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P0141: bank 1 sensor 2 problem...

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Old 05-13-2009, 01:51 AM   #1
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P0141: bank 1 sensor 2 problem...

hello everyone.

i have this P0141 code. i know this is the O2 sensor after the cat if i am correct. my concern is will this affect gas mileage, damage the engine in any way, or do anything bad to my truck? truck drives fine btw but i am just concerned. i want to use it but i don't want to damage anything or cause some other serious stuff.

thanks!
97 S10
2.2 L manual
101,000 miles
CAI [chome intake]
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Old 05-13-2009, 10:50 AM   #2
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Re: P0141: bank 1 sensor 2 problem...

Quote: Originally Posted by kmomotaro
hello everyone.

i have this P0141 code. i know this is the O2 sensor after the cat if i am correct. my concern is will this affect gas mileage, damage the engine in any way, or do anything bad to my truck? truck drives fine btw but i am just concerned. i want to use it but i don't want to damage anything or cause some other serious stuff.

thanks!
97 S10
2.2 L manual
101,000 miles
CAI [chome intake]
Other then annoying you with the service engine light, there will be no negative effects from that code. It is the heating element in the o2 sensor is going bad or is bad. The heating element warms up the sensor when you first start the vehicle so that it can get a reading to the computer sooner. I have had the same code pop up since last fall when I had to drive threw a huge water hole on a trail. I still continue to get an average of around 20mpg in town and 24-25 on the highway. Note that the mileage is a bit lower then the average 2.2 because I am running big tires.

Here's the code information:
Trouble Code: P0141 (2.2L L4 VIN 4 Std)
HO2S-12 (Bank 1 Sensor 2) Heater Circuit Malfunction


Print this code data

Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL DetailsTrouble Code Conditions:
DTC P0105-P0108, P0112-P0118, P0122, P0123, P0171, P0201-P0204, P0301-P0304, P0335, P0440-P0446, P0506, P0507, P0601, P0602 and P1441 not set, ECT and IAT sensors below 113ºF and within 45ºF at startup, fuel level over 10%, HO2S signal from 395-495 mv, an

Possible Causes:
  • HO2S heater ground circuit is open or has high resistance
  • HO2S heater power circuit is open (test O2S fuse in fuse block)
  • HO2S heater element is damaged or has failed
  • PCM has failed
  • TSB 01-06-04-003 contains a repair procedure for this code
Troubleshooting:1998 Chevrolet S-10, 2.2L
Old 05-02-2012, 06:56 AM   #3
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Re: P0141: bank 1 sensor 2 problem...

Links are dead below and......
Print this code data

Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details

Indicators: MIL DetailsThis is a TSB for a cavalier and not an S10 below.
  • TSB 01-06-04-003 contains a repair procedure for this code
Troubleshooting:1998 Chevrolet S-10, 2.2L[/QUOTE]


I took the liberty of checking into this yesterday since I have had this issue forever now. Made a trip to the GM dealer to talk with parts guy about the TSB 01-06-04-003 and it pulls up for cavaliers but not S10. He then told me to go to service and asked them about the code with the make and model of truck, which I did. Service tells me the same thing about the TSB however he then just looked up my specific truck model,etc.... and the code number it puts out (P0141) and His info tells him that it is either a leak in the exhaust or intake , that a smoke test is what they perform at the dealer to detect the leak..... putting this up here for the record and for future searches. Not sure what the cavalier tsb fix said (not really worried since my truck is an S10 and not a cavalier) Guess i will be adding this to the ta do list sometime here.
Old 05-19-2012, 12:51 PM   #4
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Re: P0141: bank 1 sensor 2 problem...

I had a similar failure on my 2002 S10, 2.2L. The code was P0141, heater circuit in bank 1, sensor 2. That's the one downstream from the catalytic converter. I replaced the O2 sensor, had the code cleared and drove back and forth to work for 3-days. My round trip to work is almost 100 miles. Thinking that the problem was fixed, I drove from work directly to the emissions testing facility. When I pulled in, I noticed that the check engine light had come back on. I had the codes scanned again, this time it was showing a P0141 (same as before), a P1137 and another P0141, in that order. When I crawled under the truck, I noticed that the pigtail coming off the new O2 sensor was frayed and a couple of the wires where worn in 2. As it turns out, the pigtail on the new sensor was a bit longer than the original, long enough that it rubbed against the drive shaft. AutoZone was kind enough to consider that the sensor was under warranty, even though it was my screwup, and swapped it out with another. After disconnecting the negative battery cable, I installed the new one. Then, and this is important, I bunched up the extra pigtail length and zip tied it to prevent it from rubbing. After reconnecting the negative battery cable, the CES light was off. My hope is that someone else will read and avoid this annoyance. Worse case scenario would have been that the damage to the new sensor would not have been covered by the warranty and I'd be out another $70.
Old 05-19-2012, 03:51 PM   #5
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Re: P0141: bank 1 sensor 2 problem...

If someone told me that code P0141 was an intake leak or and exhaust leak, I would immediately know they are a bumbling idiot. Then furthermore if they were going to do an evaporative smoke test for an intake leak or an exhaust leak, I would know they are completely clue-less and have no business being in the car business.
Stay away from that man, he does not understand what you are talking about.
Old 05-21-2012, 10:44 PM   #6
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Re: P0141: bank 1 sensor 2 problem...

Quote: Originally Posted by Johnniespeed
If someone told me that code P0141 was an intake leak or and exhaust leak, I would immediately know they are a bumbling idiot. Then furthermore if they were going to do an evaporative smoke test for an intake leak or an exhaust leak, I would know they are completely clue-less and have no business being in the car business.
Stay away from that man, he does not understand what you are talking about.
Please explain why?
Old 07-10-2013, 03:09 PM   #7
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Re: P0141: bank 1 sensor 2 problem...

I had this code, replaced my downstream O2 sensor, and after 1,500Km the code is back. Wiring is fine and the connector is all the way plugged in. Any ideas?

This is on my 2.2.
Old 02-26-2015, 01:55 PM   #8
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Re: P0141: bank 1 sensor 2 problem...

this seems to be a common problem with these vehicles. Mine is back again with this very code PO141 , plus now has the PO420 code to go along with it. Since getting help for this seems to be kind of scarce. Thinking on making a thread on it with my experiences and the things I have done to try to fix the issue.
Things replaced to date.
1 OEM exhaust manifold from the dealer
2 flex pipe
3 Bank 1 sensor 1 o2
4 bank 1 sensor 2 o2 ( have replaced this one twice now)
5 Brand new Magnaflow catalytic converter
6 plenty of seafoam treatments since I have owned the truck
7. The anti fouler plug setup (WHICH WAS DONE CORRECTLY AND "DID NOT CURE MY 141 CODE!!!!!!!) I AM THINKING IT WONT BECAUSE THE CODE IS ABOUT A GROUND/CIRCUIT PROBLEM and not a cat malfunction.
8 AND AN ABUNDANCE OF INTERNET SEARCHS, READING AND VIDEO WATCHING ON THIS PARTICULAR CODE.


I have done some wire testing on the actual wiring harness side of the connector that plugs up with the O2 connector itself and have found that it is my culprit,, or so I HOPE! gonna get a new connector for it today and report back on it for the rest of you

Last edited by code_red63366; 02-26-2015 at 01:59 PM. Reason: typing error number 2
Old 02-26-2015, 07:51 PM   #9
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Re: P0141: bank 1 sensor 2 problem...

Ok..so I picked up the new connector and swap it out for the old one. I am now getting a O2 bank 1 sensor 2 reading. I have erased the code and will update once the car has completed its cycle or ses light comes on again...whichever comes 1st. Below are some pictures i took of the old connector. It was in very sad shape with only 1 prong sticking through to the connector side. The other 3 were no where to be found. Looks as if the previous owner tried to disconnect the connector from the wrong side (back side) pulling the 3 prongs right out of it. I will give an update in a day or 2.

[IMG][/IMG]
Old 02-26-2015, 07:55 PM   #10
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Re: P0141: bank 1 sensor 2 problem...

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Old 02-26-2015, 07:59 PM   #11
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Re: P0141: bank 1 sensor 2 problem...

Here you can see the only prong lefted in the connector side
[IMG][/IMG]
Old 03-01-2015, 08:59 AM   #12
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Re: P0141: bank 1 sensor 2 problem...

UPDATED * Day 3....No SES light, yet. Used the Actron to check and see if it is ready for State emissions test.. according to my state laws it is. The ecm has run all it's cycles except for the EVAP. It is the only one that is inconclusive.Missouri lets you by on 2001and newer vehicles with only one test inconclusive and no more than one. Only exception to fail is if it is a catalyst code or inc. It has snowed here so there won't be much done today.( 96 to 2000 vehicles get 2 inc.'s and no more)
Old 03-01-2015, 03:51 PM   #13
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Re: P0141: bank 1 sensor 2 problem...

From the looks of that connector, it was due.

California HAD that same policy...2 "not readies" for 1996-2000 and 1 "not ready" for 2001 on. They have just reduced both of those by one. That means that I have to make sure all my readiness monitors are ready next smog test. The states have some leeway on this but from what I can determine, this is what the EPA is recommending be the policy. So for you guys that live in states with a bunch of environmental activists, this is probably what you'll be seeing too. Last time it took AIR 3 months to run even though there were no codes. If the tank isn't filled to the right amount, the temperature isn't right, you don't drive it the right speed etc. etc. etc., the test won't run. I just got one of those little battery backup things for the cigarette lighter, never used to worry about it before.
Old 03-01-2015, 06:06 PM   #14
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Re: P0141: bank 1 sensor 2 problem...

Tell me about it! Meanwhile I need to get my plates renewed yet if it were the other way around to where all tests must be ready, then I would have no choice but to drive Ilegally, carying around all my paperwork, waiting to be pulled over for expired tags and have the daunting task of explaining to the officer why I have to drive with expired tags. Hopefully I would be lucky and get an officer who would be understanding However from my last go around experience of driving without my updated tags on my vehicle ( I had the correct tags with me in the car, they just fell down between the seat and I had forgotten all about them)..anyways after showing him the correct tags..he still wrote me a ticket. So guess your damned if you do when it comes to getting a car ready and damned if you don't
Old 03-02-2015, 08:59 PM   #15
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Re: P0141: bank 1 sensor 2 problem...

Update:
Well day 5 since codes were erased..no check engine light. However the EVAP Test verdict is still inconclusive. It's the only one taking forever to complete.
Old 03-02-2015, 09:25 PM   #16
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Re: P0141: bank 1 sensor 2 problem...

For the evap to run:

1. Fuel level between 3/4 and 1/4
2. Test runs after cold start - coolant and air temp between 39 and 86 F
3. Ethanol content less than 11%
4. Difference between ECT and IAT is less than 14F
5. Battery between 10-18v
6. Barometric pressure > 75 kPa
Old 03-02-2015, 09:55 PM   #17
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Re: P0141: bank 1 sensor 2 problem...

Quote: Originally Posted by rimara
From the looks of that connector, it was due.

California HAD that same policy...2 "not readies" for 1996-2000 and 1 "not ready" for 2001 on. They have just reduced both of those by one. That means that I have to make sure all my readiness monitors are ready next smog test. The states have some leeway on this but from what I can determine, this is what the EPA is recommending be the policy. So for you guys that live in states with a bunch of environmental activists, this is probably what you'll be seeing too. Last time it took AIR 3 months to run even though there were no codes. If the tank isn't filled to the right amount, the temperature isn't right, you don't drive it the right speed etc. etc. etc., the test won't run. I just got one of those little battery backup things for the cigarette lighter, never used to worry about it before.
Does that vary by region in CA ? I had a test last week at a STAR station no less and they said 1 not run or pending was OK. Also had one done back in Nov 2014 with same criteria. 2004 and 2001 model years.
Old 03-02-2015, 10:04 PM   #18
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Re: P0141: bank 1 sensor 2 problem...

I read that this was supposed to take affect on March 1 but I'm not sure if it did or not. Also, maybe some counties don't require it, not sure. If you try to look for info on the subject on the Air Resources Board site, I couldn't find much. I'll look to see if I can find the link to the site I was reading this on.
Old 03-03-2015, 01:45 AM   #19
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Re: P0141: bank 1 sensor 2 problem...

Here's the California Bureau of Auto Repair (BAR) site's explanation of the changes. They say the changes will begin May 1, not Mar 1. I know a lot of you don't give a flying F what happens in California but this sort of thing has a way of spreading...maybe even to YOU

https://www.bar.ca.gov/Industry/BAR-...tml#Question55

HOW WILL THE OBD INSPECTION FAILURE CRITERIA CHANGE? Section 3340.42.2 of the California Code of Regulations lists possible failure criteria for OBD II-equipped vehicles. The new readiness monitor standards will be implemented on both the BAR-97 EIS and the OIS after the OIS equipment is required statewide. BAR will notify stations prior to monitor change. The failure criteria include the following:
  • MIL does not illuminate when the ignition is on and the engine is off;
  • MIL illuminates continuously or flashes with the engine running;
  • OBD system reports the MIL as commanded on;
  • OBD system reports a Diagnostic Trouble Code (DTC);
  • OBD system data indicates the system has not yet been sufficiently operated to determine the presence or absence of a DTC;
  • OBD system does not communicate with the EIS or OIS;
  • OBD system data is inappropriate for the vehicle being tested;
  • OBD system data does not match the original equipment manufacturer (OEM) or an Air Resources Board (ARB) exempted OBD software configuration;
  • OBD system reports incomplete readiness monitor(s) as specified below:
  • Gasoline-powered vehicles model-years 1996 through 1999 with more than one (1) incomplete monitor;
  • Gasoline-powered vehicles model-years 2000 and newer with any incomplete monitors, excluding the evaporative system monitor;
  • Diesel-powered vehicles model-years 1998 through 2006 with any incomplete monitors;
  • Diesel-powered vehicles model-years 2007 and newer with any incomplete monitors, excluding any exhaust after treatment related (e.g., particulate filter, NOx adsorber, etc.) monitors.
WHEN WILL THE NEW OBD MONITOR READINESS STANDARDS BE IMPLEMENTED?
Starting May 1, 2015, BAR plans to reduce the number of allowable incomplete OBD II readiness monitors for both BAR-OIS and BAR-97 inspections to the following new criteria:
  • Gasoline vehicles: - 1996-1999 model-years are allowed one incomplete readiness monitor
    - 2000 and newer model-years are allowed only an incomplete evaporative monitor
  • Diesel vehicles: - 1998-2006 model-years require all monitors to be complete
    - 2007 and newer model-years are allowed only an incomplete exhaust after-treatment system monitor (e.g., particulate filter, NOx/SCR treatment, catalyst, etc.)
Old 03-03-2015, 11:07 AM   #20
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Re: P0141: bank 1 sensor 2 problem...

  • OBD system data is inappropriate for the vehicle being tested;
  • OBD system data does not match the original equipment manufacturer (OEM) or an Air Resources Board (ARB) exempted OBD software configuration;

    these are bad for anyone who's reprogrammed their ECM's

    glad I don't live there....
Old 03-03-2015, 10:54 PM   #21
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Re: P0141: bank 1 sensor 2 problem...

sincere apologies for helping take this off topic from the original post, but that happens...and after all it was resurrected from 2012 anyway

Quote: Originally Posted by Mechnix
  • OBD system data is inappropriate for the vehicle being tested;
  • OBD system data does not match the original equipment manufacturer (OEM) or an Air Resources Board (ARB) exempted OBD software configuration;

    these are bad for anyone who's reprogrammed their ECM's

    glad I don't live there....
Which is why I ended up going with a fresh GM flash on my E67 ECU for my engine change.

Not just CA, about half of the states now use OBD test (only) as I understand it.

CA also allows 500 "specially constructed vehicles" each year if you want to build something unique. (i.e. like Cobra kit cars).

CA has been running statistical analysis that shows OBD test (only) will result in reduced costs for consumers with very minimal impact on overall emissions. My bet is all states will eventually go this way. http://epa.gov/obd/questions.htm
Old 03-07-2015, 01:22 PM   #22
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Thumbs up Re: P0141: bank 1 sensor 2 problem...

Quote: Originally Posted by rimara
For the evap to run:

1. Fuel level between 3/4 and 1/4
2. Test runs after cold start - coolant and air temp between 39 and 86 F
3. Ethanol content less than 11%
4. Difference between ECT and IAT is less than 14F
5. Battery between 10-18v
6. Barometric pressure > 75 kPa
Thanks Rimara!
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