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2004 Buick LeSabre Custom 4dr Sedan

2004 Buick LeSabre
Trim Info:
Front Wheel Drive, 4 Dr Sedan Custom, Large Car
20 mpg city / 29 mpg hwy
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February 19, 2013, 9:51 am

Steve Z

Question: O2 sensors

I have codes saying I have bad O2 sensors, bank 1 - sensors 1 and 2. I replaced both the upstream and downstream sensors, but I'm still getting the codes. In addition, the car is running rough, and has poor power at initial start.

February 23, 2013, 6:44 pm

Ron W
Expert Mechanic

The codes are probably why it is running rough.

If you replaced the sensors already, I'd suspect a wiring issue. Possibly something is pinched or melted which is still causing the codes.

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February 25, 2013, 6:48 am

Steve Z

Thanks Ron. Your suggestion of electrical issues made me wonder about an O2 sensor fuse. Turns out there is a fuse, and not surprisingly, it was blown. More than likely this was the entire problem from the beginning, but with 88,000 miles, it was probably worth changing the sensors anyway. So far so good with the new fuse. Thanks.

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