Question about 2002 Nissan Altima

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2002 Altima engine/Catalytic converter problems

I have an 02 Nissan Altima. 13 months ago I had to replace the ECM, 02 sensor, and the headlights. I take it in for the normal oil changes and have not had any problems, until now. 4 weeks after my regular oil change the check engine light came on and I checked the oil and found there was no oil, so I added 3 quarts in and it seemed fine. 1 week later I had to add 2 more quarts. I took it to my mechanic and he told me that it has clogged the catalytic convertner, which was replaced 13 months ago. He also told me that I need a new engine, which average cost that I have found is $2,500.00-$4,000.00. Is there any way to repair this issue without a new engine?

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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 page with asterisk is lowest price.

Posted on May 29, 2009


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Posted on Jan 02, 2017

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SOURCE: catalytic converter

it would be very hard. you may need a professional to do that.

it is in line with your exhaust system. it is a piece of metal just like a muffler but a little bit smaller and it is located between the engine and the muffler. you will need to cut that piece and weld back a new one on your exhaust pipes which would require you to use acetyline torches.

be carefull if you would DIY.

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Posted on Aug 26, 2008

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SOURCE: catalytic converter question

you must have a duel exuast the #2 converter is on the right center of the vehicle underneath the floor pan.

Posted on Aug 30, 2008

  • 104 Answers

SOURCE: Ml270 catalytic onvertor clogged should i cut it out

this will more than likely fail you on inspection -it must be replaced-if you do not you willget eevn less fuel mileage- also reasons for this happening are-burning marked fuel?regular gas?driving short runs all the time. Burn pump fuel-high test only-you get it back in mileage-try it - I have suv -it works- oh use a fuel addditve at least once a month to clean injector system -costs about 4 Bucks

Posted on Sep 27, 2008

  • 1 Answer

SOURCE: poor fuel mileage with my 02 nissan altima

Depending on how many miles you have on your vehicle, i would check with the dealer on that year car .. They usually warranty catalytic converters for 8yrs or 96,000 miles . Its worth checking if it gives you a free replacement..

Posted on Feb 22, 2009

  • 133 Answers

SOURCE: Replace muffler, not the catalytic converter which started to rattle. Stop running, will crank but will not start. can it be the catalytic converter.

if the converter is rattlin then it needs to be replaced because the element inside is broken. if the jeep still does not run try removing the catalytic converter to see if the restriction is too much. should start if the converter is restricted. if it doesnt maybe its whatever caused the converter to go bad in the first place

Posted on May 28, 2009

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Altima code 507

507 is a catalytic converter code that the computer throws when the oxygen level is below 95% of max. Altima's don't generally have that issue so i would lean more towards an 02 sensor. usually its the upper 02 sensor. start there.

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Check engine light on. took the car to auto zone to put it on a scanner. trouble code p0420. catalyst system efficiency below threshold. probable cause; large vaccum leak, fuel system fault, ignition...

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1 Answer

Car shuts down after it hits 75 but it never use to do that

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.

Dec 22, 2009 | 2002 Nissan Altima

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Receiving engine code p0420 on my 2005 altima 2.5 s

A p0420 code indicates a Catalytic System efficiency failure, Bank 1.
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There may be a few root causes, such as a faulty oxygen sensor, faulty coolant temperature sensor, faulty converter, Large exhaust leak, or retarded (slow) timing.

Nov 30, 2009 | 2005 Nissan Altima

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I want to change the o2 sensor on a 2002 2.5 altima, where is it located at in the engine so that I can do it. Thanks

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.

Oct 29, 2009 | 2002 Nissan Altima

1 Answer

2002 altima burns oil about a quart every 300 miles. I Just got this car engine is very clean . I had oil changed and they talked me into haveing an oil flush ran through the engine with the oil change....

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

Oct 24, 2009 | 2002 Nissan Altima

5 Answers

Nizzan 02 Black smoke coming out tailpipe and consumption of oil

Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor. Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil.

Aug 13, 2009 | 2002 Nissan Altima

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

2 Answers

Poor fuel mileage with my 02 nissan altima

yes it very possible because the catalytic converter is part of the emissions and you need to ask yourself when was the last time you had a good tuneup drive belt,sparks and wires if needed and a fuel filter and a pvc valve.

Feb 08, 2009 | 2005 Nissan Altima

2 Answers

Poor fuel economay, fuel mixture to rich

the upstream sensor is the probable cause (ahead of catalytic converter)

Aug 05, 2008 | 2002 Nissan Altima

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