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I have an '05 Pilot with 225K miles on it. I'm getting P0139 "O2 Sensor Circuit Slow Response Bank 1 Sensor 2." I do not want to put money into replacing my downstream sensor if it won't affect performance or cause issues for my catalytic converter. We don't have emissions inspections in my state. Will anything happen if I don't replace it?
 

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O2 sensors affect fuel air ratios. So it's important to replace if it needs it.
Other possible cause is a cracked air intake tube. It is common for a vehicle this age to have this happen when changing the air filter. It's often on the bottom or where it clamps and you can't see it without examining closely.
 
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I had P0159 a few months ago(same code but for bank2 sensor2)
If you don't replace it you'll get low gas mileage and you can smell unburnt gas through your exhaust. The part is around $50 and pretty easy to replace with proper tools, it'll pay for itself over time.
 

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Without the O2 sensor the computer can't properly trim fuel and likely resorts to "basemaps" on the richer side (thus the poor MPG). Not to mention, unburned fuel will cause the Catalytic Converts to get excessively hot and cause it to wear/fail faster. As for brand, stick with Denso or NTK, which you can get a great price on from RockAuto. As it's Sensor 2 (Downstream) the replacement is only $33.79 (Denso), or 39.79 (NTK), before tax/shipping that if you use the code here can take 5% off your entire order.
 

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Without the O2 sensor the computer can't properly trim fuel and likely resorts to "basemaps" on the richer side (thus the poor MPG). Not to mention, unburned fuel will cause the Catalytic Converts to get excessively hot and cause it to wear/fail faster. As for brand, stick with Denso or NTK, which you can get a great price on from RockAuto. As it's Sensor 2 (Downstream) the replacement is only $33.79 (Denso), or 39.79 (NTK), before tax/shipping that if you use the code here and take 5% off your entire order.
👍 yes, go Denso on the O2 sensor brand. All else is fail.
 

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👍 yes, go Denso on the O2 sensor brand. All else is fail.
NTK/NGK are the same company and should also have great results with, best advise is to replace with same brand as what is taken out, will be one of those two on a Honda, and all other brands should be avoided (unless you really are feeling lucky, at which point be better off visiting a casino).
 

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NTK/NGK are the same company and should also have great results with, best advise is to replace with same brand as what is taken out, will be one of those two on a Honda, and all other brands should be avoided (unless you really are feeling lucky, at which point be better off visiting a casino).
Backed into a corner at AutoZone, I bought a Bosch ($120). Only lasted 25k miles. I knew better, and got burned.
 
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Other possible cause is a cracked air intake tube. It is common for a vehicle this age to have this happen when changing the air filter. It's often on the bottom or where it clamps and you can't see it without examining closely.
Click here to see crack. :)

It can sometimes happen when people bend the old air intake hose a little much. :)

https://d2n97g4vasjwsk.cloudfront.net/2006 Honda Pilot EX 3.5L V6/Air Filter Engine - Part 1 - 480p.mp4


The job should be pretty much like this so-so video, if you need to replace it. As much as I like duct tape solutions, just replace it since it's relatively inexpensive and easy.

 

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Saved the picture of the crack for future reference.
Me, too. Just bought a Western Digital 14TB HDD for just such contingencies going forward. Every couple of years I go big on a new HDD and think, "This should last me for a good while." Then it gets filled up and it doesn't. :)
 

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Me, too. Just bought a Western Digital 14TB HDD for just such contingencies going forward. Every couple of years I go big on a new HDD and think, "This should last me for a good while." Then it gets filled up and it doesn't. :)
It's good to upgrade every now and then.
Where my box of 💾?
 

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It's good to upgrade every now and then.
Where my box of 💾?
With your Fin du Monde craft beer in my RockAuto magnet bedazzled garage fridge that's next to the Aisin TB belt which is waiting for you. :)
 

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With your Fin du Monde craft beer in my RockAuto magnet bedazzled garage fridge that's next to the Aisin TB belt which is waiting for you. :)
Hopefully OP will let us know if their intake tube was cracked or not. It be nice to have more photos of examples of this.
 
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