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Bank 1 O2 sensor

Tiny
LESLIEWESLEY
  • MEMBER
  • 2000 VOLVO V40
  • 75,000 MILES
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
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Sunday, January 31st, 2016 AT 6:52 AM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Sunday, January 31st, 2016 AT 8:08 AM
Tiny
LESLIEWESLEY
  • MEMBER
  • 3 POSTS
1.9 LTR Turbo
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Sunday, January 31st, 2016 AT 8:20 AM
Tiny
LESLIEWESLEY
  • MEMBER
  • 3 POSTS
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?
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Sunday, January 31st, 2016 AT 8:22 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Sunday, January 31st, 2016 AT 8:27 AM
Tiny
THIS IS MIKE
  • MECHANIC
  • 686 POSTS
LESLIEWESLEY

Code P0171

Someone suggested to clean the master air flow sensor? Can I do that
myself?
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Monday, February 1st, 2016 AT 8:46 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Hi Mike

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

Roy
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Monday, February 1st, 2016 AT 8:48 AM
Tiny
THIS IS MIKE
  • MECHANIC
  • 686 POSTS
LESLIEWESLEY- email response:

I cleaned the MAF sensor. It did nothing.
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Monday, February 1st, 2016 AT 8:49 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Thats what I figured. You need a scan tool to monitor the voltage of the sensor to check it.

Roy
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Monday, February 1st, 2016 AT 8:54 AM

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