is it common for a speed sensor to go bad in a '00 B16a2? was driving on freeway and downshifted to 4th and floored it...after i was cruising interior lights got dim and CEL went on...got home and checked codes...was code 1, 17, and 21..reset ECU and only code 17 (speed sensor) keeps coming back...speedo wont work, and when cel for speed sensor is on, vtec dont kick in...also my alternator took a ****, and drained my battery...i know this because i replaced battery 2 days ago and car died on me yesterday...interior lights were dimming car got weak and radion turned off and eventually no electrical power at all...even when i turned on my hazards they got dimmer and slower and would flicker. i had to turn them off for a while, then turn on again............so im replacing alternator and battery, but not sure if i should replace speed sensor...i didnt realize how important the alternator really is...till now

 

on my b16a2 swap, the speed sensor works sometimes and sometimes it dosent, but ive never noticed that vtec dosent kick in?

 

a bad altenator will cause some sensors to indicate incorrect voltages which can cause CELs. its pretty common. try replacing the alternator and resetting the ECU. i bet all ur codes will go away

 

You my friend have a busted alternator fuse!!
15amp
go change it


i learned the hard way.. dont ask..

 

under the dash fuse btw

 

on my vss plug 2 of the 3 wires from the plug that connects to the vss kept coming lose from the top of the plug ill check that if I were you, and look at the vss and check for corosion

 

you might want to check the tension of the alt. belt. if its too loose then you wont get the proper voltage. in hence not getting the 12 volts to the vtec solenoid so that could be why your not hitting vtec sometimes

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMlifestyle &raquo;</TD></TR><TR><TD CLASS="quote">you might want to check the tension of the alt. belt. if its too loose then you wont get the proper voltage. in hence not getting the 12 volts to the vtec solenoid so that could be why your not hitting vtec sometimes</TD></TR></TABLE>

his vtec isnt working because of his vss

 

i was just about to say that
seriously. check the fuse first. i took out the alternator. bought a new one. put the new one in and still the same problem..

i then checked the fuse.. bamn. blown. i had all the same codes and symtoms. if your vss is hooked up, id be willing to almost gaurantee its the fuse.

 

What if its not the fuse?