My 2002 Sienna has had the intermittent cat efficiency failure off and on (well, I said intermittent, heh, heh) over the years. In the past, I have posted on this topic, and smart folks here said there was new software which solved this problem in many cases.
I asked Toyota in Pharr a couple years ago about flashing it to the new engine computer version. The service writer told me I would need a new computer and it would cost $800, which I believe is considerably more than flashing would cost.
I just looked up the Service Bulletins for that car, and found TSB-0064-10 which says as follows:
Service Bulletin No.: TSB-0064-10
Component(s): ENGINE AND ENGINE COOLING
NHTSA ID Number: 10034284
All Products Associated with this Service Bulletin expand
0 Associated Documents
Manufacturer: Toyota Motor Corporation
TOYOTA: TECHSTREAM ECU FLASH REPROGRAMMING PROCEDURE. FLASH REPROGRAMMING ALLOWS THE ECU SOFTWARE TO BE UPDATED WITHOUT REPLACING THE ECU. FLASH CALIBRATION UPDATES FOR SPECIFIC VEHICLE MODELS/ECUS ARE RELEASED AS FIELD-FIX PROCEDURES DESCRIBED IN INDIVIDUAL SERVICE BULLETINS. MODEL YEARS FROM 2001-2011. *PE
Another page said it was implemented in 2010. And, the ‘All products’ on this page said the SB covers Sienna 2001 through 2011.
Do I read this correctly? If so, I want to take it in and have it flashed to solve this problem. But, if I am reading it wrong I don’t want to look stupid.