Question about 2001 Toyota Sienna

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Engine code P0420

If I order a replacment part and install it myself. Does the new ECM need to be flashed??

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  • Toyota Master
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What a great loaded question, 3L V6 and Camry based car.

CE, LE, or XLE?

in USA?

what new PCM.? what parts changed, list all parts.

the FSM covers this. read it. (extensive it is)



you said new ECM(pcm), well is that from Toyota? or whom.?????

i sure cant guess your PCM source, there are many.

used, new TOY,rebuilt and aftermarket new.



the factory PCM on most cars are slicked, and must be flashed

to your options. and model, in fact this is a top goal of all car makers

1 ECU and fits 100 cars. a dream that is working.....

on a 2001 , well let see.



on line

Federal car or Calif car. 2 ECMs. in usa. (it dont mention flashing)

ouch $700 part.

are you sure its bad, most are, did you know about 85% sent in

are good
, owners out $700 .?



https://parts.olathetoyota.com/2001toyotasiennaparts.html



got the IMMO option, if yes, it will never run.

immoblizer. RTM read the FSM manual;. its all there.





point 2, and best of all ,why not join a real forum

and get help from folks that deal with all this.



The IMMO rules on most toyotas are the strictist of all cars.

never ever lose the master key or use it for daily use.



now back to the Blue box. P0420

the ECM is not bad for this..

it means the CAT is weak. (or dead)

THE PCM monitors the CAT with a rear 02 sensor

this sensor loose like line, drawn by a drunk man. tiny jiggles

about 0.5v.

if the cat is bad this sensor B1S2 or B2S2, (do you have 2 sensor 2\'s)

if this O2 jumps widely, this means the cat is bad, its not working

or

HUGE NASTY SMOG exiting the engine, Engine runs like crap

we fix the engine first. then drive 100mile, in closed loop and bake t

the old cat dry. reset the PCM and see of 420s stop

if not, a new 02 , and or cat.

that is how 420s work. fix 420s DEAD LAST , always.



in shops the just slam in parts, labor is too expensive

but a DIY guy can fix the engine then bake the cat.

it does work , done it many a time.

even with cat full of oil, from a blown engine.

smoked white 20 miles ,then woke up and passed all smog.



tell more, get more.

Posted on Jan 03, 2014

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