2000 Subaru Outback "code po420 check engine light" Questions

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...CODE PO420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK I * CODE PO325 KNOCK SENSOR NO.1 CIRCUIT MALFUNCTION BANK NO.1 OR SINGLE SENSOR P0325 Knock Sensor Circuit Malfunction P0420 Catalyst System ...

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...so my friend put it on his computer and this code came up PO420 (BANK ONE). WHAT IS THIS CODE? see solution to similar question at ...

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code this time. I was told that it was P0420. What does that mean and why does it come and go when ever it feels like it. PO420 is for catalyst system efficiency below threshold. I have seen this many

...code P0420 (Catalytic Converter Below Efficiency Threshold). Called a few service shops today -- some said cat needs replacement while others said it could be the O2 sensors. Are there any other ...

Question about Subaru Outback

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...code po420 I have a 2000 corolla. it had the check engine light on, and trouble code "po420". i was using unleaded fuel 89. after the check engine light was triggered, i change to premium unleaded ...

Question about Subaru Outback

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...code po420 from autozone.... Does K&N air filters make check engie lights come on? I also have a 2003 pathfinder with 45k miles and I also used K&N air filter.. both of my car engine lights ...

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...code Po420 troubleshooting code PO420 In almost all cases, a P0420 code indicates a problem with 1 or more O2 sensors. They send incorrect emissions information back to the ECM and trigger the Check ...

Question about Subaru Outback

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check engine light is on i have a 98 honda accord trying to find out what these codes are, po420,po401,p1456 Go to google & type in ---OBD2 Codes 1998 honda accord PO420 etc

...code po440,po420,po441, these 3 codes are the ones scanner brings up,po440,po441,po420 P0420 is catalyst system efficiency below threshold (bank 1) P0440 is evaporative emission control system ...

Question about Subaru Outback

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CODE PO420 CHECK ENGINE LIGHT ON CODE READ PO420 most of the time its the sensor that cause this,id try replacing the sensor on it,that usually fixes that code,but you have to get the code cleared off

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