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#1 is the up-stream sensor (The O2 sensor located before the Catalytic Convertor). #2 is the down-stream O2 sensor. This sensor is located after the Catalytic Convertor. I hope this helps, let me know if you have other questions concerning this issue. Good luck.
I would first want to know if the sensor is actually failing. A trouble code for a sensor is not a sign the sensor needs to be replaced, only that the data coming from the sensor is out of normal range.
One of three (3) possibitlies:
1. Catalytic Converter is malfunctioning.
2. O2 Sensor is malfunctioning. This will be the O2 Sensor located on the Catalytic Converter. However you should check and/or replace both sensors if needed.
3. You have an Exhaust Leak.
In Order of checking:
A. Check and Repair any Exhaust Leak.
B. Replace the O2 Sensor on the Catalytic Converter 1st. Also Known as the Downstream O2 Sensor or HO2 Sensor.
C. Replace the O2 on the Exhaust Manifold prior to the Catalytic Converter. Also Known as the Upstream O2 Sensor.
D. Replace the Catalytic Converter.
Let me know if this helped, or if you have any additional information, problems or questions. Feel free to contact me at FixYa.com!
on your vehicle the obd1 computer is not as sensitive as obd2 .i have seen o2 sensor not working and no codes were set. so if the sensor looks rusty on the out side or you know that the sensor has not been changed in several years i would replace the o2 sensor.remove the battery ground cable for a couple of minutes to clear the learned values,replaced the o2 sensor then reconnect the ground cable start engine let idle for 2 minutes in park,then 1 min. in drive,then drive for approx.10 min. this will help the computer to relearn.hope this helped