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Thread: O2 sensors

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    Beyond Help AVIDMOTION's Avatar
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    Default O2 sensors

    When is a good time to replace the front O2 sensor, and how do you know when they are going or getting lazy. I have 120,000+ on the original. Starting to get lower mpg and slight loss of responsiveness. Nearly everything has been changed that could effect milage, plugs filters oil all fluids etc etc
    SOLD 5/16 BOUGHT 2013 PP SHO...2009 GT 0-60 4.1,RWHP 381@4765,TQ 416.11@3828= 12.58@109.78 KOOKs 1 7/8 /race CATS, VARARAM & HSRK RESONATOR DELETE/3 INCH X PIPE to MAGNAFLOW SS F:Michilin pilot A/S3, R: Cooper Zeon RS3, VCM Ecm/TCM tune by Troy, Russell SS brake lines, hawk hps/ DBA 4000XS, NGK TR-5, YellaTerra 1.85Rockers PAC 1218, CC 7.450 Pro Magnum Rods, FULL BMR poly Rear/DIFF White BUSHINGS,BMR trailing arms/toe rods.FE3 shock/struts, Billet Catch Can, LOVELL's strut mounts/BMR bushing,UDP Ported&PolishTB,red Alto,CircleD 3000

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    Moderator, Retired -Ray-'s Avatar
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    I would put more thought into the injectors and oil/carbon in the intake and heads. A BG injector service runs less than $200. The best thing is to do a compression test.
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    Moderator travis gore's Avatar
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    You would have to run a scan to see what the O2's are doing


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    What is the name of the scan....what do I look for. I have a PLX device. What do I look for? Last year when putting on rockers the heads were extremely clean, I have a catch can, when I v cleaned the intake it too was really clean, void of carbon sludge and oil. The maf and HSRK and air cleaner were cruddy. But all cleaned up nicely. The air filter was mainly filled with sand and bugs.
    SOLD 5/16 BOUGHT 2013 PP SHO...2009 GT 0-60 4.1,RWHP 381@4765,TQ 416.11@3828= 12.58@109.78 KOOKs 1 7/8 /race CATS, VARARAM & HSRK RESONATOR DELETE/3 INCH X PIPE to MAGNAFLOW SS F:Michilin pilot A/S3, R: Cooper Zeon RS3, VCM Ecm/TCM tune by Troy, Russell SS brake lines, hawk hps/ DBA 4000XS, NGK TR-5, YellaTerra 1.85Rockers PAC 1218, CC 7.450 Pro Magnum Rods, FULL BMR poly Rear/DIFF White BUSHINGS,BMR trailing arms/toe rods.FE3 shock/struts, Billet Catch Can, LOVELL's strut mounts/BMR bushing,UDP Ported&PolishTB,red Alto,CircleD 3000

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    Moderator travis gore's Avatar
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    Quote Originally Posted by AVIDMOTION View Post
    What is the name of the scan....what do I look for. I have a PLX device. What do I look for? Last year when putting on rockers the heads were extremely clean, I have a catch can, when I v cleaned the intake it too was really clean, void of carbon sludge and oil. The maf and HSRK and air cleaner were cruddy. But all cleaned up nicely. The air filter was mainly filled with sand and bugs.
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    Beyond Help AVIDMOTION's Avatar
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    No access to such a device....
    SOLD 5/16 BOUGHT 2013 PP SHO...2009 GT 0-60 4.1,RWHP 381@4765,TQ 416.11@3828= 12.58@109.78 KOOKs 1 7/8 /race CATS, VARARAM & HSRK RESONATOR DELETE/3 INCH X PIPE to MAGNAFLOW SS F:Michilin pilot A/S3, R: Cooper Zeon RS3, VCM Ecm/TCM tune by Troy, Russell SS brake lines, hawk hps/ DBA 4000XS, NGK TR-5, YellaTerra 1.85Rockers PAC 1218, CC 7.450 Pro Magnum Rods, FULL BMR poly Rear/DIFF White BUSHINGS,BMR trailing arms/toe rods.FE3 shock/struts, Billet Catch Can, LOVELL's strut mounts/BMR bushing,UDP Ported&PolishTB,red Alto,CircleD 3000

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    any scan tool that has the ability to read direct reading from the O2 sensors - can give you an indication of how they are responding.

    but for the money - and time.

    perhaps you should just get a set and see. I don't think they are expensive (40-50 each) and perhaps get to and replace them. I'm thinking about replacing mine and I have 127 on the clock.
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    Yeah I will replace the front one, back one turned off....any brand better then the next?
    SOLD 5/16 BOUGHT 2013 PP SHO...2009 GT 0-60 4.1,RWHP 381@4765,TQ 416.11@3828= 12.58@109.78 KOOKs 1 7/8 /race CATS, VARARAM & HSRK RESONATOR DELETE/3 INCH X PIPE to MAGNAFLOW SS F:Michilin pilot A/S3, R: Cooper Zeon RS3, VCM Ecm/TCM tune by Troy, Russell SS brake lines, hawk hps/ DBA 4000XS, NGK TR-5, YellaTerra 1.85Rockers PAC 1218, CC 7.450 Pro Magnum Rods, FULL BMR poly Rear/DIFF White BUSHINGS,BMR trailing arms/toe rods.FE3 shock/struts, Billet Catch Can, LOVELL's strut mounts/BMR bushing,UDP Ported&PolishTB,red Alto,CircleD 3000

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    Hmmm....question, I thought I only had two one upstream and one downstream. Looking up prices I see Denso, walker and Bosch, Between 24 and 144. Lists upstream left and right. Downer am listed as 100 bucks more. Confused
    SOLD 5/16 BOUGHT 2013 PP SHO...2009 GT 0-60 4.1,RWHP 381@4765,TQ 416.11@3828= 12.58@109.78 KOOKs 1 7/8 /race CATS, VARARAM & HSRK RESONATOR DELETE/3 INCH X PIPE to MAGNAFLOW SS F:Michilin pilot A/S3, R: Cooper Zeon RS3, VCM Ecm/TCM tune by Troy, Russell SS brake lines, hawk hps/ DBA 4000XS, NGK TR-5, YellaTerra 1.85Rockers PAC 1218, CC 7.450 Pro Magnum Rods, FULL BMR poly Rear/DIFF White BUSHINGS,BMR trailing arms/toe rods.FE3 shock/struts, Billet Catch Can, LOVELL's strut mounts/BMR bushing,UDP Ported&PolishTB,red Alto,CircleD 3000

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    Quote Originally Posted by AVIDMOTION View Post
    Hmmm....question, I thought I only had two one upstream and one downstream. Looking up prices I see Denso, walker and Bosch, Between 24 and 144. Lists upstream left and right. Downer am listed as 100 bucks more. Confused
    A pair of stock AC Delco sensors are under $70 on Amazon.

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