B1421 onl

Hello Everyone. I just bought my first prius, it's 2005 Toyota Prius (192000). A day after i bought the car (private sale from criagslist) the red triangle poped with check engine light. took it to a local mechanic he ran the code and told me the engine was misfiring and replaced the spark plugs and coil, changed the oil & filter ($265). the check engine light went away but red triangle stayed, I have a bluedriver OBD II scanner. I got multiple error codes like C2300, C2318, C1241, U0123, U0124, and B1421. I searched on this forum and read multiple threads stating it's usually due to the 12v batt. I ran the car batt diagnostics and it displayed 11.9v, so today i had the battery changed at pep boys. Got the bosch-premium-performance-battery-group-size-51 All the codes have disappeared except the B1421, granted i ran the code when it was dark(ish) outside. however there's still that red triangle on the dash board there. I am not sure what could be wrong. Any advise or guidance would be much appreciated. Thank you

 

just an update: I ran the scan again this morning the error is still present, is this error know to cause the red triangle?

 

I am using Bluedriver OBD II Scan tool

I am able to clear the codes temporarily, and when I scanned this morning the 1421 was replaced with B1400 instead. I can look into getting a techstream, I will report back if it reads some thing bluedriver was unable to.