1995 Honda CIVIC Oxygen Sensor?

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aavaraa

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I have a 1995 Honda CIVIC 1.6 VTEC 2 dr coupe. It's got 199k miles on it. A week ago, emissions (in Atlanta, GA) failed. I was told that it could be oxygen sensor and/or the cat converter.

I asked around and found out that shops will charge about 90.00 to just read the code. AUTOZONE does not read the code as it is OBD1 .

I am thinking about replacing the Oxygen sensor myself (I know where it is and am not technically or mechanically challenged and think that I can handle this myself)

I am thinking I will replace the oxygen sensor and then if emissions still fail then I will know its the cat converter.

My questions :
1- I thought there was only one Oxygen Sensor (under the hood and not under the car in the back) on 1995 CIVIC but one of the mechanic has told me that there are two and he does not know (without reading the OBD1 which one to replace) ... He will charge 90.00 to read the code ... How many oxygen sensors are there on this car ?

2 - If there is one, I will change it myself but want to know which brand (after market) I should go with.. I dont want the check engine light to come on (i've heard that it does with some sensors)

Thank you all in advance for reading and for helping me out with this.
 
The 02 sensor that effects the fuel ratio is the front sensor. The 02 sensor after the converter is only to monitor the converter to make sure it is working. You will just be throwing money at the car with no idea where to start or what is wrong.
Start by going to the dealer where they not only read the codes but also have a more advanced scanners that read the engine data. They will watch the milli-volt readings on the front and rear 02 sensors to check their voltages as well as the rate of voltage change. This is how to determine if the 02 sensors or converter are the problem.
They will also read the MAF sensor, temperature sensor, manifold pressure,etc.
A misfire will also throw off the fuel ratio readings.
As you can see there is a good reason why mechanics are trained and have thousands of dollars tied up in tools to repair your vehicle correctly. This is one of those times!
Have them run your VIN number for open recalls while you are there.
 
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