Lemon - 3 deteriorating cat converters destroyed 2 engines
Have a V-6 (3.5SE) 2002 Altima bought certified from dealer in 11/2004 with 54k miles. Had moved from PA to NJ, and I suspect the original owner may have noted oil burn and got rid of it.
Cat converter (bank 2) deteriorated and destroyed the engine at 67K - probably well before, but took a while to detect. Abrasive cat particles got in engine and destroyed seals. Engine and Cat (B2) replaced under 100k certified warranty. At 99k Cat (Bank1) deteriorated and since over 80k had to pay. My guess was that this was already destroying the engine and lucky if I got 110-120k on it.
At 112k, sure enough Bank2 cat has again deteriorated and the engine is likely toast again (profusely burning oil again). Despite the warranty being up, I'm asking Nissan for resolution because this has got to be something wrong with this car. Dealer says this is fairly common with 4 cylinder, but not a 6.
My advice to anyone with an Altima cat deterioration requiring engine replacement covered by warranty: Don't be too happy about the free engine - it may happen again.
LEMON - hope I get satisfaction from Nissan and the dealer.
Would you buy another car from this manufacturer? No
Review Date: 21st March, 2008