Check Engine Light; Oxygen Sensor

Tiny
THEKIDINBUFF
  • MEMBER
  • 1996 BUICK REGAL
I have a 1996 Buick Regal 3.8. The Check engine light is on for code P0140. Which is oxygen sensor, bank 1, sensor 2, the sensor after the converter. So I went online and bought one for $20 and put it in. The light did not go off so I went back to autozone and the code P0141 and P0140 came up. After a month, I finally got to the junkyard and found a decent sensor that was the same. I had to rewire the plug, (wires could be wrong, but im pretty sure there right). The light is still and I took it back to Autozone and the same two codes came up. Whats the next step? And can the wiring be wrong, hurt the O2 sensor?

Thank You In Advance
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Monday, September 24th, 2012 AT 10:31 PM

7 Replies

Tiny
HMAC300
  • MECHANIC
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If you don't erase teh code when the part is put on it will keep the check engine light on until after 50 or more starts. When a mechanic fixes these he erases the code and i'm not sure autozone will.
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Monday, September 24th, 2012 AT 10:43 PM
Tiny
THEKIDINBUFF
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Well when I did put in the $20 oxygen sensor from the internet, it was in there for a month or 2. Defiantly more than 50 starts. And Autozone will not
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Monday, September 24th, 2012 AT 10:48 PM
Tiny
HMAC300
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So you'll have to get it reset first then see if you get teh same codes
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Monday, September 24th, 2012 AT 10:49 PM
Tiny
THEKIDINBUFF
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Alright, now if the wires have been hooked up wrong, can that cause the oxygen sensor to break?
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Monday, September 24th, 2012 AT 10:56 PM
Tiny
HMAC300
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It woldn't break but he heater may not work and it would send the wrong signal to the pcm. It certainly wouldn't do any good. It might blow a pcm fuse as well or the pcm.
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Monday, September 24th, 2012 AT 10:58 PM
Tiny
THEKIDINBUFF
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Okay so if I did switch the wires, just the heater wires, and then the wires for thee PCM, it could possibly fix my issue?
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Monday, September 24th, 2012 AT 11:07 PM
Tiny
HMAC300
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The codes will have to be cleared after what you did and hard telling if it will fix your issue until you drive it. Ikind of doubt it.
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Monday, September 24th, 2012 AT 11:08 PM

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