Oxygen Sensor...maybe - Hummer Forums - Enthusiast Forum for Hummer Owners


Hummer H3 For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine.

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Old 01-12-2018, 10:35 PM
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Default Oxygen Sensor??

My check engine light came on so I got around to pulling codes....P0030 and P0135. Thought to myself, my gas mileage might not be as good, power doesn't seem to be 100% and I thought I noticed a very minor lag time once or twice when I accelerated from a stop. Decided to replace the oxygen sensor with one I found online. The old sensor looked pretty burnt up. Took the truck out for a drive and when I turned out of the neighborhood and accelerated the RPMs dropped to idle, even after I put my foot to the floor. After 3-4 seconds the RPMs increased and I could get up to speed. This happens almost every time I start from a stop or slow to make a turn. The RPMs don't drop while staying at speed. Was my new oxygen sensor made by a deviant hybrid driving hippie or a chimpanzee imprisoned in an auto parts factory in China? Did I use a left handed socket wrench by mistake?? Help appreciated.

Last edited by dan385; 01-12-2018 at 11:02 PM. Reason: New title
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Old 01-12-2018, 11:41 PM
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Is it a cheapo Chinese product?
Try using the same quality brand as original.
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Old 01-13-2018, 10:40 AM
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actron obd2 scanner will show o2 voltage fluctuations from 0-1v. then u know
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Old 01-13-2018, 01:48 PM
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Drove the truck again and checked it with obd2 scanner. o2 codes were gone and voltage was reading 0.5-0.6v on the sensor. Other codes showed up though, co244 torque malfunction? co268 abs? u1000(After I replaced the o2 sensor I did pull the pcm fuses to reset the engine light)......While I was checking the codes the engine light came back on and p0300(misfire) showed up. Seen that one before, replaced my plugs and coil packs to get rid of it. It seems to come and go.

Last edited by dan385; 01-13-2018 at 01:54 PM.
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Old 01-13-2018, 04:16 PM
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Quote:
Originally Posted by dan385 View Post
Drove the truck again and checked it with obd2 scanner. o2 codes were gone and voltage was reading 0.5-0.6v on the sensor. Other codes showed up though, co244 torque malfunction? co268 abs? u1000(After I replaced the o2 sensor I did pull the pcm fuses to reset the engine light)......While I was checking the codes the engine light came back on and p0300(misfire) showed up. Seen that one before, replaced my plugs and coil packs to get rid of it. It seems to come and go.
Am I reading that right, you joined this forum 10/2006?
Wow... You should be educating others by now..

P0300 code is a random misfire detected, which is most commonly caused by fuel or air delivery, and not cylinder specific.

Common issues with the H3:
Intake manifold leak
pcv leak
fuel pump module lines rotted (if you smell fuel)
Maf sensor cleaning
Throttle body cleaning
Fuel induction cleaning
Fuel injector cleaning

GL
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Old 01-13-2018, 04:36 PM
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Originally Posted by hummerz View Post
Am I reading that right, you joined this forum 10/2006?
Wow... You should be educating others by now..

P0300 code is a random misfire detected, which is most commonly caused by fuel or air delivery, and not cylinder specific.

Common issues with the H3:
Intake manifold leak
pcv leak
fuel pump module lines rotted (if you smell fuel)
Maf sensor cleaning
Throttle body cleaning
Fuel induction cleaning
Fuel injector cleaning

GL
Yeah I bought my H3 new in 06. 12 years later and I have 94,000 miles. Never had many issues. Cleaned out my throttle body and replaced my coil packs and plugs when I first got a misfire code. Had a crack in the radiator by the lower hose and had to replace the radiator. Other than that jus minor simple, or cosmetic stuff. I used the forum mainly for the H1 and humvees I had (and miss☹️).
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Old 01-13-2018, 04:36 PM
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1 other thing with all those codes you have showing up, check the pwr/trn relay #81. pull and inspect it..
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Old 01-15-2018, 10:04 PM
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Replaced the o2 sensor again, this time with a Bosch (51513). Truck ran great, no issues. The other o2 sensor I bought online was junk or not for my truck. Lesson learned.
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Old 01-16-2018, 01:41 PM
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Quote:
Originally Posted by dan385 View Post
Replaced the o2 sensor again, this time with a Bosch (51513). Truck ran great, no issues. The other o2 sensor I bought online was junk or not for my truck. Lesson learned.
Cheap parts are cheap for a reason.
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