Bank 1 o2 sensor

2000 VOLVO V40
75,000 MILES
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LESLIEWESLEY
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  • 3 POSTS
Is bank one o2 sensor the front sensor?? And is it called uptake or down flow or something else?? I have to order the part and it is giving me an option of 3 wire or 4 wire?? Which do I want for bank one?? I'm buying it then getting it put on.. I'm a woman, as you can probably tell!! Lol
Jan 30, 2016 at 10:52 PM
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ASEMASTER6371
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there are upstream and downsteam O2 sensors. bank one is the side where number 1 cylinder is located.

what motor do you have in the car???

Roy
Jan 31, 2016 at 12:08 AM
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LESLIEWESLEY
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1.9 LTR Turbo
Jan 31, 2016 at 12:20 AM
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LESLIEWESLEY
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It hasn't been removed so I don't know if it's the 3 wire or four wire sensor.. How do I know if it's the upstream or downstream. The diagnostic said only bank one??
Jan 31, 2016 at 12:22 AM
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ASEMASTER6371
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what was the code???? that will tell me what sensor and it may not even be the sensor. it may be something else
codes never identify bad parts just failed systems


Roy
Jan 31, 2016 at 12:27 AM
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THIS IS MIKE
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LESLIEWESLEY

Code P0171

Someone suggested to clean the master air flow sensor?? Can I do that
myself??
Feb 1, 2016 at 12:46 AM
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ASEMASTER6371
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Hi Mike

you can get some cleaner at a parts store but in most cases, it does not work.

Roy
Feb 1, 2016 at 12:48 AM
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THIS IS MIKE
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LESLIEWESLEY- email response:

I cleaned the MAF sensor. It did nothing..
Feb 1, 2016 at 12:49 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
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thats what I figured. you need a scan tool to monitor the voltage of the sensor to check it.

Roy
Feb 1, 2016 at 12:54 AM
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