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  #1  
Old 09-04-2006, 08:49 PM
oaknok oaknok is offline
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02 sensor, How hard to replace?

I drive a '95 caprice w/ 125,000 and get horrible gas milage. I've been reading in the forums and I think I might need a new 02 sensor. I've changed the plugs, fuel filter, and it still only gets 10mpg around town. How do I know when to change the 02 sensor and how hard is it to replace? I can do basics like change my oil, transmission fluid, brakes front and back, and my spark plugs, so can I change the 02 myself?
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Old 09-04-2006, 09:09 PM
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Re: 02 sensor, How hard to replace?

Quote:
Originally Posted by oaknok
I drive a '95 caprice w/ 125,000 and get horrible gas milage. I've been reading in the forums and I think I might need a new 02 sensor. I've changed the plugs, fuel filter, and it still only gets 10mpg around town. How do I know when to change the 02 sensor and how hard is it to replace? I can do basics like change my oil, transmission fluid, brakes front and back, and my spark plugs, so can I change the 02 myself?
What engine do you have?

What rear axle ratio do you have?

The EGO sensor is no harder to replace than a spark plug - but don't change it without checking other things too. Do you get the service engine soon light on the dash?
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Old 09-04-2006, 09:14 PM
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Re: 02 sensor, How hard to replace?

I have the L99, I'm not sure on the rear axle ratio, where can I find that info?
oh and the service engine light isn't on.....

edit: BTW my temp. gauge isn't working properly, it stays on the left and only sometimes it reads the correct temp. Would that have anything to do with the mpg I'm getting?
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Old 09-04-2006, 09:38 PM
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Re: 02 sensor, How hard to replace?

Quote:
Originally Posted by oaknok
I have the L99, I'm not sure on the rear axle ratio, where can I find that info?
oh and the service engine light isn't on.....
The L99 is the 4.3 liter, correct? Okay, look on the "Service Parts Identification" label under the deck lid. Look for "Gxx", such as GU4, GX9 etc. My guess is that you have a GM8, which is a 2.56, but I could be wrong.

The smaller engine with the taller ratio around town could cause you to "stomp on it" more than the larger engine, resulting in poor economy.

Since you said the SES light was NOT on, if it smells rich then there is definitely the possibility of an EGO sensor failure. These are typically on the driver's exhaust manifold near the dump.
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Old 09-04-2006, 09:42 PM
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Re: 02 sensor, How hard to replace?

I just checked and it says "GU5"
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  #6  
Old 09-04-2006, 09:43 PM
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Re: 02 sensor, How hard to replace?

Quote:
Originally Posted by oaknok
I just checked and it says "GU5"
GU5 is 3.23 so that's decent, I would suppose to make up power from the smaller engine. It just might be a bad sensor causing the engine to run rich, and not setting the SES light.
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2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness!
1967 El Camino L79/M20 old school asphalt raper

Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have.
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Old 09-05-2006, 07:28 PM
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Re: 02 sensor, How hard to replace?

Could the EGO sensor be the problem why mine runs rich?

I got a duty cycle meter and my M/c duty percent was 58%
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Old 09-05-2006, 07:43 PM
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Re: 02 sensor, How hard to replace?

Quote:
Originally Posted by capriceowns
Could the EGO sensor be the problem why mine runs rich?

I got a duty cycle meter and my M/c duty percent was 58%
It certainly could. It could be reporting a certain value that's off, causing the computer to compensate just enough that the MIL doesn't light.
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2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness!
1967 El Camino L79/M20 old school asphalt raper

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Old 09-05-2006, 08:41 PM
capriceowns capriceowns is offline
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Re: 02 sensor, How hard to replace?

are they real pricey, or can I get one for under 20$?
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Old 09-06-2006, 01:02 AM
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Re: 02 sensor, How hard to replace?

Quote:
Originally Posted by capriceowns
are they real pricey, or can I get one for under 20$?
$19 for a Bosch unit is what I paid for mine at Autozone about 3 years ago. I suspect they'd still be in that ballpark.
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2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness!
1967 El Camino L79/M20 old school asphalt raper

Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have.
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Old 09-06-2006, 01:53 AM
oaknok oaknok is offline
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Re: 02 sensor, How hard to replace?

I just checked prices with autozone and napa and they were $55.99 each
It says I need two, is that true? Does anyone know of any online sites that would be cheaper?
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  #12  
Old 09-06-2006, 06:34 PM
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Re: 02 sensor, How hard to replace?

Try www.RockAuto.com, they seem to have pretty good prices.
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Old 09-06-2006, 11:21 PM
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Re: 02 sensor, How hard to replace?

Do I need two oxygen sensors or just one????
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  #14  
Old 09-06-2006, 11:37 PM
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Re: 02 sensor, How hard to replace?

Quote:
Originally Posted by oaknok
Do I need two oxygen sensors or just one????
What would YOU think?

If one is bad, I'd do 'em both. To attempt to save some $$$ by only doing one is what we call "false economy". You spend less in the long run when you spend more to do it right the first time.
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2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness!
1967 El Camino L79/M20 old school asphalt raper

Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have.
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Old 09-07-2006, 01:16 AM
oaknok oaknok is offline
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Re: 02 sensor, How hard to replace?

Quote:
Originally Posted by silicon212
What would YOU think?

If one is bad, I'd do 'em both. To attempt to save some $$$ by only doing one is what we call "false economy". You spend less in the long run when you spend more to do it right the first time.
I've never replaced these sensors before on a car, I didn't know there was two, atleast now I know how many I need to get.
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