2006 Quest P0420 code
110

Asked by aq_nissan Dec 24, 2016 at 06:05 PM about the 2006 Nissan Quest 3.5 S Special Edition

Question type: Maintenance & Repair

My 2006 Quest started showing the SES (Service Engine Soon) light some
days ago, took it for a code pull and got a P0420. I kept driving it for the next
few days, and this morning, when I tried to start, the engine cranks up, but
shuts down with a shuddering/cluttering sound. Even tried to keep pushing
the starter motor a bit to make it fire up, but it did'nt.

Also, yesterday when driving on the hwy at 120 kmh, I tried to push the pedal
to accelerate quickly, felt a lack of power. My wife also felt a lack of power
when driving.

Is my engine/valvetrain damaged? Should I tow it to a garage to have it
inspected? Roughly, what am I possibly looking at, in terms of damage/cost?

Appreciate your advice.

5 Answers
110

aq_nissan answered 7 years ago

Thanks Jim. Will a detailed diagnostic test help in identifying the root cause?

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110

aq_nissan answered 7 years ago

Hi Jim, I bought the Quest in 2013 with 130K kms on the odometer. I never changed spark plugs, just kept changing oil (synthetic) regularly. Also, I noticed during the last few oil changes that my mechanic (despite my concerns) poured some extra oil (more than the specified quantity) into the engine. Could these factors have contributed to the damage to the cat? Thanks.

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110

aq_nissan answered 7 years ago

Actually, I forgot to mention that I have driven it up to 185K kms now, so I suspect the old spark plugs might have been a factor. Some months ago, I used to get a subdued burning smell after a drive. Couldn't figure it out at that time.

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aq_nissan answered 7 years ago

I have also occasionally added fuel system cleaners to my gas tank, are they good or bad? Could the "cleaning" process be dumping stuff into the cat? I think the course of action now would be to have a diagnostic test done, replace plugs, cat and run it with premium fuel for some time to see how it performs. Thanks for your help. Highly appreciated.

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