02-04-2004, 02:41 PM
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#1
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AF Newbie
Join Date: Oct 2003
Posts: 4
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Oxy Sensor/CheckEngineLight/Major gas Problem
I do not have autozone codes handy, the machine is down at the shop for a week or two, but this problem is driving me crazy and costing me a nice amount of money.
98 Contour Sport
99,927 Miles
My check engine light is ON.
I assume it is the Oxy Sensor, though, thats just an assumption.
My gas mileage has gone WAY downhill. I used to use half a tank a week.
Now it is half a tank every 2 days, if im lucky.
I also used to use 89octane, but now with prices so high and my need to refuel so often I use 87.
I was thinking about taking it into the shop, since it probably needs more work (tune up, so on and so forth).
Any ideas?
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02-04-2004, 02:45 PM
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#2
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AF Newbie
Join Date: Oct 2003
Posts: 4
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Re: Oxy Sensor/CheckEngineLight/Major gas Problem
I will actually drive out to a different autozone tonight, and get the codes.
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02-05-2004, 12:53 PM
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#3
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AF Ford Contour-Advisor
Join Date: Mar 2003
Posts: 1,799
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sounds like the symptons of a rich 02 sensor to me. Btw, 87 octane will work perfectly fine in your car.
__________________

"The CEG Nazi"
www.contour.org
1996 Ford Contour SE - Sold
3.0L V6 and Arizona Dyno Chip Turbo Kit
364 whp, 410 wtq @ 16 psi and only 4,700 rpms.
1999 Tropic Green SVT Contour - Bone stock and MINT
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02-05-2004, 01:46 PM
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#4
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AF Newbie
Join Date: Oct 2003
Posts: 4
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Re: Oxy Sensor/CheckEngineLight/Major gas Problem
Yeah, I got the code
P0420 - The PCM has detected that the catalyst system efficency for bank 1 is below threshold for the current engine operating conditions. (Bank 1 indenifies the location of cylinder #1, while bank 2 indentifies the cylinders on the opposite bank)
So I bought the OS sensor for before the catilytic converter.
Will be putting it in shortly, and hopefully that will fix my problem.
Thanks for your help
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03-15-2004, 10:16 PM
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#5
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AF Newbie
Join Date: Mar 2004
Location: PHOENIX, Arizona
Posts: 1
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Re: Re: Oxy Sensor/CheckEngineLight/Major gas Problem
Quote:
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Originally Posted by Popsmear
Yeah, I got the code
P0420 - The PCM has detected that the catalyst system efficency for bank 1 is below threshold for the current engine operating conditions. (Bank 1 indenifies the location of cylinder #1, while bank 2 indentifies the cylinders on the opposite bank)
So I bought the OS sensor for before the catilytic converter.
Will be putting it in shortly, and hopefully that will fix my problem.
Thanks for your help
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 did the os sensor work I have a 95 with the same gas milage and hard starting frist thing in the morning
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10-03-2006, 02:04 AM
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#6
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AF Newbie
Join Date: Dec 2005
Location: Fresno, California
Posts: 50
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Re: Oxy Sensor/CheckEngineLight/Major gas Problem
The forum is more helpfull when you write back, letting everyone know if it fixed the problem.
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10-03-2006, 10:40 AM
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#7
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AF Ford Contour-Advisor
Join Date: Mar 2003
Posts: 1,799
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Re: Oxy Sensor/CheckEngineLight/Major gas Problem
holy old thread batman!
btw, if you want a helpful forum, contour.org is the only contour forum, period. This one pretty much sucks.
__________________

"The CEG Nazi"
www.contour.org
1996 Ford Contour SE - Sold
3.0L V6 and Arizona Dyno Chip Turbo Kit
364 whp, 410 wtq @ 16 psi and only 4,700 rpms.
1999 Tropic Green SVT Contour - Bone stock and MINT
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10-03-2006, 10:44 AM
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#8
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AF Fanatic
Join Date: Apr 2003
Location: Kennedy, New York
Posts: 4,635
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Re: Oxy Sensor/CheckEngineLight/Major gas Problem
you should fix the link in your sig, it goes to the old forums.
__________________
-Josh-
01' 4 Door Blazer
2 RE audio SR15's
6 cubes @ 30.5hz
PG RSD65CS in kickpanels
US Amps IS2080 powering PG's
Big 3 done in 1/0
2 Gauge ran back to optima yellow top
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10-03-2006, 12:21 PM
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#9
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AF Ford Contour-Advisor
Join Date: Mar 2003
Posts: 1,799
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Re: Oxy Sensor/CheckEngineLight/Major gas Problem
Quote:
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Originally Posted by pre98zetec
you should fix the link in your sig, it goes to the old forums.
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done!
__________________

"The CEG Nazi"
www.contour.org
1996 Ford Contour SE - Sold
3.0L V6 and Arizona Dyno Chip Turbo Kit
364 whp, 410 wtq @ 16 psi and only 4,700 rpms.
1999 Tropic Green SVT Contour - Bone stock and MINT
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