what is a bank 1 o2 censor

30

Asked by Oct 17, 2008 at 10:57 AM about the 1997 Saturn S-Series 2 Dr SC1 Coupe

Question type: General

5 Answers

95

For your car, it is the oxygen sensor located either on the exhaust manifold or shortly after it, before the catalytic converter. In case you don't know, oxygen sensors measure how lean or rich your engine's fuel mixture is in real time, letting the engine computer know whether it needs to increase or reduce the amount of fuel getting into the engine. They are quite reliable and last a long time, but eventually they fail and need replacement.

3 of 3 people found this helpful.
30

so bank one is the one befor the cats? there are 230,000 miles on this car and it just has a hard time getting started. Once you get it started it runs perfect. The diagnostic code said bank 1 O2 censor. Would this cause it to sound like it was flooding out when you are trying to start it?

3 of 3 people found this helpful.
375

There is bank 1 and bank 2 depending on the cylinders (this goes for any car) you will either have both or just bank 1. Four cylinder engines (such as yours) only have bank 1. There are however two sensors. Bank 1 Sensor 1 (Before the Cat) and Bank 1 Sensor 2 ( after the cat) On a v6 or v8 engine there will be Bank 1 Sensor 1 and Bank 1 Sensor 2. (Same idea as before but it will relate to one side of the engine. Then Bank 2 Sensor 1 and Bank 2 sensor 2 will be the opposite side of the motor. As for your vehicle, replace the front 02 sensor and you will be good to go. A bad o2 sensor can cause poor starting, bad gas mileage, among many other things.

1 of 1 people found this helpful.
60

How do I know which o2 sensor is bad?

6 of 6 people found this helpful.
60

Without an engine code?

Your Answer

S-Series

Looking for a Used S-Series in your area?

CarGurus has 684 nationwide S-Series listings starting at $2,990.

ZIP:

Saturn S-Series Experts

  • #1
    Alex Nazarian
    Reputation
    1,530
  • #2
    helpmeplease
    Reputation
    1,060
  • #3
    fabian_09_21
    Reputation
    900
View All

Related Models For Sale

Used Honda Civic
816 Great Deals out of 73,280 listings starting at $1,400
Used Ford Mustang
728 Great Deals out of 38,316 listings starting at $895
Used Honda Accord
1,109 Great Deals out of 61,914 listings starting at $999
Used Jeep Wrangler
315 Great Deals out of 16,230 listings starting at $2,500
Used Hyundai Sonata
716 Great Deals out of 50,173 listings starting at $500

Used Cars For Sale

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.