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Old 12-09-2008, 01:25 PM   #1
ampenergy88
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Code P0141 -Engine Light On-O2 Sensor


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Hello,
My 99 Tahoes Engine light went on yesterday morning.I took it to the local Advanced Auto Parts store to get My truck scanned and clear the engine light.
The clerk said it was Code 0141 O2 Sensor Bank 1 Sensor2.

He cleared it and it went back on the next day. Does anyone know where my o2 sensor is located?
Do I have 2 of them?
Are they hard to replace? Any info would be appreciated.
Thank you!
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Old 12-09-2008, 01:27 PM   #2
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Driver's side of the engine, second O2 sensor in the exhaust pipe.
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Old 12-09-2008, 01:32 PM   #3
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Is the Sensor Bank 1 Sensor2 in the Exaust Pipe?What does the Bank 1 mean?
Is hard to get at?
Thanks
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Old 12-09-2008, 01:52 PM   #4
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Banks are referring to the sides of the engine. Since you have a V-design type engine, you have 2 banks.
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Old 12-09-2008, 02:03 PM   #5
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Does that mean I have 4 O2 Sensors? Or just 3 and one in the exhaust?
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Old 12-09-2008, 02:10 PM   #6
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I want to say 4 but I may be wrong. Part of me thinks you have 3. One on each bank, those are called pre cat O2, and one post cat
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Old 12-09-2008, 02:32 PM   #7
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You have 4 O2 sensors total. 2 upstream (before cats) and 2 downstream (after cats). The later Tahoes were made with true dual exhaust all the way to the muffler. Right bank is passenger side and left bank would be drivers side. O2 sensors are relatively easy to replace but can be pricey. I recommend replacing all 4 though. Also try cleaning you MAS with the actual MAS cleaner...I swear by it after using it. Hope this helps.
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Old 12-10-2008, 02:57 AM   #8
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just some info for the masses.

Bank 1 on an OBDII vehicle is always the bank with cylinder 1,coincedentally this always falls on passenger side of Ford and Chevy firing orders.
Bank 2 is the other bank.
Each bank has it's own Sensor 1
Each catlytic convertor has it's own sensor 2
If you got two convertors you should have 2 02 sensors after cat. If you have one cat then you will only have one 02 sensor after it(sensor 2)
Pretty sure you got two cats though.
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Old 12-10-2008, 08:21 AM   #9
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Quote:
Originally Posted by DefEddie View Post
just some info for the masses.

Bank 1 on an OBDII vehicle is always the bank with cylinder 1,coincedentally this always falls on passenger side of Ford and Chevy firing orders.
Bank 2 is the other bank.
Each bank has it's own Sensor 1
Each catlytic convertor has it's own sensor 2
If you got two convertors you should have 2 02 sensors after cat. If you have one cat then you will only have one 02 sensor after it(sensor 2)
Pretty sure you got two cats though.

Are you sure? It is my belief that on Chevy LS engines Bank one is on the driver's side. Ford's Bank one is on the passenger side.
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Old 12-10-2008, 12:48 PM   #10
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I certainly hope DefEddie is wrong, because every GM I've owned has #1 cylinder on the driver's side. I'm in Canada and I know that American and Canadian models are different but I don;t think they are that different. The two I own presently (5.7 & 5.3) have #1 on the driver's side.
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