Question about 1996 Saturn SL
I ASKED THE QUESTION ABOUT MY 1996 SATURN AND YOU JUSST REPLIED ASKING ME A BUNCH OF QUESTIONS...
THE CODE IS P0420
YES, THE CHCK ENGINE LIGHT IS ON
Ok knowing the code is what its all about..- code 0420 is
"Catalyst efficiency below threshold"
This indicates that the oxgygen sensor downstream from the cat is sensing high levels of oxygen after the cat. The catalyst is supposed to use all the oxygen to catalyse the nasty **** in your exhaust. A high level downstream from the cat indicates either the cat needs to be replace (MOST LIKELY) or you have a faulty sensor.
A faulty sensor would bring up other codes on your scan too, so I am afraid a new Catalyst is likely the fix. They last about 120-150K miles so if you're in that range there ya go....
hope that gets it for you...pls rate me if you get a mo.
Posted on Jan 11, 2009
Tips for a great answer:
Trouble Code: P0420
Catalyst System Low Efficiency (Bank 1)
Air leaks at the exhaust manifold or in the exhaust pipes Base engine problems (i.e., high engine oil or coolant usage.) Catalytic converter is damaged, contaminated or it has failed. Continuous engine misfire conditions, or weak or low coil output. Front HO2S or rear HO2S is contaminated with fuel or moisture. Rear HO2S is loose in the mounting hole (check it for a leak). Front HO2S older (aged) than the rear HO2S (HO2S-12 is lazy) .Here is what is listed in the Saturn repair guide.
Aug 29, 2012 | Cars & Trucks
Jan 07, 2011 | 2002 Isuzu Axiom
Nov 03, 2010 | 1999 Saturn SL
Dec 13, 2009 | 2001 Saturn L-Series
Nov 14, 2008 | 1996 Lexus LX 450
500 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: