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We have a 2001 Rav4 that since the check engine light came on it started hesitating on exceleration from a stop. The ECU was recalibrated to cure the check engine light along with repalcement of Oxygen, air fuel sensor and idle air control sensor. Since I have taken in the Rav 4 times for the same problem and when they run diagnostics they cant find anything wrong and the hesitation problem is intermittent and now has died out a couple of times on acceleration but starts up with no problem. also hesitates when deceleration then when trying to acclerate it will hesitate
Any ideas? HELP NEEDED!!!! they cant figure out whats wrong at the dealership
 

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RAV4 ECU Software Upgrade

Try this at your dealer:

TSB #EG01002 -- SUBJECT REGARDING ENGINE CONTROL MODULE (ECM) CALIBRATION UPDATE - MALFUNCTION INDICATOR LIGHT ON WITH DIAGNOSTIC TROUBLE CODES P0420 OR P0430 AND ENHANCED ENGINE PERFORMANCE. *TT (NHTSA ID #634045, APRIL 12 2002)

See my post of 3 Jan 2007 regarding this in this forum.
 
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