Question about 2006 Saturn ION

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I have a saturn Ion and need to know where the O2 sensor is located. It is a 2006 4cyl 2.0. I am not sure if it is before the converter or in the rear of the converter.

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There will be an O2 sensor before the catalytic convert and one after the catalytic converter.

On a four cylinder the one before the cat will be Bank 1 Sensor 1. The one after the cat will be Bank 1 Sensor 2.

Do you have a trouble code for an O2 sensor?

Posted on Sep 27, 2010


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1 Answer

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1 Answer


There should be 2 O2 sensors. One is located before the catalytic converter and one downstream from the converter. I believe they should be right where the catalytic converter is.

I hope this helps! :) Let me know if you need any further assistance in this matter.

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3 Answers

Code po430 not sure what maybe converter

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!

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How do you change the downstream oxygen sensor in a 2003 saturn ion?

Downstream O2 sensor is the O2 sensor after the Catalytic converter. Jack the car off the ground so you can get under it, disconnect the wire leads and with a close end wrench. Snake the wire leads through and wrench and place the wrench one the O2 sensor and with a hammer, tap the wrench to break lose the O2 sensor from the exhaust pipe. Once the O2 sensor has loosen up, just remove and install the new O2 sensor. Reconnect the wire leads, start the car and listen for any exhaust leaks. Once no leak has been determined, Place car back on the ground and go for test drive. Check engine light should go off after three start up and car has reached it's operating temperature and DTC codes will be erased after 100start cycle. Good luck and be safe.

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