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02-08-2009, 10:10 AM
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#1
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Junior Member
Join Date: Dec 2006
Posts: 2
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Hi
This is my first post, so hope I don't foul it up. I am using a AeroForce Scan Gauge on a 2007 Itasca W20 chassis. When I monitor the O2 sensors they read about the same, but they bounce between 100 to 500 MV. Is this Normal?
Dean Norris
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2007 Itasca 35J , Workhose W20 Chassis, Ultra Power, Koni, Ultratrac Track Bars, Safe-T-Plus, Surge Guard, Inteli-Power, Pressure Pro, Trik-L-Start, AeroForce, SeeLevel II, Hughes Autoformer
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02-08-2009, 12:29 PM
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#2
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Member
Official iRV2 Sponsor
Join Date: Jul 2007
Location: Centralia, WA
Posts: 73
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Dean,
The 02 sensors work in a range of .1v(lean) to .9v (rich) and switch lean/rich constantly in order to achieve an average of .55v which is 14.7/1 air/fuel ratio.
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Steve Brazel
Workhorse Premier Dealer
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02-08-2009, 01:16 PM
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#3
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Junior Member
Join Date: Dec 2006
Posts: 2
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Quote:
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Originally posted by tech@brazelsrv:
Dean,
The 02 sensors work in a range of .1v(lean) to .9v (rich) and switch lean/rich constantly in order to achieve an average of 5.5v which is 14.7/1 air/fuel ratio.
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Thanks Steve
__________________
2007 Itasca 35J , Workhose W20 Chassis, Ultra Power, Koni, Ultratrac Track Bars, Safe-T-Plus, Surge Guard, Inteli-Power, Pressure Pro, Trik-L-Start, AeroForce, SeeLevel II, Hughes Autoformer
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03-10-2009, 10:11 PM
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#4
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Senior Member
Workhorse Chassis Owner Winnebago Owners Club
Join Date: Feb 2009
Location: San Jose CA
Posts: 122
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Hi, Your scanner is not an accurate picture of the actual O2 Sensor voltage. A digital scope or a graphing volt meter should be used. If you do not have a O2 code don't worry about the O2 voltages displayed on your scanner.
I am a licensed ASE Certified Master Tech. and have been in the Automotive repair business for 30+ years. O2 sensors do fail and become "lazy" but not very often. I do not believe that replacing O2 sensors because of age, mileage or what the kid at the auto parts store says, is needed, only if they test bad.
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Jim
2007 Winnebago Voyage 35L, W24
Retired and Having Fun 
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03-11-2009, 06:35 AM
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#5
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Senior Member
Commercial Member
Newmar Owners Club Texas Boomers Club
Join Date: Feb 2003
Location: Jarrell, TX 76537
Posts: 3,792
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I agree with Steve and Jim... But, should you want to check out your O2 sensors and/or any other part of you system the use a good scan tool like Car Code OBD2 that has the ability to record, store and export scanned data. They have someone like Steve at Brazel's to analyze it.
There are any number of scan tools available to do the scan & export. But, Car Code OBD2 gives a good bang for the $$.
__________________
Dale/aka-Oemy Oemy's UltraPower Performance
Ultra Power'd/Ultra Trac'd/Magnum Plug Wires/AC 41-101's/DIY CAI/Koni's
2004 Mountain Aire MACA 3651-1997 Honda CRV - Toad
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03-11-2009, 12:23 PM
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#6
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Jul 2006
Location: SE PA
Posts: 266
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Who would have thunk it! Ask a question and get three good answers.Now if I could find a finnacial site half as good.........
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'09 Winnebago Adventurer 32H 
Workhorse W-22, UltraPower,496 cubic inches of 
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03-11-2009, 01:15 PM
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#7
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Senior Member
Workhorse Chassis Owner
Join Date: Jan 2007
Location: Roving, Datastorm users 3192
Posts: 756
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Quote:
Originally Posted by millsrv
Hi, Your scanner is not an accurate picture of the actual O2 Sensor voltage. A digital scope or a graphing volt meter should be used. If you do not have a O2 code don't worry about the O2 voltages displayed on your scanner.
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You know..... That makes a lot of sense
(But then the part I cut (your credentials) kind of explain that
__________________
Nothing adds excitement like something that is none of your business.
2005 Damon Intruder 377W Radio Active as WA8YXM
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