Should I change my catalytic converter?

ETHAN10502

MEMBER
2005 SATURN ION
84,000 MILES

I have a 2005 Saturn Ion 2.2L, I have just replaced the spark plugs, Ignition Coil pack and the ICM because the car gave me a PO300 multiple misfire code. After changing those the car runs fine but now the check engine light came on and it gives me a PO420 Low catalytic efficiency code. My question is, should I replace the Catalytic converter?

7 Replies

KHLOW2008

MECHANIC
41,815 POSTS

If the code keeps coming back after resetting, you would need to replace it.

Since you had misfire codes previously, give the engine some running and erase the codes and retest.

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Monday, September 10th, 2012 AT 6:27 PM

SATURNTECH9

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30,870 POSTS

Just to add to this one more then likely you will have to replace the cat. But like khlow2008 said make sure the missfire is gone and the cat code comes back.

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Monday, September 10th, 2012 AT 6:33 PM

SATURNTECH9

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If your getting that code and there are no exhaust leaks and your 02 sensors are working correctly bad cat. Usually when you have a plugged cat it doesnt set that code.A cat not working correctly emissions wise sets that code.

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Monday, September 10th, 2012 AT 6:34 PM

KHLOW2008

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If you don't have any other codes and has had the vehicle running for some tinme, guess there is no other alternatives but to replace it.

Poor efficiency would not cause any problems but iif the internals becomes cloged badly due to overheating caused by misfires, it can result in loss of perfomance.

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Monday, September 10th, 2012 AT 6:35 PM