Questions & Answers for: Saturn p0420 code

...P0420 CODE I ASKED THE QUESTION ABOUT MY 1996 SATURN AND YOU JUSST REPLIED ASKING ME A BUNCH OF QUESTIONS... THE CODE IS P0420 YES, THE CHCK ENGINE LIGHT IS ON ok knowing the code is what its all ...

check engine light on 2005 saturn vue code is p0420 i know this should be the catalytic converter or oxygen sensors. But which one? can anyone help? more common is the o2 sensor

p0420 code shows p0420 codes shows engine light comes on P0420 Catalyst System Efficiency Below Threshold (Bank 1) You have a worn out catalytic converter.

...P0420 code indicates a problem with 1 or more O2 sensors. They send incorrect emissions information back to the ECM and trigger the Check Engine Light. If the Catalytic Converter is fine (no problems ...

...code P0420 http://www.obd-codes.com/p0420 all this read the catalytic converter is most likely worn out. This Definition of P0411 is :Secondary Air Injection System Incorrect Flow Detected What does ...

...CODE P0420(UPSTREAM CATALYTIC CONVERTER EFFICIENCY BELOW THRESHOLD) I guess one would come to the conclusion you need to replace the upstream O2 sensor. Buy one at a parts store and take it to a ...

...Code P0420. Things I've tried before I found the error code: replaced the spark plugs (porcelain on one was cracked) and the coil-to-plug boots; I've also removed the Air Temp sensor and cleaned it ...

...p0420 It is pointing to a bad catilatic converter, as well as possibly, 02 sensor. Hope this help you, thanks. Mike from fixya Hello: PO420 means the catalytic converter is below proper emission ...

...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 ...

...code (DTC) P0420 "Catalyst System Efficiency Below Threshold" is one possible outcome following the Catalytic Converter Monitor (test). This monitor is one of the last tests to be performed by the ...