Question about 2002 Subaru Outback
I have a 2005 outback wagon. A few weeks ago I had the check engine light come on and had the code scanned and was given a long list of things that it could be. The code was reset and I drove about 500 miles and the light came on again. I drove about 50 more miles and the light went off on its own. It stayed off for 3 days and came back on tonight. I had it scanned and asked for the 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 times on vehicles from 96 up. It is due to the system not burning the fuel at what it considers an acceptable rate. Todays fuels are not the best we could have for internal combustion and sometimes it will set off the light. I tell my wife she is too easy on the car and it's not burning the fuel proper. After a couple days it goes out. It will not harm your engine and should go out again. Fuel system cleaning additive will also turn of light. Good luck and enjoy your Subbie. Greatest car ever Built.
Posted on Jan 31, 2009
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Posted on Jan 02, 2017
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