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 Post subject: 02 sensors
PostPosted: Fri Aug 08, 2008 2:51 pm 
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How hard is it to remove the 02 sensors. Being in the exhaust pipe I would think rust, heat and corrosion would make very hard.


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 Post subject: Re: 02 sensors
PostPosted: Fri Aug 08, 2008 2:54 pm 
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i've never had a problem. The 02 sensor socket makes it a lot easier (has a slot for the wire)


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 Post subject: Re: 02 sensors
PostPosted: Fri Aug 08, 2008 2:57 pm 
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Thanks for the come back . I guess I will do it myself. By the way are sockets readly avilable?


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 Post subject: Re: 02 sensors
PostPosted: Fri Aug 08, 2008 3:20 pm 
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I've found that it's somewhat easier if you have things warmed up first. Not 3 hour trip hotter than the hubs of heII hot!

Plus, I will often use some PB blaster at least a 1/2 hour before attempting removal, if I have time.

O2 sensor sockets can be readily obtained at local parts stores, including at Harbor Freight of all places.

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 Post subject: Re: 02 sensors
PostPosted: Fri Aug 08, 2008 3:25 pm 
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yeah, i can't remember if i got mine at checker, or maybe autozone. one of your local parts shops should have it.


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 Post subject: Re: 02 sensors
PostPosted: Fri Aug 08, 2008 5:15 pm 
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And just in case you don't already know...you only need to replace one, the upstream sensor, every 100k. The second is there to indicate the functionality of the catalyst.

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Now: '15 Toyota Prius III | 134 hp 2ZR-FXE | Silver | 36k
Now: '03 Honda CR-V AWD | Slow 4-Cylinder | Dirt | 180k

Then: '07 Ford Fusion SEL | 221hp Gen I VVT Duratec 3.0 V6 | Tungsten Silver | 150k
Then: '99 Toyota Avalon XL | 200hp 1MZ-FE 3.0 V6 | Diamond White | 189k | Sold: July 2015
Then: '11 Ford Fusion SEL | 240hp Gen II VVT Duratec 3.0 V6 | Ingot Silver | 84k | Totaled: Oct 23 '14 (Rear-Ended)
Then: '96 Buick Park Avenue Ultra | 240hp Series II L67 | Medium Dark Lichen | Bought: JAN 11 @ 135k | Accident: FEB 3 '12 | Crushed: MAR 1 '13 @ 153K
Then: '98 Pontiac Bonneville SSE | 205hp Series II 3800 L36 | Topaz Firemist | Bought: NOV '09 @ 74k | Accident: MAY 28 '10 | Crushed: MAR 15 '11 @ 84k
Then: '93 Pontiac Bonneville SE | 170hp Series I 3800 L27 | Dark Yellow Green | Bought: JULY '07 @ 92k | Sold: JULY '12 @ 118k
Then: '89 Pontiac Bonneville LE | 165hp 3800 LN3 | Medium Garnet Red | Bought: JAN '05 @ 117k | Sold: SEP 30 '07 @ 152k


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 Post subject: Re: 02 sensors
PostPosted: Fri Aug 08, 2008 5:34 pm 
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I have heard the one by the catalytic conferter is the one that affects gas milage if it is bad.
When you talk about the one up stream is that the one up by the engine?


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 Post subject: Re: 02 sensors
PostPosted: Fri Aug 08, 2008 5:54 pm 
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Yes, the upstream sensor is the one that you want to change. That is the one located just under the firewall, directly back from the rear bank's manifold, before the catalytic converter. The one after it does not need to be changed unless it is malfunctioning. If you get a code for Bank 1, Sensor 2, the downstream sensor, this is indicating that the catalytic converter is no longer functioning as it was designed to, and must be replaced. If not replaced, will eventually clog.

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Now: '15 Toyota Prius III | 134 hp 2ZR-FXE | Silver | 36k
Now: '03 Honda CR-V AWD | Slow 4-Cylinder | Dirt | 180k

Then: '07 Ford Fusion SEL | 221hp Gen I VVT Duratec 3.0 V6 | Tungsten Silver | 150k
Then: '99 Toyota Avalon XL | 200hp 1MZ-FE 3.0 V6 | Diamond White | 189k | Sold: July 2015
Then: '11 Ford Fusion SEL | 240hp Gen II VVT Duratec 3.0 V6 | Ingot Silver | 84k | Totaled: Oct 23 '14 (Rear-Ended)
Then: '96 Buick Park Avenue Ultra | 240hp Series II L67 | Medium Dark Lichen | Bought: JAN 11 @ 135k | Accident: FEB 3 '12 | Crushed: MAR 1 '13 @ 153K
Then: '98 Pontiac Bonneville SSE | 205hp Series II 3800 L36 | Topaz Firemist | Bought: NOV '09 @ 74k | Accident: MAY 28 '10 | Crushed: MAR 15 '11 @ 84k
Then: '93 Pontiac Bonneville SE | 170hp Series I 3800 L27 | Dark Yellow Green | Bought: JULY '07 @ 92k | Sold: JULY '12 @ 118k
Then: '89 Pontiac Bonneville LE | 165hp 3800 LN3 | Medium Garnet Red | Bought: JAN '05 @ 117k | Sold: SEP 30 '07 @ 152k


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 Post subject: Re: 02 sensors
PostPosted: Fri Aug 08, 2008 10:47 pm 
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yup. the first one makes the adjustments, the second one after the cat is just the last sensor in the system, making sure everything else was working fine.


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