Question about 2003 Nissan Se R
Your right as the 420 code refers to the cat, not being able to clean the exhaust your smoking problem has to be fixed to fix this code as the code is the cat can't clean up the exhaust enough. You may do an expensive oil change and see if you can reduce the smoke enough that the cat can clean the exhaust. STP or other stop smoke product and freash castrol 20-50 and even flushing the oil out with a flush additive. Then the reason the code sets is the rear cat is switching more than once in fives times of the front one. this could also happen if the car doesn't hit full operating temperture. ( middle of the gauge) the therostate may not be letting the car warm up all the way and then the fuel turns up higher and the smoke tand the inability for the engine to go into a proper closed loop. In worm summer operation the car should warm up to the middle of the gauge and stay there as you drive ( not go down as you speed up) if it does the therostate is bad and with the right one and a good oil change or two you may fix it. It's also possible that it's run too cool for too long and the only way to fix it is to rebuild the engine or get a good used one installed.
Posted on Sep 14, 2010
If there is oil consumption,this may be the problem,the o2 is sensing the oil ,and is trowing the code,this is a oil usage problem.The engine is burning engine oil.
Posted on Sep 15, 2010
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Posted on Jan 02, 2017
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