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"The P1121 code is very common and Toyota issued a Technical Service Bulletin and a new updated part. The new part # XXXXX correct/fix this concern is 16670-21010 Coolant Flow Control Valve and the TSB # XXXXX XXXXX The labor time is 2.1 hours and please check with the Local Dealer as to Parts Price--they will vary by area of the country and Dealer markup.".
Link to TSB eg001-08: http://engine-codes.com/uploads/toyota/EG001-08.pdf
"The P1150 code indicates a clogged coolant path for the heat storage system. We have never seen a clogged system and this code is just a byproduct of the first P1121 code. Basically the system doesn't 'see' the coolant flowing and sets these codes. In other words ... the coolant isn't moving. That is what sets both codes and not because the system is clogged. Trust me, it's not clogged.".
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