How to: Install new Upstream O2 Sensors

[deathscort]

ok. I replaced 3. Thats all I seen.

 

[deathscort]

There is one on each mani, and one in between the cats. I got those three. I felt and looked up and down the exhaust for another, but all I have is 3... Can anyone elaborate, or share pictures of the two downstream ones?

 

[SoNic67]

What engine?

 

[deathscort]

4.0 ohv

 

[SoNic67]

Looks like your engine has indeed only three:

Some of us have four, something like below:

 

[deathscort]

Thanks! I was starting to think that I was crazy.

 

[CypherSTL]

I just changed these on mine. Pulled the battery, hooked it back up. Check Engine Light came back on today with 3 codes

Lean Bank 1
Lean Bank 2
Cayalyst Efficiency Low - Bank 1

I used these parts:
Upstream O2 (Both Sides) Bosch #13117
Downstream Bosch #15718

I've had a few different places telling me I have the wrong Downstream sensor on it, one place tells me that the upstreams take two different Model #s depending on which side. Anyone confirm I used the correct parts?

2000 Explorer Sport 4.0 OHV

 

[SoNic67]

They should be the right part. They are not so "specific", same sensors came OE on any Ford Explorer 4.0 OHV/SOHC/5.0L and Ford Taurus 3.0L.
Did you tigthen the upstream ones completelly? Did you force the manifold when you remove the original ones?

 

[esamuel79]

Hey buddy i'm about to get into changinging my o2 sensors but dont know what ones to change i got a code of 300,034,305,306, and a 2198 any ideas ???

 

[SoNic67]

P0300, 0305 and 0306 are missfires. Not related to O2 sensors.

 

[KAESAR]

Thanks

THANKS A LOT FOR THE INFORMATION. Muchas Gracias.

I decided to write this thread because I could not find any posts in the forum about changing the upstream O2 sensors with pictures.

Stats- I have a 2000 Explorer XLS 4WD with the 4.0 OHV. The truck has 138,000 on it and this is the first time the O2 sensors were changed.




Step 1

Tools – I used a jack, jack stand, lug wrench, 7/8” box wrench, PB Blaster, and the O2 sensor kit from Harbor Freight. Look in the latest issues of any four wheel drive magazine for a 20% off coupon for Harbor Freight. Another tool I used not pictured was a breaker bar.

 

[rondon59]

how did you get the wire to plug into the harness wiring Im having trouble getting my hand in there