 2 is there 2 banks or converters would it be upstream or downstream if it...


If the engine is a V6 (2.7 or 3.5 lit), bank 1 is next to the firewall (right hand) when facing the back of the engine.
If the engine is a 4 cly (I4), there is only one bank and is designated Bank 1 (exhaust manifold).

The catalyst to which the code refers is the UPSTREAM, and there is only ONE upstream cat for any bank.

Clue: Two upstream O2 sensor and two downstream O2 sensors - one before the CAT and one after the CAT. the downstream O2 sensors are identical to their upstream sisters. The only reason for the DOWNstream sensor is to monitor the CAT efficiency (threshold).

The catalyst on either bank is essentially the exhaust manifold which houses the CAT... it is the only CAT to which the code P0421 applies.

Hope that helped

Feb 06, 2011 | Hyundai Santa Fe Cars & Trucks

3 Answers

Code po430 not sure what maybe converter


One of three (3) possibitlies:
1. Catalytic Converter is malfunctioning.
2. O2 Sensor is malfunctioning. This will be the O2 Sensor located on the Catalytic Converter. However you should check and/or replace both sensors if needed.
3. You have an Exhaust Leak.
In Order of checking:
A. Check and Repair any Exhaust Leak.
B. Replace the O2 Sensor on the Catalytic Converter 1st. Also Known as the Downstream O2 Sensor or HO2 Sensor.
C. Replace the O2 on the Exhaust Manifold prior to the Catalytic Converter. Also Known as the Upstream O2 Sensor.
D. Replace the Catalytic Converter.
Let me know if this helped, or if you have any additional information, problems or questions. Feel free to contact me at FixYa.com!

Feb 01, 2010 | 1998 Ford Explorer

2 Answers

Exact location of downstream O2 sensor.


Downstream O2 sensor is after (downstream) the catalitic converter on the exhaust pipe. Upstream O2 sensor is after (downstream) the engine exhaust manifold - before (upstream) the catalitic converter. Upstream O2 sensor controls air-to-fuel ratio to yield a small excess oxygen. Downstream O2 sensor assesses the catalitic converter performance.

Sep 22, 2009 | 2003 Pontiac Vibe

1 Answer

Replace oxygen sensors


these engines have 1 upstream o2 sensor and 1 downstream o2 sensor..the 1 in the rear exhaust manifold is the upstream and the 1 after the converter is the downstream..make sure you replaced the right one

May 15, 2009 | 1998 Plymouth Grand Voyager

1 Answer

1997 Dodge Stratus V6 oxygen sensor location


Upstream, as in ahead of the converter, back toward engine. Start at converter and work your way back, should be on exhaust pipe or even on manifold.

Jan 11, 2009 | 1996 Nissan 240SX

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