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?
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