Question about 2001 Toyota Sienna

3 Answers

Want to change the O sensors

The check engine light has code P0420

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  • laogreentea May 18, 2009

    Yes, I need to change the O sensors on my van, and would like to know what kind do I need? Are they Bosh # BS 13540 and rear sensor # 13566? Or do I need Denso WO 135-1607357? And are there tree O sensors or Just two? And is this a hard to do yourself job or do I need a shop to install them? I heard there is one that connects from under the passenger seat as is very hard to get too.
    I had the computor readout with code #P0420 Catalyst System Efficiency below threshold, does this usually mean the Oxygen sensors are bad? Please help as I am currently living in Laos and I may have to order from Thailand or have my frien in USA buy them and send to me.
    Thank You
    Gary


  • Keith Heavilin
    Keith Heavilin May 11, 2010

    Can you please clarify what you need help with?

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I would definitely go with the Bosch brand and there are only two oxygen sensors.  One before and one after the catalytic converter.  As far as how hard they are to change out I don't know on your particular vehicle.  Here in the states you can borrow a tool from your auto parts store to help you take it out but I don't know if that would be available to you.  I just did the sensors in my father's Isuzu Trooper with a 22 mm wrench.  If you can get access to them, they are easy to change.  Just unscrew and screw them back in.  

Posted on May 18, 2009

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I have a 2004 Nissan Altima 2.5 s with about 150k. I bought the car 4 years ago from a dealership. They sold me the car with a bad cat. W.E i bitched about it a while and then just ended up changing it last year. The sparks were done a few months later. I know they say to change the 02 sensors when you do a cat job, but they werent bad so i was advised to just leave them alone. Now, its a year later and i start getting a p0420 code again! I am not totally convinced that it is my cat as i have not smelled anything plus it was just done. I have a feeling i might have a exhaust leak or possibly the 02's are finally going bad. Does anyone know what normal readouts for the 02 sensors should be? i had my mech quickly plug in his scanner to the car to look at the functionality of the sensors. The readouts when the car was idling were around .3V for bank 1 sensor and .8V for bank 2 sensor. I am going to send it off for a smoke test i think next to check for poss leaks. Does anyone know if a bad valve cover can cause this light to come on?

Posted on Feb 18, 2015

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Thanks for this..but can you show me the location of the fillter air conditoner for the van toyota sienna 2001 please

Posted on Oct 25, 2009

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Posted on Jan 02, 2017

dsacco86
  • 1077 Answers

SOURCE: Code P0420

P0420 Catalyst System Efficiency Below Threshold (Bank 1)

There is one 02 sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.

Possible Causes:
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter

Posted on Mar 24, 2009

  • 2039 Answers

SOURCE: check engine!

normally you need to change the converter if you have smog test you have no choise if not disconnect the battery for a minute and try it out hopefully it will not come back hope its a fixya thanks for the post pierre

Posted on Jul 31, 2008

  • 1201 Answers

SOURCE: check engine light on;engine codes p0420 and p0773

I looked up the codes you posted.
P0420 is showing a bad oxygen sensor on bank #1, the one down by the catalytic converter.
P0773 is an electrical problem with the shift solenoid E.
A bad oxygen sensor would cause lower fuel milage.

Posted on Mar 11, 2009

SOURCE: P0420 and check engine light

A p0420 code is set when the computer determines that the catalytic converter isn't doing it's job. In almost all instances that code can't set as a result of a bad o2 sensor so they probably didn't have to be replaced. The catalytic converter will need to be replaced, prefferably by an oem part. This can be pretty expensive and should be considered before purchasing the vehicle.

I have replaced a few bad converters on late model subarus in the past few years.

Posted on Apr 18, 2009

  • 1 Answer

SOURCE: Check Engine Light came on with code p0420. Dealer wants $3900 to fix "b2 manifold and front pipes. Does this make sense. Are their better alternatives. I left the dealership without fixing it and the

if u r have lexus or v 6 or v8 so change or check u r leak of exhouse bank #1 driver side if u all want any question send me mail malikume@eim.ae

Posted on Jul 25, 2009

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Read more at: https://www.obd-codes.com/p0420
Copyright OBD-Codes.com

https://www.obd-codes.com/p0420

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P0420 Catalyst System Efficiency Below Threshold (Bank 1)

There is one 02 sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.

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