Question about 2002 Toyota Sienna

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THE CHECK ENGINE LIGHT ON MY MINIVAN 02 SIENNA IS ON, AFTER I TOOK IT TO AUTO ZONE I WAS TOLD THAT IT COULD BE THE O2 SENSOR, CODE PO420 , CATALYST EFFICIENCY LOW BANK 1. BUT THEY WERE NOT SURE WICH ONE IT COULD BE, HOWEVERE I WOULD LIKE TO GET ANOTHER OPINION BEFORE I SPEND ANY MONEY GUESSING. THANKS...

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  • Dennis Boxerman May 11, 2010

    Let me suggest that you run a tank or two of premium fuel. If the light goes out, you may have been used a low grade, "Cheap" fuel. This could "Trip" the sensor. It's worth a try before you go changing parts that may not need changing. Remember, sensors,"Sense" things and it may be trying to tell you about the fuel. Check you owners manual, if you still have it, and see what octane fuel you should be using. Also, buy fuel from places that stand behind their products.



    Good Luck

  • mike loshbough
    mike loshbough May 11, 2010

    this would be your catalytic converter insides going bad

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The FIRST thing that I would do would to get some really good fuel injection cleaner introduced into the fuel. Go and find some BG 44-K. This is the BEST stuff available. Fill up the tank, and dump in the BG 44K, Run the tank down as fast as possible. I use the BG product in my shop; it really works. Don't buy a Cat until you try the BG.

Posted on Mar 04, 2009

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2 Answers

There's a new answer to your Jeep 2008 Patriot question! Author image Bogdan Odwazny wrote: The code is po420? This was your reply to my first question some time ago. The answer is YES the c


EOBD II Error Code: P0420
Description:
Catalytic Converter System, Bank 1 - Efficiency Below Threshold
Possible Causes:
- Leakage in Intake and/or Exhaust System.
- Catalyst faulty.
- Oxygen Sensor(s) faulty.
- Oxygen Sensor(s) Control faulty.

Solutions:
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- Check Catalyst.
- Check Oxygen Sensor(s).
- Check Oxygen Sensor(s) Control.
- Perform Oxygen Sensor(s) Aging Check.
Hope that works.

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I took my car to jiffy lube, 2004 dogde stratus, 2.4 l , to get my 02 sensor replaced. Now my ingine light is on the code was PO420. I wonder now if he kept my new sensor and never replaced it with the new...


Alot of times an in effective catalyst code and an O2 sensor code can be set from an engine vacuum leak. Engine sensors can not see a vacuum leak, but they can tell when an engine is running lean and associate it with the emission system. My suggestion is to have your mechanic look for a bad vacuum hose or elbow.

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Catalyst system efficiency below threshold


is that the code you get from comp is PO420 eng light if so worst news either you have an exh leak between o2 sensor 1 and o2 sensor 2 or the front o2 sensor is lazy or the front catyletic converter is not working

basicaly code is only triggerd when engine is hot and the front o2 sensor and the rear o2 sensor read the same voltage when conv is working the front o2 sensor will fluctuate rapidly from 0v to 1v and rear o2 sensor will remain steady at 0.5v

try to explain best i can plz vote comment or reply if you need more help

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Thank you for using fixya and note that Auto Zone and most larger auto parts store will scan DTC codes free of charge.

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P0420=Catalyst System Efficiency Below Threshold Bank 1,
The air filter is not the cause here,this is just a code saying your converter is not doing its best,

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Huge problems with these cars. The Pre-cat converter is built into the exhaust manifold. Expensive to replace. No Recall on this item. Some say that inferior compounds in the catalyst cause corrosion and early wear of the piston rings. I have seen one of these use 5 qts of oil in 300 miles. Is this car using excess oil?

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make sure that O2 sensors are good if access to scanner look at live data and if both O2 sensors are switching about the same the catalitic convertor should be replaced

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If the code has cleared on its own then you need to disconnect the battery and re-connect it. This will clear the codes out of the memory. If you don't want to do this you can go to an auto parts strore and have them hook the little computer up to your car and they can clear out the code as well.

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