Question about 2003 Saturn ION

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Oxygen sensor location on a 2003 Saturn Ion-1

My check engine light came on in my 2003 Saturn Ion-1 and indicated a problem with my oxygen sensor. Where is the oxygen sensor located and is there more than 1? If so, how do I determine which is the bad one?

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  • Anonymous Mar 16, 2014

    changed 1 sensor can not locate the upper sensor need a map of engine to see where the upper oxygen sensor is on the engine

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One is front of the cat, and one after the cat of the exhaust.
The OBD Scanner should tell you which bank is producing the error.
Bank one is the front one.

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Posted on Feb 21, 2009

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On a 2003 ion 2.2 litre where is the co2 sensor and is there more then one


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Jan 20, 2011 | 2003 Saturn ION

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I HAVE A 2003 SATURN ION. THE CHECK ENGINE LIGHT KEEPS COMING ON. I HAD THE CAR HOOKED UP TO AN ANALYZER AND IT COMES UP WITH A MAP SENSOR CODE. I REPLACED THE MAP SENSOR AND THE PROBLEM DID NOT GO AWAY....


On your vehicle when the Check engine light comes on and a code is store, the driver can retrieve the codes themselves with the onboard diagnostics. Put the key in the on position and watch for the light.The light will blink in a code .FOR EXAMPLE:
If the light blinks 4 flashes then a pause then 3 flashes then .......yep code 43. Easy enough.
Oh yea, by the way A bad intake manifold gasket would be a constant problem which would cause a vacuum leak. ( That's if it effected engine performance) A vacuum leak would be sensed at the Oxygen sensor as a lean condition. Code 44

Try the codes yourself
http://www.troublecodes.net/saturn/

Sep 20, 2010 | 2003 Saturn ION

1 Answer

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.

Jan 11, 2010 | 2003 Saturn ION

1 Answer

What does it mean when the dashboard indicator


that is your 'check engine' light.if it stays on, one or more sensors on your engine has sent a 'trouble code' to the on-board computer.a diagnostic code reader needs to be connected to it to determine the cause.

Oct 02, 2009 | 2003 Saturn L-Series

1 Answer

Ned to replace oxygen sensor bank 1 upstream need to know where it is in the car


Up stream O2 sensors are always before the convertor. Check the exhaust manifold, if you have a V6 you may have two, make sure you know which one is bad.

Nov 08, 2008 | 2003 Saturn ION

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