Question about Nissan Altima

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2002 Nissan Altima consumes oil. I've replaced (approx 1 yr ago) the catalytic converters (new) and used engine; however, still consuming oil (1-2 quarts every other week). Check engine light on again with readings for catalytic converters...why am I still having the same problems even after I've had this work done?

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The used engine that you bought was previously damaged by the disintegrating cats that were on the car that it came from and because it was burning oil badly when you installed the new cats, it ruined the new cats with the oil that was coming out of it. You'll need a re-manufactured engine, not a used one, they are all bad, and new cats again. Bad news I know. but likely the problem.

Posted on Apr 07, 2011

Testimonial: "Bad news...yes! But at least I know where I stand. It just sucks that Nissan refuses to do anything about an issue that so many people are having. thx"

  • Dave  C
    Dave C Apr 09, 2011

    I've heard that Nissan did cover this problem to some extent, there is a service bulletin regarding the cats, but I'm afraid too much time has passed by now.

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The engine light in my car came on about 2 and a half weeks ago. I brought it to the mechanic for a diagnostic test and they said that my catalytic converter needs to be replaced. My engine has been...


Your car does in fact need a new catalytic converter. And it should also not burn a drop of oil. It can burn oil as it seeps past leaking intake valves and piston rings.

I highly recommend you do not even start the engine again until the exhaust and intake valves have been inspected and replaced as needed, it has a new catalytic converter and a complete tune up.

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Pray.
Just kidding. Take it back to the dealership and demand that they find out what the check engine light is for. They may have just put the catalytic converter on wrong.

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You will need to get the emissions tested to see if maybe if you have problem there. Being an 02 its possible the cataytic converter failed and is restricting the exhaust. One thing is we never replace a catalytic converter without first making sure the engine is running properly. All it takes is a few days of driving with an emission issue to waste a brand new cat.

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Your 02 sensor is located on your exhaust system coming off of your engine. It will be threaded into your exhaust pipe. There should be two you your car. One before the catalytic converter and also one after. You will have to get under the car to replace them. Note: These can often be difficult to get out. Spray penetrating oil wd-40 or something simular by the threads to help on taking them out. Make sure you do not get any oil on the new sensor.

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Check your muffler, is it thick black? The engine is burning oil, you need new engine if the cylinder ring is bad (compression test), and new catalytic converter that poisoned by excessive oil.

Many altima 02 has pre-catalytic converter failure that cover under 8 years/80k miles emission law. The materials in the pre-cat destroy the engine. It is well known problem and you can get new engine under this warranty

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Change the piston rings sets of each piston and if the vehicle has been running for 5 yrs or crossed 50,000 miles then u might need to to replace with 1-oversize rings, filed properly by the mechanic.......................sodeep

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1 Answer

Engine using oil. No sign of leaking. Catalytic converter replaced 13 months ago, now needs replaced. Told need new engine. What is causing the catalylic converter to plug?


Was a leak down test performed on the motor?This will determine if the oil loss is due to bad rings or a head gasket.A head gasket can be repaired,rings will require an overhaul or new motor.Have checked the coolant for oil contamination?

May 31, 2009 | 2002 Nissan Altima

1 Answer

2002 Altima engine/Catalytic converter problems


check engine light has nothing to do with oil level. Only the red engine light does. It sounds like you are burning a lot of oil and it is poisoning your catalytic converter. Your converter is killing itself trying to treat all the unburned oil that is coming to it. It will get so hot that it swells inside and clogs it up. Why you are burning oil is the question. Only 3 possibilities. Past the piston rings, past the valve stem seals or a plugged pvc valve and its hoses. Clean the PVC hose and change the PCV first. Changing the cats now will just kill them again until you fix the oil burning.
Autozone will do free scan test for fault codes by the way.
PCV won't show up there though.
You can buy cheap engine on ebay or at car-part.com. page with asterisk is lowest price.

May 29, 2009 | 2002 Nissan Altima

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