Join Date: Nov 2008
Location: Upstae NY
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanked 0 Times in 0 Posts
iTrader: 0 reviews
Error P0420 vacuum leak?
Okay, so my check engine light came on at 128000 miles in my 2001 Altima. The car has been running like a champ despite some unrelated suspension issues.
The error code I get is a P0420 Catalyst system efficiency below threshold.
The car has been burning a little bit of oil and at the time I checked it was actually about 1/8 quart over which I could probably attribute to expansion due to heat. Other than that I haven't noticed any rotten egg smell from the tail pipe and everything seems to be running correctly.
The probable cause here says.
Large Vacuum Leak
Fuel System Fault
Ignition System Fault
Failed Bank 1 Catalytic Converter
I am limited in knowledge but can handle everything but the vacuum leak.
#1) Where are ALL the vacuum lines to check
#2) How do I check them
#3) If leak is found how do I replace them
I have the Nissan factory manual, the good one for mechanics, but can't seem to find where the vacuum lines are,
Any help is greatly appreciated.