Question about Saturn Astra

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Saturn Astra P0420 Problem

I bought a used astra. It had a p0420 code on it, and it would come up every few hundred km. I replaced the flex pipe, and muffler, and there are no noticeable leaks. I changed the downstream o2 sensor and installed a spacer to decat it. When I do this, I get p0141 for some reason, and it goes away when I take it off. Is there a reason for this? I really dont want to spend hundreds on an aftermarket cat only to find out I will get the same code

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Hi , A PO420 code on all cars and trucks is a bank 1 cat failure and this code is determined by the ECM (Engine Control Module) by 2 sensors the Up stream O/2 sensor (otherwise known by some car manufactures as a Air/fuel sensor) and the down stream O/2 sensor. If you remove the Cat you will still receive a code due to the down stream O/2 is looking for certain gases which is produce only by the Cat as exhaust gases is passing through it. So yes there is no way around it if your getting a PO420 it is best to first take your car into a reputable shop to find out what is causing the cat to fail in the first place ( most likely due to O/2 sensor failure ) and possibly other things that could of failed leading to O/2 sensor failures along with the Cat.

Hope this answers your question.
Pat

Posted on Dec 27, 2016

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Possible Solutions Need a catalytic converter? Visit our catalytic converter shopping area for the lowest price on your replacement converter!
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  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
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