Intermittent Code P2271 - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 14 (permalink) Old 05-25-2012, 07:44 AM Thread Starter
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Intermittent Code P2271

I have a 2008 Cobalt with a 2.2 litre engine, automatic transmission. Vehicle has 45K miles, and about 95% of driving is on the Interstate @ 70 MPH. About once a month, the "Check Engine" lite comes on for about 2-3 days, then will go out. Spits out a code P2271, HO2S Signal Stuck Rich Bank 1 Sensor 2. Before I take this to the repair shop, does anyone have any ideas what might be causing this code? The car runs great, and performance/fuel mileage do not seem to be affected. Like I said before, it's very intermittent, AND seems to occur shortly after refueling. I do not try to squeeze more fuel in after the gas pump clicks off, (I know that's a no-no), not so sure that my GF doesn't try to overfill. I've told her not to, but ?????. Any thoughts are appreciated! One last thing, is Sensor 2 the "Downstream" O2 sensor? Thanks!
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post #2 of 14 (permalink) Old 05-25-2012, 08:00 AM
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I believe that is the 2nd O2 sensor, after the cat. Probably going bad, although it shouldn't be. Others can correct me if I'm wrong but that code should mean that there is an incorrect cat flow/ratio. Maybe the cat is bad.
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post #3 of 14 (permalink) Old 05-25-2012, 09:00 AM
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It is the second one after the cat. If I were you I would disconnect second HO2 sensor and clean contacts and maybe add a little dialectric grease to keep moisture out, then re-assemble. Try it if error comes back maybe your cat is tired. Do you run gas only or E85?

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post #4 of 14 (permalink) Old 05-25-2012, 01:03 PM Thread Starter
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I run fuel that contains 10% Ethanol. Here in Maine, that is our only option.
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post #5 of 14 (permalink) Old 05-25-2012, 02:22 PM
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This is from a GM service bulletin;

• Only vehicles that are listed in the E85 Compatible Vehicles section of this bulletin and/or www.livegreengoyellow.com are E85 compatible.
• All other gasoline and diesel engines are NOT E85 compatible.
• Use of fuel containing greater than 10% ethanol in non-E85 designated vehicles can cause
driveability issues, service engine soon indicators as well as increased fuel system corrosion.
• Repairs to non-FlexFuel vehicles that have been fueled with E85 are not covered under the terms of the New Vehicle Warranty.

Notice:
• Misfire codes (P0300).
• Various O2 sensor codes.
• Disabled traction control or Stability System disabled messages.
• Harsh / Firm transmission shifts.


The only E85 compatible vehicles produced by General Motors are:
• Fuel system and / or engine mechanical component degradation.
• 2000-2002 S-Series pickups with 2.2L (VIN 5- RPO L43)
• 2002-2005 full-size pickups and utilities with 5.3L (VIN Z -- L59)
• 2006 Chevrolet Avalanche, Silverado, Suburban, Tahoe with 5.3L (VIN Z -- RPO L59)
• 2006-2007 Chevrolet Impala, Monte Carlo with 3.5L (VIN K -- RPO LZE)
• 2007 Chevrolet Avalanche, Suburban, Tahoe with 5.3L (VINs 0, 3 -- RPOs LMG, LC9)
• 2007 Chevrolet Express, GMC Savana with 5.3L (VIN Z-- RPO L59)
• 2008 Chevrolet Impala with 3.9L (VIN 3-- RPO LZG)
• 2006 GMC Sierra, Yukon, Yukon XL with 5.3L (VIN Z -- RPO L59)
• 2007 GMC Yukon, Yukon XL with 5.3L (VINs 0, 3 -- RPOs LMG, LC9)
• 2007 Saturn Relay, Buick Terraza, Chevrolet Uplander, Pontiac Montana SV6 (Canada Only) with 3.9L (VIN W -- RPO LGD)

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post #6 of 14 (permalink) Old 05-30-2012, 05:27 AM
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Good morning lugnutz59,

I see you've gotten some great insight, and that you were planning on having this looked into. Have you made any progress on this since your last post? If you decide to work with a dealership, please let me know as I'm available to assist in whatever way I can.

All the best,
Sarah
GM Customer Service
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post #7 of 14 (permalink) Old 05-30-2012, 05:36 PM Thread Starter
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Thank you, Sarah. I do want to have the vehicle repaired. So far, the only thing I have done is to add a can of "Seafoam" to a full tank of fuel. I'm going to drive it a few days and see what happens, if anything. If the problem persists, I will replace the Downstream O2 Sensor, and if that doesn't fix the problem, I'll have to take it to the Dealer. As a side note, I was a Certified Chrysler Master Technician, retiring in 2004 due to health issues. So I do have an idea how this stuff works, but I also know that without a scan tool, I'm just a "babe in the woods" lol. I will keep everyone up to date as I chug along. TIA
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post #8 of 14 (permalink) Old 06-04-2012, 06:51 PM Thread Starter
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Well, I ran a can of Seafoam through the fuel system, the CEL went out for a few days, but is back on again. My next step is to replace the Down-Stream O2 sensor, and hope that cures the problem. I will also give the Cat Converter the "rattle" test, just for giggles.
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post #9 of 14 (permalink) Old 06-14-2012, 07:15 PM Thread Starter
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OK, I "checked" the Cat Converter and no internal rattle. So I Replaced the Downstream O2 Sensor, using an "Exact Fit Bosch O2 Sensor" from AutoZone. I didn't use an OEM Sensor as my local dealer uses Matrix Pricing on their parts, and the price was about double the cost of the Bosch sensor (And I worked at the Mopar Division of this same dealership for 10 years!). The CEL went out, car ran great, and I gained about .3 MPG Average Fuel Mileage. Three days later, Check Engine Light came back on. So, it's off to the dealer (Ugh!!). Probably will have to buy an OEM sensor and go from there. Can't do much else without a Scan-Tool!
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post #10 of 14 (permalink) Old 06-15-2012, 05:18 AM
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Scans are free at O'rieleys and most other local parts stores.


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