Question about 2005 Subaru Legacy 2.5i
I have recently found that my car is sounding like one of the cylinders has a problem (when reving sounds like a stick in the spokes of a bike followed by a popping noise) i checked and the oil was deathly low so I filled it and still no change. My friend thought one of the "leavers" are prob. stuck so I take it to get the code scanned.... I am recieving a few codes.... 1. lCat effeciency below threshold- which i was told was prob a cat or my O2 sensor cat was just done so not that hopefully 2 another was cylinder misfire and 3. vechile speed sensor can someone help me before my wife and I loose our mind!?!
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Posted on Jan 02, 2017
What you should check first is the spark plug for the #1 cylinder and see if there is a white film on it this would be a sign of a coolant leak which would cause a problem with the O2 sensor
Posted on Oct 11, 2008
I do not know for sure if this is the problem you are having, But, I have noticed that from 95 up to 2002 I have seen a lot of PO420 codes that have been just the sensor. I do not know if it was a weak sensor or just that program telling it that it is below threshold. I did notice that if the vehicles are run for a long trip at highway speed it goes out. I wish you luck and have a great day.
Posted on Feb 11, 2010
Tips for a great answer:
Bad miss at idle?
While stop engine idles like cylinder missing?
Engine Misfire codes for car?
Engine Misfire codes?
Misfire on cylinder 4?
Oil on spark plugs and car misfires?
This will help.
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