OBD-II B1421 error Codes,PLS ADVICE.

[gti-wly]

fyi.. the error might refer to this solar sensor..

 

[wfhan]

fyi.. the error might refer to this solar sensor..

solar sensor.. it captures cabin temperature input to climax/air-con system,
and use it to auto-adjust the a/c's fan-speed in 'auto' mode ?

 

[santa_cruzze]

hi...up!!!....i know this old post...but suddenly my CEL came on while driving..the CEL stays around 5-15 seconds then off..so i took the car for diagnostic..only 1 error code found, it's the a/c solar sensor passenger side..fyi,i just did the timing belt replacement the day before..then this CEL came up...never happen b4 the timing belt change..is it related?....but the a/c still work & still cold..any ideas?