P0420 slow acceleration

Asked by Feb 15, 2017 at 10:18 AM about the 2007 Nissan Altima 2.5 S

Question type: Maintenance & Repair

Code p0420 came and cleared but problem
remains that car will not accelerate when u
floor it, engine will not increase rpms, will
accelerate if u drive like grandma, was told
could be clogged converter or o2 sensor...
Does that sound right? Is either an
expensive fix? I'm very pregnant and can't
climb in/under to navigate myself, will have
to go to shop, but I don't want to get taken
advantage of.

3 Answers

87,385

It sure sounds like a plugged catalytic converter, that could have set off the code. Just have it checked out at an exhaust shop.

1 people found this helpful.
9,915

Yup, plugged catalytic converter. Just had the exact thing on a 2002 VW beetle. Replaced cad and code cleared on it's own

i had the same problem.. all it needs is a cooler for the transmission cvt oil.. it should also be under warranty

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