Question about 2002 Nissan Altima

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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?

Mechanic said catalytic converter is plugged and the engine needs replaced.

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  • 232 Answers

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?

Posted on May 31, 2009

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Replaced catalytic converter about a thousand miles ago and now I get code P0420. What could cause this.


P0420 indicates the catalytic converter is working at reduced efficiency. Catalytic converters are designed to last for a long time if nothing gets into them to destroy or degrade the metals used as catalysts. When a converter is replaced, the engine should be thoroughly checked for proper operation (something caused the old converter to deteriorate). Ensure that no 'junk' is being introduced into the exhaust that might damage the converter. Things like coolant, excessive fuel, and anything else that might contaminate the exhaust. Engine coolant (head gasket leaking), too much fuel (leaking injectors), and additives not recommended by the manufacturer should be eliminated before installing a new converter.

Nov 25, 2016 | Cars & Trucks

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Cylinder #1 with low compression


White smoke out of the exhaust means a coolant leak in the engine. When you accellerate hard and get that it could be the head gasket is leaking. The bad thing is that coolant leaks can ruin the catalytic converter too. You are looking at several thousand in repair bills.

Mar 01, 2014 | Hyundai Cars & Trucks

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Oil leak


This is a big problem, you have to stop using the car. It should not even just sit on idling. Since oil is everywhere your engine is short on oil, if you run it long enough, your engine might seize, i.e. you'll need a new engine.

Hopefully it was due to someone who failed to properly seat the dipstick or the filler cap. Are there any main leaks from the oil pump's hoses? Can you locate the source of the leak? The remaining possibilities are bad and very expensive to fix. This means there is something seriously wrong with your engine. The best possible outcome is to replace the head gasket, if it is leaking out of the head. However, leaking from there should not make it go all over the engine. It would take some time to get all over the engine.

What ever you do, DO NOT START YOUR CAR UP. You'll even have to tow it to mechanic unless you can get the mechanic to get to you.

Feb 05, 2014 | 2002 Toyota Camry

1 Answer

Po4022


That code deals with the catalytic converter. You might need to replace it or to fix another problem. Let me ask you, is it using a lot of oil? Or, is there oil in your antifreeze or a foamy look to your oil? If so, you may have internal engine damage that is causing the increased emmissions and is, in turn, causing the check engine light. If not, you may need a new catalytic converter.

Also, is this the only code, or is there another code that indicates engine misfires? If so, it is possible that these damaged the catalytic converter and will need to be fixed along with the cat.

Nov 15, 2011 | Cars & Trucks

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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...


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.

Apr 07, 2011 | Nissan Altima Cars & Trucks

1 Answer

I have 2002 Camry Le 4 cy.I was told that I need replace front pipe assembly & gasket (flex-pipe leaking) they said it would coast around 900 just for the part because there is catalytic con. but they...


The broken flex pipe can easily be fixed with a generic flex pipe for less then $100.
The catalytic converter is after that, so has nothing at all to do with it.
But cracks can also brazed or welded to fix.
However, the reason flex pipes break is from excessive engine movement.
That almost always means a loose bushing on a motor mount.
So do that first.
Should be less then $50.
Never take a car to a dealer unless you absolutely have to.
They charge twice what it should cost, because they want to sell new cars, not fix older ones.

Jan 30, 2011 | 1996 Toyota Camry

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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.

Dec 03, 2010 | 2002 Nissan Sentra

1 Answer

A week ago my 2003 CRV suddenly had the check engine light on, then stalled at stops on the way home. I took it to a Honda dealer who ran the codes. I was told the oil was low (1300 miles after the last...


THAT PARTICULAR CODE IS CAUSED BY A CATALYTIC CONVERTER DEFECT. YOUR OIL BEING LOW SOUNDS MORE LIKE IT COULD BUT MAY NOT POSSIBLY BE YOUR STALLING PROBLEM. IF THE CAT IS STARTING TO GET CLOGGED U WILL START TO GET STALLING MORE ON THE ACCELERATOR THEN OFF. YOUR BACKPRESSURE FROM THE ENGINE NEEDS TO BE CHECKED. THEY SHOULD HAVE NEVER LET U TAKE THE VEHICLE HOME WITHOUT FINDING THE SOURCE OF YOUR OIL LEAK. THE ONLY FLUID ON THIS EARTH THAT DISAPPEARS OVER TIME IS WATER. YOUR OIL IS GOING SOMEWHERE AND IT NEEDS TO BE FIXED. SORRY TO SAY BUT U HAVE MORE THAN ONE PROBLEM. THE CATALYTIC CONVERTER ISSUE NEEDS TO BE FIXED AND YOUR OIL LEAK FOUND. SOME OF THESE DEALERS ARE CROOKS. IF YOUR CAR IS STILL STALLING ALWAYS TRY TO GO BASIC FIRST SOME OF THE SIMPLEST THINGS COULD BE CAUSING YOUR STALLING.

Sep 11, 2010 | 2003 Honda CR-V

2 Answers

Where is the catalyst converter located


In the exhaust line...
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DTC P0420: 1/1 CATALYTIC CONVERTER EFFICIENCY
NOTE:For component location, see COMPONENT LOCATIONS . For connector identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform POWERTRAIN VERIFICATION TEST VER-5 under VERIFICATION TESTS to ensure system is functioning properly.

Monitored & Set Conditions
Catalytic converter efficiency is monitored after engine warms up to 158°F (70°C), throttle has been open for 180 seconds at vehicle speed more than 18 MPH, with engine speed at 1200-1700 RPM and MAP vacuum 15-21 in. Hg. DTC will set in Powertrain Control Module (PCM) memory when PCM senses catalyst efficiency deteriorated to a predetermined value. Possible causes for DTC to set are: intermittent condition, exhaust leak, engine mechanical problem, defective catalytic converter or upstream Heated Oxygen Sensor (HO2S) is older than downstream HO2S.
Testing
NOTE:1/1 HO2S may also be referred to as an upstream oxygen sensor. On 2.4L, 1/1 HO2S is located on exhaust manifold flange. On 3.3L and 3.8L, 1/1 HO2S is located on right exhaust manifold flange (manifold closest to firewall).

NOTE:If any O2 sensor DTCs are set along with P0420, diagnose those DTCs before continuing with this test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .

Turn ignition on. Using scan tool, read DTCs. If Good Trip counter is displayed for DTC P0420 and displayed count is "0", go to next step. If Good Trip counter is not displayed for DTC P0420 or displayed count is not "0", go to step 7 .
Inspect catalytic converter for damage, discoloration caused by overheating and for converter coming apart internally. Replace catalytic converter as necessary. If catalytic converter is okay, go to next step.
Start engine and allow it to idle. Check for exhaust leaks between engine and 1/1 HO2S. Repair exhaust system as necessary. If exhaust system is okay, go to next step.
Check exhaust for excessive smoke caused by coolant entering combustion chambers or high oil consumption. If excessive smoke caused by coolant entering combustion chambers or high oil consumption does not exist, go to next step. If excessive smoke caused by coolant entering combustion chambers or high oil consumption exists, repair engine as necessary and replace catalytic converter.
NOTE:A new downstream HO2S used along with an aging upstream HO2S may cause DTC P0420 to set.

If downstream HO2S has been replaced without replacing upstream HO2S, replace upstream HO2S. If downstream HO2S has not been replaced recently or downstream HO2S has been replaced along with upstream HO2S, go to next step.
At this time, catalytic converter is assumed to be defective. Replace catalytic converter.
NOTE:A new downstream HO2S used along with an aging upstream HO2S may cause DTC P0420 to set. Review vehicle repair history and repair as necessary.

Conditions for DTC to set do not exist or fault is an intermittent problem. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Using scan tool, monitor parameters related to DTC while wiggling connectors and wiring harness. If value changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused value to change. If value does not change, review Freeze Frame data using scan tool. Attempt to duplicate condition that caused DTC to set. Check for any related technical service bulletins that may apply. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. If no problems are indicated, test is complete.

Good luck.

Oct 14, 2009 | 2000 Chrysler Town & Country

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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