ok guys.. ive been searching all day but couldnt find what i was looking for.. my problem is that ive been getting bad gas milage.. maybe 150 miles a tank.. now my question is that..
1. if my o2 sensor is bad. wouldnt i get a code on my ecu regarding my o2 sensor?

2. if i was to replace it. should i get 2 o2 sensor. or just 1?

3. from what car i should get those from?

4. should i go to my local autozone, pepboys, and kragen, or go to the dealer?

thanks for your time guys.

 

1. if my o2 sensor is bad. wouldnt i get a code on my ecu regarding my o2 sensor?

Not always. O2 sensors slowly wear down and you'll only get a code when it is no longer functional

2. if i was to replace it. should i get 2 o2 sensor. or just 1?
If you're OBDI then just 1, OBDII then 2

3. from what car i should get those from?
Get the right sensor for your car

4. should i go to my local autozone, pepboys, and kragen, or go to the dealer?

[B]You can get an 4 wire Universal from any store. If you go to the dealer they are going to want a lot of money. If you want OEM quality get a Denso sensor from http://www.oxygensensors.com[/B]

 

oh i forgot to add that i have a b16a

 

also how hard is it replacing those o2 sensor??

 

unscrew rewire screw back in, however you may need to get the tool to remove it if you cant get it off.

 

i need to know of what car should i get the o2 sensors from.. i have a b16 first gen motor. and my o2's have one wire..
also will a universal o2 sensor work for both of them???